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Pulsational activity changes in the Cepheid Polaris (α UMi) during 2017–2018: a new amplitude decrease
Doppler tomography of the circumstellar disk of π Aquarii
Aims. The work is aimed at studying the circumstellar disk of the bright classical binary Be star p Aqr. Methods. We analysed variations of a double-peaked profile of the Ha emission line in the… Expand
Intriguing X-ray and optical variations of the γ Cassiopeiae analog HD 45314
A growing number of Be and Oe stars, named the gamma Cas stars, are known for their unusually hard and intense X-ray emission. This emission could either trace accretion by a compact companion or… Expand
Spectroscopic studies of the unique yellow supergiant α Aqr in the Cepheid instability strip
Based on 21 spectra with resolutions from 12 000 to 42 000 taken in 1997–2016 for the yellow supergiant α Aqr (which is believed to be nonvariable in the Cepheid instability strip), we have… Expand
Mystery of lithium in FS CMa stars.
Pulsational Activity of the Small-Amplitude Cepheid Polaris (α UMi) in 2018-2019
We present the results of an analysis of 20 spectra of α UMi (Polaris) obtained in September 2018 – January 2019 using 0.81m telescope of the Three College Observatory (TCO), North Carolina, USA.… Expand
Intriguing X-ray and optical variations of the γ Cas analog HD 45314 ?
Context. A growing number of Be and Oe stars, named the γ Cas stars, are known for their unusually hard and intense X-ray emission. This emission could either trace accretion by a compact companion… Expand
Properties of Galactic B[e] Supergiants: V. 3 Pup -- constraining the orbital parameters and modeling the circumstellar environments.
We report the results of a long-term spectroscopic monitoring of the A-type supergiant with the B[e] phenomenon 3 Pup = HD 62623. We confirm earlier findings that it is a binary system. The orbital… Expand
Light Curves and Period Changes of Type II Cepheids in the Globular Clusters M3 and M5
Light curves in the B, V, and Ic passbands have been obtained for the type II Cepheids V154 in M3 and V42 and V84 in M5. Alternating cycle behavior, similar to that seen among RV Tauri variables, is… Expand