Yellow Star Research Articles

161 ABLATION OF EPICARDIAL VENTRICULAR TACHYCARDIA ORIGINATING IN THE AREA OF PERICARDIAL ADHESIONS INDUCED BY STEREOTACTIC RADIOABLATION IN A PATIENT WITH ISCHEMIC CARDIOMYOPATHY

Abstract This is the case of a 64-year-old male patient with prior inferior wall myocardial infarction, wearing a cardiac resynchronization therapy defibrillator and suffering from recurrent ventricular tachycardia (VT). The patient had undergone a transitory successful endocardial radiofrequency catheter ablation (RFCA) in 2013 and a stereotactic ablative body radiotherapy (SABR) in 2021, targeting the VT originating in the inferior wall myocardial scar. The patient was referred to our institution due to recurrent highly symptomatic slow-VT. A coronary angiography ruled out coronary artery disease (CAD) progression and a RFCA was rescheduled. Given the suspected epicardial origin of VT based on a 12-lead ECG, the decision was made to perform a combined epi-endocardial ablation. SABR-induced pericardial adhesions prevented posterior pericardial access, thus requiring an anterior access approach (Figure 1, Panel A, yellow star). Following epicardial and endocardial electroanatomic mapping (EAM), VT ablation relied on a substrate-based approach. Local abnormal ventricular activities (LAVAs), detected both in the accessible epicardial inferior wall of the left ventricle and at the opposite endocardial site, were eliminated by radiofrequency (RF) current. Upon completion of endocardial ablation, ventricular pacing induced hemodynamically unstable VT, exiting from the epicardial region corresponding to the SABR-induced pericardial adhesions. Mechanical adhesiolysis, using the elbow of the open-irrigated ablation catheter, was performed to disrupt SABR-induced pericardial adhesions in the inferior wall. The epicardial EAM performed with the open-irrigated catheter recorded LAVAs in the infero-posterior wall of the left ventricle, corresponding to the SABR-disrupted pericardial adhesions. A RF current was delivered, targeting LAVAs at this site (Figure 1, Panel B: the central green dot corresponds to the area of disrupted pericardial adhesions). At the end of the procedure, no sustained VT was induced by programmed ventricular stimulation. Conclusion SABR constitutes a novel and promising non-invasive radioablative treatment of VT, potentially associated with cardiac toxicity. To our knowledge, this is the first reported case of combined epicardial and endocardial RFCA of recurrent VT after SABR. Based on the first RFCA report and exclusion of CAD progression, we hypothesized that SABR might have favoured progression of the inferior low voltage area. With this case report, we would like to demonstrate that even if pericardial adhesions could be a consequence of SABR, gentle catheter-driven manoeuvres can be enough to disrupt the adhesions and to achieve full EAM. Further research is mandatory to shed light on SABR's long-term arrhythmogenic role.

The Origin and Distance of the High-velocity Cloud MI

The high-velocity, neutral hydrogen feature known as MI may be the result of a supernova that took place about 100,000 yr ago at a distance of 163 pc. Low-velocity H i data show a clear cavity, a structure indicative of regions evacuated by old exploding stars, centered on the spatial coordinates of MI, (l, b) = (165°, 65.°5). The cavity is also visible in 100 μm dust data from IRAS. The invisible companion of the yellow giant star, 56 Ursae Majoris, may be the remains of the supernova that evacuated the cavity and blasted MI itself outward at 120 km s−1. The mass and energy of MI are easily in line with what is expected from a supernova. The diffuse X-rays seen by ROSAT provide evidence of a hot cavity, and the enhanced X-rays may result from the subsequent bow shock.

Zwicky Transient Facility and Globular Clusters: Calibration of the gr-band Absolute Magnitudes for the Yellow Post-asymptotic-giant-branch Stars

We present the first absolute calibration for the yellow post-asymptotic-giant-branch (PAGB) stars in the g and r band based on time-series observations from the Zwicky Transient Facility. These absolute magnitudes were calibrated using four yellow PAGB stars (one nonvarying star and three Type II Cepheids) located in the globular clusters. We provide two calibrations of the gr-band absolute magnitudes for the yellow PAGB stars, by using an arithmetic mean and a linear regression. We demonstrate that the linear regression provides a better fit to the g-band absolute magnitudes for the yellow PAGB stars. These calibrated gr-band absolute magnitudes have a potential to be used as Population II distance indicators in the era of time-domain synoptic sky surveys.

