The ultraviolet spectrum of beta Lyrae

Details The ultraviolet spectrum of beta Lyrae The ultraviolet spectrum of beta Lyrae

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...198..453h&link_type=abstract

Astrophysical Journal, vol. 198, June 1, 1975, pt. 1, p. 453-465.

Astronomy and Astrophysics

Astronomy

40

Black Holes (Astronomy), Eclipsing Binary Stars, Stellar Spectra, Ultraviolet Spectra, Astronomical Models, B Stars, Continuous Spectra, Emission Spectra, Line Spectra, Radial Velocity

Scientific paper

Details are presented of low-resolution (0.2 to 0.4 A) scans of the spectrum of beta Lyrae in the region from 1000 to 3000 A obtained from the Copernicus OAO. The continuous spectrum appears to correspond to type B5 or later while the line spectrum is largely dominated by very strong emission of lines characteristic of earlier spectral types. Small velocity variations, similar to those of the shell lines in the visible spectrum, are seen. Consideration of the intensity variations and profiles of the lines suggests that the ultraviolet emission lines originate in a large rotating, expanding volume, probably centered on the secondary star. No features can be identified with the secondary star itself. A discussion of models for the system is given, and it is considered that present evidence suggests that the secondary object is a mass-accreting black hole.

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