National Astronomical Research Institute Of Thailand Research Articles

Revisiting the Period Change and Frequency Analysis of a Variable Star SZ Lyncis

This study aims to investigate the period change of the variable star SZ Lyncis. The observations were conducted at the Regional Observatory for the Public, Nakhon Ratchasima (ROP-NMA), operated by the National Astronomical Research Institute of Thailand (NARIT), on January 8th-9th and February 19th-20th 2024. The data was acquired using the CCD camera with a B-filter mount on the 0.7-m reflecting telescope. We report the period change of 1.37(±0.08)´10-12 day cycle-1. Analysis of the O-C diagram revealed the presence of a binary companion with a semi-amplitude of 0.0052(±0.0002) days, the projected semi-major axis of 0.90(±0.04) AU, the eccentricity of 0.25(±0.09), and the orbital period of 1184.1(±1.5) days and the mass function of 0.07(±0.01) M⨀. We also identified the time-series light curve data using the Discrete Fourier transform (DFT) in the Period04 package and obtained results of four frequencies. The main frequency of 8.29630(±0.00002) cycle day-1 corresponds to a period of 0.1205357(±0.0000003) days. These results contribute to our understanding of the pulsation properties of SZ Lyncis and its binary system.

BIMA 2.0 Progress on ToM Analysis of Contact Binaries: IR Car, V1370 Tau and GY Pup

Abstract The Eclipsing Binaries Minima (BIMA) 2.0 Monitoring Project is a continuation of the previous BIMA program that was initiated by the collaboration of Bosscha Observatory - Lembang, Indonesia and The National Astronomical Research Institute of Thailand (NARIT) in 2012. This project aims to build an open database of eclipsing binary minima and establish each system’s orbital period and its variations in a time of minima (ToM) photometric observation using the Thai Robotic Telescope (TRT) network. In this work, we will present the progress of our monitoring program during 3 ∼ months of observations using TRT with proposal ID TRTC11A_009. We have collected ToM data at least once on 18 samples of contact binary stars and carried out O-C diagram analysis on three selected objects: IR Car, V1370 Tau, and GY Pup. We obtained six, three, and four primary minima on IR Car, V1370 Tau, and GY Pup, respectively. These three objects were chosen due to the lack of ToM data in recent years. We also use the TESS space mission ToM data to increase data coverage. Preliminary results show a significant change in O-C values and indicate mass transfer in this system.

Spectroscopic Devices for Asteroseismology With Small Telescopes in NARIT

National Astronomical Research Institute of Thailand (NARIT) has a manifold network of small telescopes installed worldwide. These telescopes serve educational and research purposes and are equipped mainly with CCD detectors for direct imaging and photometry. To extend the possible field of applications, several telescopes were fitted with commercially available medium resolution spectrographs eShel from Shelyak. With these devices, researchers in NARIT obtained a versatile tool for stellar spectroscopy. Here we describe the current status of available equipment, possible ways of upgrading, and briefly introduce the achieved results of the asteroseismologic study of fast-rotating stars.

Investigation of an eclipsing binary star V1848 Orionis

The aim of this research is to study the variation in the orbital period and the physical parameters of the eclipsing binary system V1848 Orionis. The data for this study were observed and collected at the Thai National Observatory (TNO) and the Regional Observatory for Public, Chachoengsao (ROP-CCO) operated by the National Astronomical Research Institute of Thailand (NARIT) in the B, V, R and I bands throughout December 2022. The OC diagram shows the period variation due to the third component. The properties of the third mass were calculated as 0.23±0.02 M⊙ with an orbital radius (a3sini′) of 5.2 ± 0.3 AU and a period variation of 8.7 ± 0.2 years. Our findings indicate that the light curves show asymmetry. The analysis of V1848 Orionis' light curve using the Wilson-Devinney code revealed a mass ratio of 0.756 ± 0.007, an inclination of 76.4°±0.1°, and a 9.28 % degree of contact. Furthermore, we identified a hot spot on the primary component, associated with the O'Connell effect variation. The completeness of the multi-light curves indicates the high reliability of the determined physical parameters. The masses, radii, and luminosities of the primary and secondary components are estimated to be M1 = 0.91±0.10 M⊙, M2 = 0.69±0.07 M⊙, R1 = 0.84±0.03 R⊙, R2 = 0.74±0.03 R⊙, L1 = 0.83±0.06 L⊙, and L2 = 0.54±0.04 L⊙. The evolutionary statuses of both components in the Hertzsprung-Russell diagram show that they are either normal stars or minimally evolved stars.