Chemical properties of the central part of the Galactic nuclear stellar disc. Abundances in four classical Cepheids revisited

ABSTRACT This paper is a revised abundance analysis of four yellow supergiant stars Cepheids which are located in the Galactic nucleus. The results are based on the spectra secured with the help of Subaru telescope, which are of the better quality comparing to previously analysed spectra taken with the Infrared Telescope Facility. A significantly improved method of the effective temperature determination of program stars, which is based on the calibrating relations between the temperature and line depth ratios, was applied. The present results confirmed our previous finding about the solar metallicity level at the Galaxy centre. It is very likely that the four stars of our program were born from an interstellar medium having homogeneous chemical properties, since all the stars are located close to each other, have close pulsation periods, and hence the age. However, one of the stars has a somewhat increased abundance of all studied elements compared to the abundance in the other three stars. A possible reason of this fact is discussed.

A Story with Characters and Action

A Story with Characters and Action

UOCS –VIII. UV study of the open cluster NGC 2506 using ASTROSAT★

ABSTRACT We study an intermediate-age open cluster (OC) NGC 2506 using the ASTROSAT/UVIT data and other archival data. We identified 2175 cluster members using a machine learning-based algorithm, ML–MOC, on Gaia EDR3 data. Among the cluster members detected in UVIT filters, F148W, F154W, and F169M, we detect nine blue straggler stars (BSS), three yellow straggler stars (YSS), and three red clump (RC) stars. We construct multiwavelength spectral energy distributions (SEDs) of these objects to characterize them and to estimate their parameters. We discovered hot companions to three BSS, two YSS, and three RC candidates and estimated their properties. The hot companions with estimated temperatures, Teff ∼ 13250–31 000 K, are WDs of extremely low mass (ELM, ∼ 0.20 M⊙), low mass (LM, ∼ 0.20–0.40 M⊙), normal mass (∼ 0.40–0.60 M⊙), and high mass (∼ 0.8 M⊙). We suggest that systems with ELM and LM WDs as companions are formed via Case-A/Case-B mass transfer mechanism. A BSS is the likely progenitor of the high-mass WD, as a star with more than the turn-off mass of the cluster is needed to form a high-mass WD. Thus, systems with a high-mass WD are likely to be formed through merger in triple systems. We conclude that mass transfer as well as merger pathways of BSS formation are present in this cluster.

