Ultraviolet observations of the hydrogen-deficient variable star MV Sagittarii

Details Ultraviolet observations of the hydrogen-deficient variable star MV Sagittarii Ultraviolet observations of the hydrogen-deficient variable star MV Sagittarii

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982japa....3...79r&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 3, Mar. 1982, p. 79-92.

Astronomy and Astrophysics

Astronomy

7

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

Scientific paper

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.

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