Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..307h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 307-312.
Astronomy and Astrophysics
Astrophysics
14
B Stars, Binary Stars, Emission Spectra, Massive Stars, Absorption Spectra, Charge Coupled Devices, Stellar Envelopes, Stellar Models
Scientific paper
While it is clear that the emission-line object Beta Lyr A is a binary system, the nature of its more massive (but spectroscopically undetected) companion has been a mystery. It is suggested that the weak absorption lines of SiII at 6347 and 6371 A, which were recently discovered in CCD spectra of Beta Lyr to move in the opposite sense to the lines of the known B8II star, are not the photospheric lines of the companion but shell lines originating in the outer parts of a disk around that companion. This model seems to reconcile all the relevant observational data and opens the way to real progress in understanding the basic geometry of the system. One direct consequence of the model - if it is correct - is that the mysterious object inside the disk may be an essentially normal star with a mass and radius corresponding to a B0-B2V star.
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