KİŞİSEL NOTLARDAN TOPLUMUN ORTAK HAFIZASINA SAVAŞ DÖNEMİ HATIRALARI: ATATÜRK’ÜN HATIRA DEFTERİ

Toplumların siyasi, sosyal ve kültürel tarihi bakımından önemli kaynaklar arasında yer alan hatıratlar, askeri tarih için de büyük önem taşır. Özellikle zaferle sonuçlanan savaşlar, toplumların hafızalarında büyük yer edinir. Anlatılan tarihi olaylar, geleceğe yönelik bir rehber vazifesi görür. Hiç şüphesiz; I. Dünya Savaşı sırasında yaşananları kaleme alanlar, hatıralar vasıtasıyla bugünü kavramak isteyenler için tarih somut birer kanıt niteliğindedir. Toplumsal hafızanın güçlenmesine vesile olan esas, yani askeri mücadele hatıraları illiyet bağını da beraberinde güçlendirmektedir. Bununla birlikte hatıratların gündelik yaşam rutininde kültürü, ideolojiyi ve kimliği ortak paydada buluşturan ve dönemi analiz yapabilmek üzere araç olan bir niteliği de bulunmaktadır.
 Mustafa Kemal Atatürk sosyal, ekonomik ve siyasal düzende köklü değişikliklere yol açan I. Dünya Savaşı’nda birçok cephede savaşmıştır. Görev aldığı cephelerde yaşadıklarını düzenli olarak not alan Atatürk’ün yazma tutkusuna 1916 yılında 16. Kolordu Komutanı olarak görev yaptığı karargâhında da şahit olunur. Söz konusu cephede, bir yandan Muş ve Bitlis’i işgalden kurtarmak üzere harekâtlar planlamış, bir yandan da milletin kaderinde dönüm noktası sayılacak olayları kaleme almıştır. Böylelikle Mustafa Kemal Atatürk’ün askerlik hayatının en parlak safhası tarihin önemli vesikaları arasında yer alan hatıralar vasıtasıyla toplumsal hafızaya kazınmıştır.
 “Atatürk’ün Hatıra Defteri” adlı eser, Mustafa Kemal’in yaveri Şükrü Tezer’in anlatımıyla vücut bulmuştur. Tezer, 28 Şubat 1916 tarihinde Edirne’ye Mustafa Kemal Paşa’nın yaverliğine atandığı andan itibaren onun yaşantısına ve askeri mücadelesine yakından şahit olmuştur. Şükrü Tezer imzalı bu eser, Kasım-Aralık 1916 tarih aralığında Mustafa Kemal Paşa’nın kaleminden kâğıtları çiçek motifli ve yaprak kenarlarında sarı yıldızlar bulunan deftere düşen anılarla zenginleşmiştir. 
 Bu çalışmada Şükrü Tezer’in Atatürk’ün Hatıra Defteri adlı eser incelenecektir. Bu inceleme aynı zamanda I. Dünya Savaşı’nın 1916 yılına ışık tutacaktır. Mustafa Kemal görevde bulunduğu bu cephede kaleme aldığı notlarda, onun düşünce dünyasını zenginleştiren kitaplara da atıf yapmıştır. Paşa’nın yazdığı notlar, tarihsel konulara duyduğu ilgi yanında edebiyat tutkusunu da yansıtmaktadır. Paşa’nın cephede yaşadıkları onu anlamak için bir rehber vazifesi görmektedir. Türk milleti için verdiği faydalı bilgiler, geleceğe aydınlatmak ve çağdaş medeniyetler seviyesine ulaşmak üzere atılan her adımda bir ışık niteliğindedir. Görev aldığı bu cephede Mustafa Kemal Paşa’nın kaleme aldığı bu notlar, aynı zamanda dönemin gidişatı hakkında analiz yapabilmek üzere milleti için temel prensipleri oluşturmuştur. Paşa’nın bu entelektüel birikimi kâğıda düşen söz konusu notlar vasıtasıyla sosyal, kültürel, askeri ve siyasi birçok konuda okuyana fikir verdiği gibi Türklük bilinç ve duygusunu da güçlendirmektedir. Askerî harekâtın planlanması ve uygulanmasının seyri içinde Mustafa Kemal Paşa’nın vazifesine olan aşkı, yaşananları kaydetme tutkusuyla birleşince incelenen bu eserin gelecek nesillere azim ve güven vereceği şüphesizdir.

Repair of pseudoaneurysm in extra-anatomic aortic arch bypass graft.

Repair of pseudoaneurysm in extra-anatomic aortic arch bypass graft.

Sisterhood in 5D

Sisterhood in 5D

Beautiful aspect of hydatid cyst

Hydatid Disease (HD) is a mild endemic disease caused by ecchinococus granulosus. It can affect any system of the body, with hepatic predilection [1,2]. Most often asymptomatic, the literature describes 5 evolutionary stages ranging from simple cysts, with it poses a problem of differential diagnosis in its simple form to complicated forms that may or may not be calcified. It is made up of three sofas; the pericyst, ectocyst, and endocyst. The CT scan plays an important role in imaging complicated hydatid cysts. The most common are rupture and superinfection. Occurring in 50 to 90% of cases, the rupture can be communicative or contained. When contained, the endocyst detaches from the pericyst appearing as a curvilinear structure or floating membranes which may subsequently calcify. This aspect is found on ultrasound, or on a CT scan [1,3]. The case on this hepatic ultrasound (Figure 1A) generated a grossly oval lesion, containing calcified serpiginous structures (floating membranes), generating shadow cones which mask the posterior reinforcement of this non-vascularized fluid mass on color Doppler (yellow star).

