Abstract
Two spectra of the star BM Ori were obtained with the 2.6-m Crimean Astrophysical Observatory telescope near its maximum eclipse phase. The light detector was a CCD array. The wavelength range 5305–5373 Å was chosen in such a way that it contained no strong primary lines. Optimum filtration of the spectra yielded a signal-to-noise ratio of ∼300. Eighteen secondary lines are seen in the spectrum. Atmospheric parameters of the secondary star were determined: T eff=5740 K and logg=3.0; the secondary was classified by these parameters as being of spectral type G2 III. The best agreement between observed and synthetic spectra is achieved for metallicity [M/H]=−0.5 and microturbulence ξt=0 km s−1. The projected rotational velocity is Vsini=60 km s−, in agreement with the synchronous velocity in the hypothesis that assumes a total eclipse by the secondary star. Atmospheric elemental abundances in the secondary are estimated. Nickel, chromium, and iron exhibit an underabundance of ∼1 dex.
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Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 26, No. 6, 2000, pp. 456–464.
Original Russian Text Copyright © 2000 by Vitrichenko, Plachinda
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Vitrichenko, E.A., Plachinda, S.I. Spectrum of the star BM Ori at minimum light. Astron. Lett. 26, 390–397 (2000). https://doi.org/10.1134/1.20406
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DOI: https://doi.org/10.1134/1.20406