The pointing model of 4.5-m small radio telescope at NARIT

The efficiency of a radio telescope decisively depends on its pointing accuracy. Telescope’s pointing model (PM) contains repeatable errors due to the antenna control system’s imperfections, which can be corrected during observation. The 4.5m Small Radio Telescope (SRT’s) has been developed for education and experiments at Astropark, National Astronomical Research Institute of Thailand (NARIT), Chiang Mai (18°N 51’ 5” and 98°E 57’ 27”). We have implemented a 10-cm optical camera system installed on the SRT’s antenna structure to measure the offset of individual pointing covering all sky direction, which then are modeled, and the telescope’s PM is obtained. Here, we report preliminary results of SRT’s PM, where we obtain for each epoch -551.116 and -3811.549 arcsec for Azimuth encoder offset, and 1217.105 and -3343.866 arcsec for Elevation encoder offset. More accurate results can be obtained with better sky coverage observation.

Editorial Materials

It gives us great pleasure to announce that the Siam Physics Congress 2020 (SPC2020) held on 4–5 June 2020 through online hubs at www.spc2020.org was a resounding success. Even with the COVID-19 situation that prohibited the conventional face-to-face meeting, there were still 197 participants from Thailand and other countries attended the conference. In the SPC2020, unique opportunities had been provided for experts, academics, and educators to exchange knowledge and build friendships. The meeting consisted of plenary lectures, invited speaker sessions, and a number of contributed oral and poster presentations. Resulting from the success of SPC2020, there are qualified full research articles from presentations, which have been reviewed and compiled in IOP’s Journal of Physics: Conference Series. It is our sincere hope that these articles will contribute to advancing our understanding of Physics knowledge and applications and serve as initiators for even greater achievements in the field. Lastly but most importantly, on behalf of the organizers (Mahidol University, Prince of Songkla University and Thai Physics Society), we would like to express our gratitude for the support received from National Astronomical Research Institute of Thailand (NARIT), Institute for the Promotion of Teaching Science and Technology (IPST), Thailand Institute of Nuclear Technology (TINT), National Research Council of Thailand (NRCT), PTT Exploration and Production Public Company Limited (PTTEP), Fortis Trading Company Limited, and Professional Vacuum Partners Company Limited as well as other corporate sponsors whose generous contributions made the SPC2020 a successful and noteworthy meeting.List of titles The SPC2020 Editorial Team are available in this Pdf.

The mass distribution and the rotation curve of the Milky Way Galaxy using NARIT 4.5 m small radio telescope and the 2.3 m Onsala radio telescope

This study was aimed to make the neutral hydrogen (HI) mapping and rotation curve of the Milky Way at galactic longitude 0° to 90° in the galactic plane by using the 4.5 m Small Radio Telescope (SRT) of National Astronomical Research Institute of Thailand (NARIT) and the 2.3 m Onsala radio telescope. The HI spectra at wavelength of 21 cm can be used to analyze the dynamical properties of the Milky Way with Gaussian fitting software, which was developed by using Python programming language. SalsaJ is another free astronomical software which was also used in this study by analyzing the Gaussian spectra of the Onsala radio telescope. For making sure the performance of developed software, therefore, it will be tested between their observation spectra of NARIT 4.5 m SRT and the Onsala radio telescope together with the public international archive. The results showed that the positions of HI are distributed in a spiral - arms shape and the rotation curve is constant at the galactic distance (R) > 3 kpc. The spherical mass distribution (in terms of the surface mass density) was approximated by directly using rotation curve. Our results are in good agreement with the standard values.

Initial pointing model of the 40m Thai National Radio Telescope with an 8-inch optical telescope

As a part of the mega-project, known as “Radio Astronomy Network and Geodesy for Development (RANGD)” by National Astronomical Research Institute of Thailand (NARIT), the fully steerable 40m Thai National Radio Telescope (TNRT) is under construction in the eastern region of Chiang Mai. From December, 2019, commissioning stage of TNRT includes the determination of pointing and aperture efficiencies, which are expected at no wind condition as 2 arcsec (rms) and 60 percent at K-band, respectively. Perfect alignment between the antenna pointing system with on-sky coordinates system, e.g. equatorial, is very crucial in obtaining such high pointing accuracy. In the initial step without the K-band receiver, this can be partially achieved with the installation of an optical telescope with an imaging system on the antenna structure and the initial pointing offset can be determined by tracking planets or other celestial sources in the optical. Here, we present the complete design of the system consisted of an 8-inch reflective telescope, a focuser and 20 MP camera, which results in the field of view of 22.67 by 15.15 sq. arcmin and the resolution of 0.25 arcsec. The complete measurement procedure for such approach and discussion on the advantages and limitations are also included.

