Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157..229r&link_type=abstract
The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited
Astronomy and Astrophysics
Astronomy
8
B Stars, Iue, Stellar Mass Accretion, Supergiant Stars, Ultraviolet Astronomy, Absorption Spectra, Binary Stars, Chromosphere, Disks (Shapes), Emission Spectra, Giant Stars, Metal Ions, Photosphere, Stellar Winds
Scientific paper
High resolution International Ultraviolet Explorer spectra of delta Sge show broad, double peaked emission lines of Fe II, Cr II and ions superimposed upon a B star continuum. According to radial velocities, the broad emission lines are associated with the otherwise sharp-line late B main-sequence star. The lines are probably formed in a disk or gaseous ring which rotates 90 km/sec around the B star and which is formed by accretion from the stellar wind of the M supergiant. Inverse P Cygni-like profiles of lines of A1 (III), C (IV) and Si(IV) indicate infall of matter with velocities up to 300 km/sec near the B star. The disk luminosity obtained by summing up the UV emission lines is 10 to the 33rd power erg/sec, in rough agreement with the simple accretion theory of Bondi.
Kudritzki Rolf Peter
Reimers Dieter
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