Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..87..269s&link_type=abstract
Astrophysics and Space Science, vol. 87, no. 1-2, Oct. 1982, p. 269-277.
Astronomy and Astrophysics
Astrophysics
5
Binary Stars, H Alpha Line, Mass Transfer, Radial Velocity, Spectral Line Width, Stellar Spectra, Electron Density (Concentration), O Stars, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection, Stellar Winds
Scientific paper
An analysis is given of radial velocity data from observations of the H-alpha profile in the spectrum of Delta Orionis, which shows phase-dependent changes over a period of variation equal to the orbital period of the binary system. The changes observed in the profile shape go from a normal absorption profile at zero phase, to a P Cyg type at a later phase, to an absorption profile having emission at the center of the profile, and back to a normal profile at the end of the period. Assuming that the P Cyg profile is formed by a spherically symmetrical region, the analysis yields a shell radius of 2.18 stellar radii and a shell electron density of 6.54 x 10 to the -9th/cu cm, an observed expansion velocity of 50 km/sec and a mass loss of 1.3 x 10 to the -7th solar masses/year. The presence of apsidal motion is confirmed by the increasing value of omega, and the periodic variation shown by the center of mass confirms the presence of a third body.
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