Bucharest Observatory Research Articles

VLF Signal Variations Seen in the Bucharest Observatory Recordings .

his paper presents a new instrument setup at the Bucharest Observatory of the Astronomical Institute of the Romanian Academy, as well as preliminary results using this setup. It consists of records of VLF (very low frequency) perturbations using a superSID instrument. During March and December 2022 various mounts and settings tests have been performed. Starting October we obtained satisfactory data. We report on detecting the signature of moderate to intense solar flares (M and X–class). In this configuration, the C–class solar flares are less distinguishable from the background noise.

Considering Heritage as Part of Astronomy. 100 Years of Bucharest Observatory

Considering Heritage as Part of Astronomy. 100 Years of Bucharest Observatory

LNAWENR—linear nonadiabatic nonradial waves

This is a presentation of the pulsational model LNAWENR (linear nonadiabatic nonradial), included in the asteroseismological package ROMOSC which was implemented in the Bucharest Observatory to be used in the CoRoT mission.

Intermediate Stars in Extragalactic Radiosource Fields: Astrometric Measurements

AbstractThe statistical analysis of the O – C and the standard errors for the astrometric RRS2 standard stars, and the analysis of the standard errors for the intermediate PIRS stars for 75 extragalactic radiosource fields are presented. This study was performed at Bucharest Observatory.

A unique symbiotic-like/cataclysmic triple star 4 Dra (=CQ Dra): six years of UBV monitoring

The bright (mv ≈ 5) M3III star 4 Dra (HD108907, HR4765, CQ Dra) is a unique triple system combining in itself the basic structural properties of a symbiotic-like binary and of a cataclysmic one. The red giant 4 Dra A forms a wide binary (Porb ≈ 1703 d) with a hot companion 4 Dra B which seems to be a compact cataclysmic binary system (4 Dra BC, probable Porb of about 4 h).We have monitored the 4 Dra system in UBV at the Skalnaté Pleso and Starà Lesna Observatories and at the Tartu Astrophysical Observatory during a total of 205 nights between 1989 March 12 and 1995 June 20; a few additional data points were obtained at the Bucharest Observatory.

Photoelectric lightcurves of Asteroid 433 Eros

During January and February, 1975, four lightcurves of Asteroid 433 Eros were obtained at the Bucharest Observatory with a 50-cm reflector, in integrated light. A sizeable variation of the amplitude (from 1.3 to 0.9 magnitudes) was observed.

The program of observation of minor planets and comets at the Bucharest Observatory

The observation of minor planets and comets began at the Bucharest Observatory in 1930, using the refracting telescope Merz—Prin (D = 38 cm, F = 600 cm). The observations were interrupted during the Second World War, and only in 1951 the department of photographic astrometry, much more developed, resumed the work.The program was devoted to the observation of comets and minor planets, the maximum magnitude obtained being 12 for minor planets and 9 for comets. Beginning from 1954 the Bucharest Observatory participates in the observation of the 10 minor planets, selected for the Catalogue of Faint Stars, and up to the end of 1970 about 4000 precise positions were obtained. At the request of the Institute of Theoretical Astronomy from Leningrad, these observations are continued. Besides these, about 1000 precise positions for other minor planets were obtained in the interval 1951—1963.