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The Digitized First Byurakan Survey Database Late-Type Stars Candidates. New Confirmations. II
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R. +5 more
Three new carbon C stars was confirmed among the sample of the Late-Type Stars candidates, selected on the Digitized First Byurakan Survey (DFBS) spectral plates. The DFBS is the digitized version of the First Byurakan Survey (FBS, or Markarian survey). The FBS was the first systematic survey of the extragalactic sky. This objective-prism survey w…
The First Photometric Study of the Binary System CSS J003106.8+313347
Poro, A.; Paki, E.; Baudart, S.
We performed the first photometric study of the CSS J003106.8+313347 W Ursae Majoris (WUMa)-type system based on ground-based observations. We extracted times of minima from our observations and proposed a linear ephemeris based on the increasing incline of the orbital period using a Markov chain Monte Carlo (MCMC) approach. The PHOEBE Python code…
Herbig-Haro Flows and Young Stars in the Dobashi 5006 Dark Cloud
Rastorguev, A. S.; Magakian, T. Yu.; Movsessian, T. A. +1 more
Two new Herbig-Haro flows were found in a study of the isolated Dobashi 5006 dark cloud (l = 216°.7, b = –13°.9): one certain (HH 1179) and one presumable, associated with the infrared sources 2MASS 06082284-0936139 and 2MASS 06081525-0933490, correspondingly. Judging from their spectral energy distributions, these sources may be Class 1 objects w…
TYC 1417-891-1 and TYC 1478-742-1: Eclipsing Variable Stars. The Gaia EDR3 and TESS Photometric Data
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R. +3 more
Based on the TESS (Transiting Exoplanet Survey Satellite) phase dependent light curves, we confirm the eclipsing type variability nature for two G-type dwarfs: TYC 1417-891-1 and TYC 1478-742-1. Both objects show EA (Algol-type) light curves morphology. Orbital period for TYC 1417-891-1 is P ≈ 8.0 day and for TYC 1478-742-1, P ≈ 13.6 day. We prese…
The Digitized First Byurakan Survey Data Base. Late-Type Stars Candidates. New Confirmations. I
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R. +3 more
The Digitized First Byurakan Survey (DFBS) is the digitized version of the First Byurakan Survey (FBS, or Markarian survey). The FBS was the first systematic survey of the extragalactic sky. This objective-prism survey was carried out in 1965-1980 by B.E.Markarian and his colleagues using the 1 m Schmidt telescope of the Byurakan Astrophysical Obs…
The Mysterious Radcliffe Wave
Bobylev, V. V.; Bajkova, A. T.; Mishurov, Yu. N.
This survey is devoted to the Radcliffe Wave discovered recently by Alves et al., from an analysis of the position of molecular clouds. These authors identified a narrow chain of molecular clouds, extended essentially in one line at an angle of about 30° to the galactic axis y. Essentially, the Radcliffe Wave outlines the damped oscillations in th…
Spottedness Activity of the Young Star HIP 94235 from the Moving Group AB Doradus
Savanov, I. S.
Based on high-precision data from the archive of the TESS space mission, a study is made of the photometric variability of the brightness of HIP 94235, a bright star belonging to the 120 million years old moving group AB Doradus. We obtained an estimate for the rotation period of the star and the amplitude of the brightness variability, as well as…
Oxygen-Rich Cool Stars in the Cepheus Region. New Spectroscopic Observations of Selected Objects from the KP2001 Catalog
Gigoyan, K. S.; Kostandyan, G. R.; Petrosyan, G. V. +1 more
Spectra taken with the 2.6-m telescope at the Byurakan Astrophysical Observatory (BAO) in the λλ4000-7250Å range for eight M giants from the KP2001 catalog confirm their oxygen-rich nature. The features of these spectra are examined. Several important physical parameters from the EDR3 Gaia data base are presented. The optical variability is studie…
Orbits and Individual Masses of Some Visual Binaries
Elsanhoury, W. H.; Elkholy, E. A.; Nouh, M. I.
The orbits of visual binary systems still attract the interest of many working groups in astronomy. These orbits are the most important and reliable sources of stellar masses. In the present paper, we computed the orbits and dynamical masses of some visual binaries using an independent code. We used the Kowalsky method to compute the geometrical e…
Study of Faint Galactic Carbon Stars from the First Byurakan Spectral Sky Survey. IV. GAIA DR2 Data
Kostandyan, G. R.
Data from the second Gaia release (Gaia DR2) are used to analyze and evaluate several important parameters for 127 carbon (C) stars of which 56 are AGB stars of class N and 71 are giants of early CH classes detected in low-dispersion spectral plates from the First Byurakan Survey (FBS). For the FBS C-stars Gaia DR2 G broad – band magnitudes are in…