Spectral and photometric observations of the B[e] stars MWC 314 and OY Gem

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Abstract:

In this paper the spectrophotometric and photometric data obtained for the sgB[e] star MWC 314 and the cPNB[e] star OY Gem during 2001–2004 at the high-mountain Assy-Turgen observatory are given. In the spectrum of MWC 314 the Ha, Hß, He I and numerous Fe II intensity lines and the forbidden [N II] and [O I] lines are present. A variation in the intensity of the Ha lines relative to the continuum (from 24 to 33) is observed. During this time the equivalent width (EW) of the Ha line was changed in the limits 138–178Å,and the brightness magnitudes in the ranges V =9.82-9.96, B - V =1.77-1. 82 and V - R =1.53-1.64. The EW of the Ha is related to the star's colour index B - V ; as the EW increases, the B - V colour index is increased. In the spectrum of OY Gem the Ha, Hß, He I and numerous Fe II intensity lines and the forbidden [Fe I], [N II], [O I], [O II], [O III] and [S II] lines are present. A variation in the intensity of the Ha lines relative to the continuum (from 100 to 138) is observed. During this time the EW of the Ha line was changed in the limits 700–955 Å,and the brightness magnitudes in the ranges V =11.05-11.36, B - V =0.32-0.38 and V - R =0.70-1.10. No correlation between the brightness V with either the colour indices or the EW of the Ha has been observed.

Keywords: B[e] stars; MWC 314; OY Gem; Photometry; Spectrophotometry

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/10556790500483618

Affiliations: Fesenkov Astrophysical Institute, 050020, Almaty, Kazakhstan

Publication date: August 1, 2005

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