A Census of Above-horizontal-branch Stars in Galactic Globular Clusters*

Abstract We have carried out a search for above-horizontal-branch (AHB) stars—objects lying above the horizontal branch (HB) and blueward of the asymptotic giant branch (AGB) in the color–magnitude diagram—in 97 Galactic and seven Magellanic Cloud globular clusters (GCs). We selected AHB candidates based on photometry in the uBVI system, which is optimized for detection of low-surface-gravity stars with large Balmer jumps, in the color range −0.05 ≤ (B − V)0 ≤1.0. We then used Gaia astrometry and Gaussian-mixture modeling to confirm cluster membership and remove field interlopers. Our final catalog contains 438 AHB stars, classified and interpreted in the context of post-HB evolution as follows: (1) AHB1: 280 stars fainter than M V = −0.8, evolving redward from the blue HB (BHB) toward the base of the AGB. (2) Post-AGB (PAGB): 13 stars brighter than M V ≃ −2.75, departing from the top of the AGB and evolving rapidly blueward. (3) AHB2: 145 stars, with absolute magnitudes between those of the AHB1 and PAGB groups. This last category includes a mixture of objects leaving the extreme BHB and evolving toward the AGB, and brighter ones moving back from the AGB toward higher temperatures. Among the AHB1 stars are 59 RR Lyrae interlopers, observed by chance in our survey near maximum light. PAGB and AHB2 stars (including W Virginis Cepheids) overwhelmingly belong to GCs containing BHB stars, in accordance with predictions of post-HB evolutionary tracks. We suggest that most W Vir variables are evolving toward lower temperatures and are in their first crossings of the instability strip. Nonvariable yellow PAGB stars show promise as a Population II standard candle for distance measurement.

Effect of thidiazuron (TDZ) on delaying leaf yellowing during dry storage and postharvest quality of cut chrysanthemum (Dendranthema grandiflora tzvelve) cultivars solan shringar and yellow star

The investigations on postharvest handling of chrysanthemum (Dendranthema grandiflora Tzvelve) culivars Solan Shringar and Yellow Star were carried out at the Department of Floriculture and Landscape Architecture, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh. Studies included the effect of TDZ on reduction of leaf yellowing in dry storage of selected cultivars. Experiments were conducted in a completely randomized design (factorial). Effect of foliar spray of thiadiazuron on cut foliage successfully retained the green colour and showed maximum vase life and appearance when treated with TDZ (150 µM) and dry stored at 4ºC for 5 days than those stored for longer durations. In general, better postharvest longevity was observed in cultivar Yellow Star than Solan Shringar.

«Жёлтые звёзды»: память о Холокосте в музыкальном проекте Санкт-Петербургской филармонии

The title “Yellow Stars” was given to the annual project of the St. Petersburg Philharmonic Society devoted to the International Day of the Memory of the Victims of the Holocaust (January 27). During the six years of its existence (since 2016) it has asserted itself as a bright cultural phenomenon presented by the artistic word and highquality music. Applying the analytical method, the author of the article analyzes concert programs in which two components have been apparently indicated: the literary-musical composition with documentary or artistic verbal texts which return us to the pages of the history of the Holocaust, including separate compositions for symphony orchestra (and those with chorus and solo vocalists) which disclose the traditions of Jewish musical culture (Isaac Schwartz, Max Bruch, Dmitri Shostakovich, Mechislav Weinberg, Leonid Desyatnikov, etc.), as well as other works which reveal the spiritual theme (Giya Kancheli, Alfred Schnittke). A high-quality level of concerts has been provided by the mastery of Valery Galendeyev, the producer of the project, and by his performers: the Academic Symphony Orchestra of the Philharmonic Society (Vladimir Altshuler, conductor) and solo performers (Polina Osetinskaya, Maxim Vengerov, Julian Milkis, Ilya Gindin, Sergei Nakaryakov, etc.). Thereby, the project “Yellow Stars” asserts the significance of the memory of the tragedy of the Jewish people and projects it onto contemporary realities, where the art of music and the spoken word may become a powerful reaction to evil in its various manifestations, assertion of peace and the magnitude of human life.

