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Title: Ultraviolet observations of the hydrogen-deficient variable star MV Sagittarii
Authors: Kameswara Rao, N
Nandy, K
Keywords: B Stars;Stellar envelopes;Ultraviolet astronomy;Variable stars;Absorption spectra;Emission spectra;Irregular variable stars;Iue;light (Visible Radiation);Line spectra;Red shift;Sagittarius constellation;Spectral energy distribution
Issue Date: 1982
Publisher: Indian Academy of Sciences
Citation: Journal of Astrophysics and Astronomy, Vol. 3, pp. 79 - 92
Abstract: IUE observations of the hydrogen-deficient irregular variable star MV Sgr obtained in June-October 1980 and November 1979 are discussed. The observations reveal a prominent 2200 A absorption feature. A value of E(B - V) = 0.55 is deduced from the strength of the 2200 A band on the assumption that this absorption is caused by an interstellar medium. It is noted that the dereddened continuum obtained at different times can be fitted to a theoretical energy distribution of a helium star mode with an effective temperature of 18000 K and log g = 2.5, similar to that of BD + 10 deg 2179. After applying interstellar extinction, this theoretical energy distribution gives V = 12.7 mag, agreeing with the observed visual magnitude of about 13 in November 1979 and June-October 1980. Despite the absence of change in the continuum flux, the ultraviolet line-spectrum shows variations.
ISSN: 0250-6335
Appears in Collections:IIAP Publications

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