46 citations · 164 across the 10 of their papers we have counts for
7 papers · 1 filter
Wide binary stars with non-coeval components
Oleg Malkov, Alexei Kniazev
We have estimated masses of components of visual binaries from their spectral classification. We have selected pairs, where the less massive component looks more evolved. Spectral…
Wray 15-906: a candidate luminous blue variable discovered with WISE, Herschel and SALT
O. V. Maryeva, V. V. Gvaramadze, A. Y. Kniazev +1
We present the results of study of the Galactic candidate luminous blue variable Wray 15-906, revealed via detection of its infrared circumstellar shell (of \approx2 pc in diameter…
Verification of Photometric Parallaxes with Gaia DR2 Data
Oleg Malkov, Sergey Karpov, Dana Kovaleva +10
Results of comparison of Gaia DR2 parallaxes with data derived from a combined analysis of 2MASS (Two Micron All-Sky Survey), SDSS (Sloan Digital Sky Survey), GALEX (Galaxy Evoluti…
Milky Way metallicity gradient from Gaia DR2 F/1O double-mode Cepheids
Bertrand Lemasle, Gergely Hajdu, Valery Kovtyukh +8
The ratio of the first overtone (1O) / fundamental (F) periods of mixed-mode Cepheids that pulsate simultaneously in these two modes (F/1O) is metallicity-dependent. It can therefo…
Discovery of a new bona fide luminous blue variable in Norma
V. V. Gvaramadze, A. Y. Kniazev, L. N. Berdnikov
We report the results of optical spectroscopy of the candidate evolved massive star MN44 revealed via detection of a circular shell with the Spitzer Space Telescope. First spectra…
Discovery of a new Galactic bona fide luminous blue variable with Spitzer
V. V. Gvaramadze, A. Y. Kniazev, L. N. Berdnikov +3
We report the discovery of a circular mid-infrared shell around the emission-line star Wray 16-137 using archival data of the Spitzer Space Telescope. Follow-up optical spectroscop…