Editorial Materials

It gives us great pleasure to announce that the Siam Physics Congress (SPC2019) held 6-7 June 2019 at the Hansa JB Hotel (Hat Yai, Songkhla, Thailand) was a resounding success, with over 500 participants from Thailand and from other countries. On behalf of the organizers, Faculty of Science, Thaksin University and Thai Physics Society, we would like to express our gratitude for the support received from Thaksin University (Thailand), Council of Scientific and Technological Associations of Thailand (COSTAT), National Astronomical Research Institute of Thailand (NARIT), Synchrotron Light Research Institute (SLRI), Thailand Center of Excellence in Physics (ThEP), Institute for the Promotion of Teaching Science and Technology (IPST), as well as other corporate sponsors whose generous contributions made this a successful meeting. SPC2019 provided a unique opportunity for experts, academics, and educators to exchange knowledge and build friendships. The meeting consisted of plenary lectures, invited speaker sessions, and a number of contributed oral and poster presentations. Resulting from the success of SPC2019 are qualified full research articles from the presentations, which have been reviewed and compiled in IOP Journal of Physics: Conference Series. It is our sincere hope that these proceedings will contribute to advancing our understanding of Physics knowledge and applications and serve as initiators for even greater achievements in the field.The SPC2019 Editorial TeamYongyut LaosiritawornThawatchai TepnualPrasong KessaratikoonSarawut Thountom

Siam Physics Congress 2018 (SPC2018) A Creative Path to Sustainable Innovation

Editorial MaterialsIt gives us great pleasure to announce that the Siam Physics Congress (SPC2018) held 21-23 May 2018 at the Topland Hotel (Pitsanulok, Thailand) was a resounding success, with over 500 participants from Thailand and from other countries. On behalf of the organizers, Department of Physics, Faculty of Science, Naresuan University and Thai Physics Society, we would like to express our gratitude for the support received from Council of Scientific and Technological Associations of Thailand (COSTAT), National Astronomical Research Institute of Thailand (NARIT), Synchrotron Light Research Institute (SLRI), Thailand Center of Excellence in Physics (ThEP), Institute for the Promotion of Teaching Science and Technology (IPST), PHYWE SYSTEM (Thailand) Co., Ltd., as well as other corporate sponsors whose generous contributions made this a successful meeting. SPC2018 provided a unique opportunity for experts, academics, and educators to exchange knowledge and build friendships. The meeting consisted of plenary lectures, invited speaker sessions, and a number of contributed oral and poster presentations. Resulting from the success of SPC2018 are qualified full research articles from the presentations, which have been reviewed and compiled in IOP Journal of Physics: Conference Series. It is our sincere hope that these proceedings will contribute to advancing our understanding of Physics knowledge and applications and serve as initiators for even greater achievements in the field.The SPC2018 Editorial TeamY. Laosiritaworn, A. Pattanaporkratana and S. Thountom

The eclipsing binary star RZ Cas: accretion-driven variability of the multimode oscillation spectrum

DEM acknowledges his work as part of the research activity supported by the National Astronomical Research Institute of Thailand (NARIT), Ministry of Science and Technology of Thailand. HL acknowledges support by the DFGgrant LE 1102/3-1. ER and MGLJ acknowledge support MINECO/Spain projects AYA2014-54348-C3-1-R, ESP2014-54362-P and ESP2015-65712-C5-5-R. VT acknowledges support from RFBR grant no. 15-52-12371. SJ acknowledge the grant received from Indo-South Africa Science and Technology Cooperation INT/SAFR/P-3(3)2009) and NRF grant UID69828 funded by Departments of Science and Technology of the Indian and South African Governments under which the photometric observations were carried out from ARIES. KA, RK acknowledge their work as a research activity in the framework of Project No. 0075/GF4 'Investigation of the Variability of Stars and the Processes of Substance Exchange With a Gas-Dust Disk' DEM thanks E. Soydugan for providing her 2002 observations of RZ Cas for re-analysis. MDE thanks amateur astronomer Kari Tikkanen (Oulu University) for providing us, when we were searching for evidences of orbital period jump, his visual observations, which safely showed the orbital period jump in RZ Cas in the years 2000-2001.

