UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAK SCI004000 Astronomy
BISAK SCI005000 Physics / Astrophysics
We present the study of the He-weak star HD 188101. Using spectral observations obtained with the Main stellar spectrograph (MSS) and the Nasmyth echelle spectrograph (NES) mounted on the BTA SAO RAS and the data from the literature, we determined the fundamental parameters: $T_{\rm eff}=15600 \pm 400$ K, $\log g_{\rm spec} = 3.87 \pm 0.13$, $R = 2.1-3.1$ $R_{\odot}$, $M = 3.8-4.8$ $M_{\odot}$. Chemical abundances were determined by the synthetic spectrum method: under the LTE assumption for He, N, Ti, Fe and without LTE for C, O, Mg, Si. For Si and Fe, overabundance of about 0.6 dex relative to the solar abundance was found. The non-LTE calculations with the stellar Si abundance lead to consistent abundances from lines of Si II and Si III, while the difference between LTE abundances amounts to 0.8 dex.
stars: chemically peculiar, abundances, atmospheres, magnetic fields
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