H-alpha observations of the enigmatic Of binary BD + 40 deg 4220 = CYG OB2 no. 5 = V 729 CYG

Details H-alpha observations of the enigmatic Of binary BD + 40 deg 4220 = CYG OB2 no. 5 = V 729 CYG H-alpha observations of the enigmatic Of binary BD + 40 deg 4220 = CYG OB2 no. 5 = V 729 CYG

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..209v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 209-215.

Astronomy and Astrophysics

Astrophysics

10

Binary Stars, H Alpha Line, Stellar Mass Accretion, Stellar Models, Stellar Spectra, Early Stars, Radial Velocity, Wolf-Rayet Stars

Scientific paper

The structure of the Hα emission profile of the spectrum of BD +40°4220 has always been described as complex. Using high quality observations the author shows that the variations of the brightest part of the profile are periodic. Nevertheless, they cannot be accounted for by a mere redshift of the radial velocity curve of the absorption lines of the secondary. The author proposes a model in which this component of the emission profile is produced by material accreting on a limited area of the surface of the secondary.

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