14 citations · 27 across the 6 of their papers we have counts for
6 papers
Peculiarities of the chemical enrichment of metal-poor Stars in the Milky Way Galaxy
T. Mishenina, M. Pignatari, I. Usenko +5
The oldest stars in the Milky Way are metal-poor with [Fe/H] < -- 1.0, displaying peculiar elemental abundances compared to solar values. The relative variations in the chemical co…
Effective temperature and radial velocity of the small-amplitude Cepheid Polaris (alpha UMi) in 2015
I. A. Usenko, V. V. Kovtyukh, A. S. Miroshnichenko +1
We present the results of an analysis of 21 spectra of alpha UMi (Polaris) obtained in September - December 2015. Frequency analysis shows an increase of the pulsation period up to…
H line as an indicator of envelope presence around the Cepheid Polaris Aa ()
I. A. Usenko, A. S. Miroshnichenko, V. G. Klochkova +1
We present the results of the radial velocity () measurements of metallic lines as well as H (H) obtained in 55 high-resolution spectra of the Cepheid UMi (Polaris…
Instability of the kinematic state in the atmosphere of the hypergiant Rho Cas outside outburst
V. G. Klochkova, V. E. Panchuk, N. S. Tavolganskaya +1
Observations of the yellow hypergiant Rho Cas obtained in 2007-2011 in a wide wavelength region with spectral resolution about 60000 have enabled studies of features of its optical…
Enhancing Our Knowledge of Northern Cepheids through Photometric Monitoring
David G. Turner, Daniel J. Majaess, David J. Lane +4
A selection of known and newly-discovered northern hemisphere Cepheids and related objects are being monitored regularly through CCD observations at the automated Abbey Ridge Obser…
Polaris B, an optical companion of Polaris (alpha UMi) system: atmospheric parameters, chemical composition, distance and mass
Igor Usenko, Valentina Klochkova
We present an analysis of high-resolution spectroscopic observations of Polaris B, the optical companion of the Polaris Ab system. The star has a radial velocity V_r of -16.6km/s t…