Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124..241r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 2, Aug. 1983, p. 241-246.
Astronomy and Astrophysics
Astrophysics
25
B Stars, Eclipsing Binary Stars, M Stars, Orbital Elements, Red Giant Stars, Ultraviolet Spectra, Hertzsprung-Russell Diagram, Iue, Main Sequence Stars, Radial Velocity, Stellar Envelopes, Stellar Mass Accretion, Stellar Mass Ejection
Scientific paper
The orbital elements of the Delta Sge system were improved using new radial velocity measurements. A distance of 170 pc is determined with the assumption that the companion is a mainsequence star with Te = 10,500 K (ca. B9) as found from IUE fluxes. Combining the mass-function with the locations of the components in the HR-diagram, a mass-ratio of about 3 has been obtained. A comparison with speckle-interferometric measurements of the angular separation is given. Using cicumstellar Fe II absorption lines in the UV spectrum of the B star companion, a mass-loss rate of 2 x 10 to the -8th solar mass/yr has been found for the M2 II primary. Evidence for an accretion disk around the B star fed by the M giant wind and a shock front moving with the B star is briefly discussed.
Reimers Dieter
Schroeder Klaus-Peter
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