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Differential Luminosity Response of Balmer-Line Profiles in Galactic B/A Luminous Stars
N. L. Vaidman, S. A. Khokhlov, Sh. T. Nurmakhametova +3
We investigate the differential luminosity response of the optical Balmer series from H8 to H-alpha in Galactic B5-A5 luminous stars using homogeneous measurements of central depth…
Dynamical Masses and Radiative Transfer Modeling of HD 698: a Be Binary in Evolutionary Transition
Ilfa A. Gabitova, Alex C. Carciofi, Tajan H. de Amorim +13
We present a detailed analysis of the early post-mass-transfer binary HD 698 (V742 Cas) combining high-resolution optical spectroscopy, long-baseline interferometry, and radiative-…
The B[e] Phenomenon in Supergiants. A Result of Mass Transfer in Binaries, Mergers, or What?
Anatoly S. Miroshnichenko, Sergey V. Zharikov, Nadezhda L. Vaidman +1
The B[e] phenomenon discovered nearly 50 years ago features the presence of forbidden emission lines due to extended and dense circumstellar gas and large IR excesses due to the ra…
MASTER OT J072007.30+451611.6: A Polar with Strong Optical Variability and Suppressed He II Emission
A. V. Bobakov, S. V. Zharikov, A. V. Karpova +8
The transient optical source MASTER OT J072007.30+451611.6 has been recently discovered and proposed as a peculiar polar with an unusually high amplitude of the orbital brightness…
Hot donors in cataclysmic variables: The case of EI Psc
J. Kára, S. Zharikov, M. Wolf +4
Context: We present results of time-resolved optical spectroscopy and photometry of the short-orbital period dwarf nova EI Psc. Aims: This study aims to determine fundamental syste…