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ZZ Tau IRS: a Low Mass UX Ori Type Star with Strong Wind
Lamzin, S. A.; Strakhov, I. A.; Safonov, B. S. +7 more
The results of photometric, polarimetric, and spectroscopic observations of the young star ZZ Tau IRS in the visible and near-infrared bands are presented. Against the continuum of an M spectral type star about 50 emission lines of allowed (H I, He I, Na I, S II) and forbidden (O I, O II, O III, N I, N II, S II, Ca II, Fe II, Ni II) transitions we…
Instabilities of the Kinematic State of the Atmospheres of Single C-Rich Post-AGB Stars
Klochkova, V. G.; Panchuk, V. E.; Yushkin, M. V. +1 more
To search for and study the instabilities in the atmospheres of selected post-AGB stars, we have performed a long-term high-resolution spectroscopy (
Spectroscopic Binary Cepheid V350 Sgr: Revision of Physical Characteristics and Evolutionary Status
Rastorguev, A. S.; Gorynya, N. A.; Zabolotskikh, M. V.
Based on the original version of the pulsating photosphere method that allows modeling the changes in the effective temperature, a revision of the physical characteristics of the unique binary Cepheid V350 Sgr was carried out. Previously published measurements of radial velocities were used, as well as new ones obtained by us, which allowed us to …
Studying the Kinematics of the Stellar Association TW Hya from Current Data
Bobylev, V. V.; Bajkova, A. T.
The kinematics of the young stellar association near the Sun TW Hya is studied. Kinematic estimates of the age of this association were obtained in two ways. The first method—the analysis of stellar trajectories integrated back in time—gave an estimate of the age
Fractal Effects of the Stellar Medium in the Vicinity of the Sun According to Gaia DR2 Data
Rastorguev, A. S.; Ostashova, M. L.
In this paper, we study the fractal properties of the stellar medium in the solar vicinity based on the Gaia DR2 data for 200 000 stars of all spectral types at distances from 1 to 100 pc from the Sun. We consider the main stages of the development of ideas about the fractal structure in the stellar medium of galaxies. Analysis of the spatial dist…
Variability of the Ultraluminous X-ray Source M 74 X-1 in X-ray and Optical Ranges
Atapin, K. E.; Vinokurov, A. S.; Solovyeva, Yu. N. +1 more
Using observations of M 74 X-1 obtained with the Chandra X-ray Observatory and the Hubble Space Telescope, we identified this source in the optical range. Analysis of other archival data allowed us to track the evolution of M 74 X-1 over two decades of observations, as well as to search for a correlation between the object's variability in the X-r…
Study of the \boldsymbol{\mu}
Semenko, E. A.; Yakunin, I. A.; Ryabchikova, T. A. +8 more
We present a refined speckle-interferometric orbit of a binary system
Catalog of Variable Stars in the WD 0009\boldsymbol{+} \boldsymbol{+}
Galazutdinov, G. A.; Beskin, G. M.; Romanyuk, I. I. +15 more
The light curves for almost 50 thousand stars with magnitudes
Atmospheric Parameters and Application of Gaia Color Indices of Main Sequence Stars
Zhao, G.; Kovaleva, D. A.; Malkov, O. Yu. +2 more
Using stellar evolution models, empirical atlases of stellar spectra, the ATLAS9 stellar model library, and published relations between observational and astrophysical characteristics of stars of different luminosity classes, we investigate the possibilities of their separation in the space of atmospheric and photometric parameters