Siam Physics Congress 2017 (SPC2017)

It gives us great pleasure to announce that the Siam Physics Congress (SPC2017) held 24-26 May 2017 at the Rayong Marriott Resort and Spa, Thailand was a resounding success, with over 500 participants from throughout Thailand and from other countries. On behalf of the organizers, Kasetsart University and Thai Physics Society, we would like to express our gratitude for the support received from National Astronomical Research Institute of Thailand (NARIT), Synchrotron Light Research Institute (SLRI), Thailand Institute of Nuclear Technology (TINT), Thailand Center of Excellence in Physics (ThEP), National Research Institute of Thailand (NRCT) as well as other corporate sponsors whose generous contributions made this a successful meeting. SPC2017 provided a unique opportunity for experts, academics, and educators to exchange knowledge and build friendships. The meeting consisted of two plenary lectures, invited speaker sessions, and a number of contributed oral and poster presentations. Resulting from the success of SPC2017 are qualified full research articles from the presentations, which have been reviewed and compiled in this IOP Journal of Physics: Conference Series. It is our sincere hope that these proceedings will contribute to advancing our understanding of Physics knowledge and applications and serve as initiators for even greater achievements in the field.SPC2017 Editorial Team

Status of the Thai 40-m Radio Telescope

AbstractSince the first light of the 2.4-m Thai National Telescope in 2013, Thailand foresees another great leap forward in astronomy. A project known as “Radio Astronomy Network and Geodesy for Development” (RANGD) by National Astronomical Research Institute of Thailand (NARIT) has been approved for year 2017-2021. A 40-m radio telescope has been planned to operate up to 115-GHz observation with prime-focus capability for low frequency and phased array feed receivers. The telescope’s first light is expected in late 2019 with a cryogenics K-band and L-band receivers. RFI environment at the site has been investigated and shown to be at reasonable level. A 13-m VGOS telescope is also included for geodetic applications. Early single-dish science will focus on time domain observations, such as pulsars and transients, outbursts and variability of maser and AGN sources.

THE BIMA PROJECT: O-C DIAGRAMS OF ECLIPSING BINARY SYSTEMS

The Eclipsing Binaries Minima (BIMA) Monitoring Project is a CCD-based photometric observational program initiated by Bosscha Observatory - Lembang, Indonesia in June 2012. Since December 2012 the National Astronomical Research Institute of Thailand (NARIT) has joined the BIMA Project as the main partner. This project aims to build an open-database of eclipsing binary minima and to establish the orbital period of each system and its variations. The project is conducted on the basis of multisite monitoring observations of eclipsing binaries with magnitudes less than 19 mag. Differential photometry methods have been applied throughout the observations. Data reduction was performed using IRAF. The observations were carried out in BVRI bands using three different small telescopes situated in Indonesia, Thailand, and Chile. Computer programs have been developed for calculating the time of minima. To date, more than 140 eclipsing binaries have been observed. From them 71 minima have been determined. We present and discuss the O-C diagrams for some eclipsing binary systems.

National Astronomical Research Institute of Thailand

During the last few decades, Thailand has seen a significant change in a way astronomical research and education is pursued in the country as the government realized the important roles that basic science plays in shaping up a knowledge-based society. In 2004, a cabinet resolution fulfilled the long-held dreams of the country's leading astronomers by assigning the Ministry of Science and Technology to establish the National Astronomical Research Institute of Thailand (NARIT). NARIT has been tasked to strengthen not only research and educational capacity building in astronomy and related fields but also to ensure that a foundation for basic sciences exists for appropriate technology and innovation essential for a scientific astronomy education at all levels, both in formal and informal education.

Astronomy in Thailand

AbstractDuring the last few years, Thailand has seen a significant change in the way astronomical research and education is pursued in the country. The government has approved the establishment of the National Astronomical Research Institute of Thailand (NARIT) which aims to develop not only astronomical research but also astronomy education at all levels, both in formal and informal education. A framework of national key projects exists which includes national facilities, national collaborative research networks, teacher training and public outreach programmes. Examples of these programmes will be presented in this paper.

Astronomy in Asia

AbstractAstronomy in Asia has continuously developed. Local wisdom in many Asian countries reflects their interest in astronomy since the historical period. However, the astronomical development in each country is different which depends on their cultures, politics and economics. Astronomy in some Asian developing countries such as China and India are well-developed while some other countries especially in south-east Asia, with some supports such as telescopes, training, experts etc. from some developed countries, are trying to promote relevant research in astronomy as well as use astronomy as a tool to promote scientific awareness and understanding for the public. Recently, a new national research institute in astronomy, called the National Astronomical Research Institute of Thailand (NARIT), with a 2.4-metre reflecting telescope has been established in Thailand. One of the major objectives of this research-emphasis institute would aim at a collaborative network among South-East Asian countries so as to be able to contribute new knowledge and research to the astronomical community.

Astronomy development in Thailand: the role of NARIT

AbstractAstronomy development in Thailand has improved significantly during the last few years. The government has approved the establishment of the National Astronomical Research Institute of Thailand (NARIT). Roles of NARIT in the development astronomical research and astronomy education in Thailand includes a national framework, national facilities, collaborative research networks, teacher training and public outreach programmes. The new 2.4-metre reflecting telescope will serve not only astronomy community in Thailand but also in Southeast Asia.