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Article
Catalog of Variable Stars in the WD 0009 \(\boldsymbol{+}\) 501 and GRW \(\boldsymbol{+}\) 708247 Fields Based on Photometric Survey Data on Transiting Exoplanets
The light curves for almost 50 thousand stars with magnitudes \(m\in[11\overset{\textrm{m}}{.}5,19\overset{\textrm{m}}{.}5]\) ...
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Article
Eight Exoplanet Candidates in SAO Survey
We report eight new exoplanet candidates discovered at the Special Astrophysical Observatory of the Russian Academy of Sciences using the transit technique. Photometric observations were performed with a 50-cm...
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Article
Observations of Supernova SN 2018zd
We present photometric and spectrocsopic observations of SN2018zd, carried out at 9 telescopes, including the 6-m telescope of SAO RAN and the 2.5-m telescope of the Caucasus Mountain Observatory of the Sternb...
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Article
Studies of Features of Evolution of Highly Magnetized White Dwarfs and Some Other Stars under Conditions of Magnetically Induced Suppression of Convective Energy Removal. II. Modeling
We present a study of the influence of magnetically induced control of external convection in stars of different types, in particular white dwarfs, on their thermal evolution. In the work preceding this study,...
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Article
Studies of Features of Evolution of Highly Magnetized Stars—White Dwarfs. I. Observations
We present the results of observations within the program for the search for new highly magnetized white dwarfs among evolutionary old stars of this class. The program was carried out for two years at the 1-m ...
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Article
Superfast Stellar Pulsations of Hot Stars
The results of studies of superfast line profile variability in spectra of early-type star on minute and second time scales are reviewed. The spectra of bright OBA stars were obtained with the 6-meter BTA tele...
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Article
Observations of Radial Velocity Variability in Stars from the Spectra Obtained with the BTA Fiber-Fed Spectrograph in High Spectral Resolution Mode
Abstract—We present the results of observations of radial velocity variability in stars with exoplanets. Observations of a number of stars with characteristic stellar magnitudes from 8.54m to 10.5m were carried o...
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Article
Mass Constraint of Several Transiting Planets
Abstract—We present the measurements of masses of two exoplanets and one exoplanet candidate: the candidate we earlier confirmed in the KOI-974 system, a new TESS candidate in the TOI-1797 system, and the well-kn...
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Article
Super-Fast Line-Profile Variability in the Spectra of OBA Stars. II. A0 Star α2 CVn
Abstract—This study continues the investigation of the super-fast variability of line profiles in the spectra of stars of early spectral classes performed in 2017 and 2018. We investigated the variability of line...
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Article
Progenitor and Remnant of the Luminous Red Nova V838 Monocerotis
Abstract—The article presents the results of multicolor photometry, medium and low resolution spectroscopy of the red nova V838 Mon remnant for 16 years after the 2002 outburst. We also used the archival photomet...
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Article
High-Resolution Fiber-Fed Spectrograph for the 6-m Telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences: Assessment of Efficiency
Abstract—We report the results of laboratory tests of the first version of the high-resolution fiber-fed spectrograph designed for the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS...
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Article
Observation of inverse Compton emission from a long γ-ray burst
Long-duration γ-ray bursts (GRBs) originate from ultra-relativistic jets launched from the collapsing cores of dying massive stars. They are characterized by an initial phase of bright and highly variable radi...
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Article
Search for and Study of Photometric Variability of Magnetic White Dwarfs WD 2047+372 and WD 0009+501
We report the results of long-term photometric observations of the magnetic white dwarfs WD 2047+372 and WD 0009+501, aimed to search for and study regular brightness variability in these stars. The data in the V
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Article
Super-Fast Line-Profile Variability in the Spectra of OBA-Stars: B1-Star ρ Leo
This study continues our investigation of the super-fast variability of line profiles in the spectra of early-type stars. We have investigated the line-profile variability in spectra of OBA-stars with the SCOR...
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Article
LBV Candidates in M31 and M33. Overview of 20 Years of the 6-m Telescope: Observations and Results
An ongoing SAO RAS program for the 6-m telescope to search for and study luminous blue variable (LBV) candidates in the M31 and M33 galaxies was started in 1997. This paper summarizes the results of our observ...
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Article
Exoplanet Studies. Photometric Analysis of the Transmission Spectra of Selected Exoplanets
We present the results of ground based observations and model analysis of transits of exoplanets WASP-33b, WASP-43b, WASP-104b, and HD 219134b. Broadband transmission spectra (dependence of the observed radii ...
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Article
Publisher Correction: Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B
In the version of this Letter originally published, the letter í was mistakenly omitted from the surname of the author R. Sánchez-Ramírez. This has now been corrected.
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Article
Transition from fireball to Poynting-flux-dominated outflow in the three-episode GRB 160625B
The ejecta composition is an open question in gamma-ray burst (GRB) physics 1 . Some GRBs possess a quasi-thermal spectral component in the time-resolved spectral analysis ...
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Article
Exoplanet studies. Spectral confirmation of photometric exoplanet candidates discovered by the “Kepler” mission
We present the results of spectroscopic confirmation of exoplanet candidates from the “Kepler” space mission catalog. We used the NES spectrometer of the 6-m Russian BTA telescope to investigate the Doppler va...
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Article
Search for and study of photometric variability in magnetic white dwarfs
We report the results of photometric observations of a number of magnetic white dwarfs in order to search for photometric variability in these stars. These V-band observations revealed significant variability in ...