Five Questions Stemming from Yellow Star, Red Star

Five Questions Stemming from Yellow Star, Red Star

Ann Marie Rasmussen, Medieval Badges: Their Wearers and Their Worlds. The Middle Ages Series. Philadelphia, PA: University of Pennsylvania Press, 2021, xi, 299 pp., 15 color plates, 102 b/w ill, 1 map.

Abstract For several decades now, art and cultural historians have discussed the curious phenomenon of medieval badges. There are millions of specimens left until today, primarily found in northwestern and northeastern Europe, but they also existed in the south. The vast majority of badges served pilgrims to signal to the public what holy sites they had visited, but many badges also identified the social, political, or occupational group the wearer belonged to. Badges could additionally be used as symbols of oppression, such as the yellow star for Jews. Most curiously, there are also many badges showing genitalia by themselves or in combination (penis and vulva), or the scene of copulation. Badges communicated in specific fashion, and they served exceedingly well to convey information to the outside world, virtually in the form of medieval media.

Re-remembering the Holocaust in Eastern Europe

Jelena Subotić’s book is an important contribution to memory studies scholarship because it shows how the mechanism of memory appropriation connects state-led remembrance practices with the processes of national identity formation. Through the comparative analysis of Serbia, Croatia, and Lithuania, Subotić argues that Holocaust remembrance in these states is less about remembering the Holocaust – or acknowledging the states’ own responsibilities for the forced displacement and mass killing of the Jewish population on their territories – and more about the political use of the memory of the Holocaust in the context of the postcommunist transition and national identity insecurities. Yellow Star, Red Star, and particularly its chapters on Serbia and Croatia, nicely complement the existing literature – such as the work of Keith Brown, Siniša Malešević, Vjekoslav Perica, Dejan Jović, Emil Kerenji, Vjeran Pavlaković, Jelena Đureinović, Tamara Banjeglav, and Ana Ljubojević, among others – analyzing linkages between nationalism and state-sponsored memorialization practices in the post-Yugoslav states.

UOCS. V. UV study of the old open cluster NGC 188 using AstroSat

We present the UV photometry of the old open cluster NGC188 obtained using images acquired with Ultraviolet Imaging Telescope (UVIT) on board the ASTROSAT satellite, in two far-UV (FUV) and one near-UV (NUV) filters. UVIT data is utilised in combination with optical photometric data to construct the optical and UV colour-magnitude diagrams (CMDs). In the FUV images, we detect only hot and bright blue straggler stars (BSSs), one hot subdwarf, and one white dwarf (WD) candidate. In the NUV images, we detect members up to a faintness limit of ~22 mag including 21 BSSs, 2 yellow straggler stars (YSSs), and one WD candidate. This study presents the first NUV-optical CMDs, and are overlaid with updated BaSTI-IAC isochrones and WD cooling sequence, which are found to fit well to the observed CMDs. We use spectral energy distribution (SED) fitting to estimate the effective temperatures, radii, and luminosities of the UV-bright stars. We find the cluster to have an HB population with three stars (Teff = 4750 - 21000 K). We also detect two yellow straggler stars, with one of them with UV excess connected to its binarity and X-ray emission.

A new, Gaia-based, catalogue of blue straggler stars in open clusters

Context. Blue straggler stars are exotic objects present in all stellar environments whose nature and formation channels are still partially unclear. They seem to be particularly abundant in open clusters (OCs), thus offering a unique chance to tackle these problems statistically. Aims. We aim to build up a new and homogeneous catalogue of blue straggler stars (BSS) in Galactic OCs using Gaia to provide a more solid assessment of the membership of these stars. We also aim to explore possible relationships of the straggler abundance with the parent cluster’s structural and dynamical parameters. As a by-product, we also search for possible yellow straggler stars (YSS), which are believed to be stragglers in a more advanced evolution stage. Methods. We employed photometry, proper motions, and parallaxes extracted from Gaia DR2 for 408 Galactic star clusters and searched for stragglers within them after performing a careful membership analysis. Results. The number of BBS emerging from our more stringent, selection criteria turns out to be significantly smaller than in previous versions of this catalogue. OCs are therefore not a preferable environment for these kinds of stars anymore. In addition, we found that BSS start to appear in clusters with ages larger than log(t) ∼ 8.7 and are therefore absent in very young star clusters. Conclusions. The present catalogue supersedes the previous ones in several ways: membership assessment, number of stragglers found, and so forth. The new list includes 897 BSS and 77 YSS candidates in 408 OCs. We expect this catalogue to be the basis for a new round of studies of BSS and YSS.

