Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..105b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 1, Dec. 1990, p. 105-115. Research supported by SNSF.
Astronomy and Astrophysics
Astrophysics
9
O Stars, Stellar Activity, Stellar Oscillations, Supergiant Stars, Absorption Spectra, Binary Stars, Line Spectra, Periodic Variations, Stellar Spectra, Wolf-Rayet Stars
Scientific paper
The discovery of photospheric line-profile variability and associated circumstellar effects of the O star in the Gamma(2) Velorum system is reported. The subcomponents drift across the line profiles at different rates. Two pattern speeds hve been tentatively measured to be 125 and 750 km/s/day. The temporal periods are 1.94 and 0.35 day, respectively, while the two spatial periods seem to be identical to one another and are about one-sixth of the stellar circumference. A rotation period in the range of 3-6 days is inferred. Two variable emission-line components straddle the He I 667.8-nm absorption and probably show that the O star has an extended envelope.
Baade Dietrich
Schmutz Werner
van Kerkwijk Marten
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