USING COLORED SHADE NETS AND ORGANIC MULCH TO IMPROVE MICROCLIMATE, GROWTH, AND YIELD OF YELLOW SWEET PEPPER

The study was carried out to investigate the effect of using color shade nets and organic mulch on improvement microclimate, growth, yield, and its components and fruit quality of yellow sweet pepper cv. Yellow Star F1 under high temperature. The study was conducted at El- Arish Agriculture Research Station, Agric. Res. Center, North Sinai Governorate, Egypt, during the summer seasons of 2018 and 2019. The results indicated that application of color shade nets modified microclimate around pepper plants where decreased average monthly of air temperature and light intensity; however, increased air relative humidity compared with unshaded. On the other hand, using black, green, and white shade nets combined with dry vegetable residues mulch followed by barley straw mulch reflected the lowest soil temperature at depths 10 and 20 cm in both growing seasons. Also, the results showed that using green shade nets followed by black shade nets combined with dry vegetable residues or barley straw mulches recorded the highest values for a fresh and dry weight of pepper plant organs. Besides, the highest contents of Chlorophyll b in leaves and vitamin C in fruit juice were obtained when covered by green nets combined with dry vegetable residues mulch in both seasons. Also, results revealed that the interaction between shading of yellow fruit pepper plants by black and green color nets with dry vegetable residues mulch significantly increase average fruit weight and total fruit yield for marketable yield compared to the open field without mulching in the first and second season. For that, it is recommended using of shade color nets (Black and green) with organic mulch (dry vegetable residues mulch and/or barley straw mulch) under high-temperature regions for modifying microclimate conditions of pepper plants and soil to improve growth, productivity, and fruit quality traits.

Four-dimensional Ultrasound for Characterization of In Vivo Murine Aortic Valve Dynamics

Objective: Aortic valve (AoV) disease affects up to 5% of Americans over 65 years age. While AoV disease is frequently diagnosed using 3D transesophageal echocardiography, these same methods are not available for small animals, hindering the ability to track disease progression. A recently developed small animal imaging technique, four-dimensional ultrasound (4DUS), has opened the possibility of direct AoV visualization in mice. Methods: Data Acquisition: 4DUS imaging (Vevo 3100; FUJIFILM VisualSonics) was performed on the AoVs of 16 C57BL/6J mice, consisting of ten wild-type (n=5 each, male and female, 3 months old), and three osteogenesis imperfecta mice with three littermate controls (12 months old). Data Analysis: AoV data was loaded into a custom MATLAB toolbox for analysis. Data was oriented orthogonal to the aortic annulus, stabilized against intra-thoracic motion, and boundary-tracked using discrete points along both the AoV wall and the leaflet free edge. Results: This method allows for volumetric visualization of the valve across the cardiac cycle, shown here in open (Figure 1B) and closed (1C) states. Analysis-derived surfaces composing the three AoV leaflets are extracted and provide 3D visualizations of leaflet dynamics, as shown in the open (Figure 1D) and closed (1E) states with calculated displacement from end-diastole overlaid. Peak average displacements of each leaflet in the mouse displayed here were RCC: 0.38mm (yellow star), LCC: 0.35mm, and NCC: 0.31mm. Conclusions: We demonstrate the ability to reliably capture gated, volumetric in vivo data of the murine AoV, which were previously only reported through 1D and 2D measures. The technique detailed here allows for robust assessment of leaflet dynamics in 3D, thus providing a foundation for longitudinal characterization of murine models of aortic valve disease.