Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..244n&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, May 15, 1980, p. 244-249.
Astronomy and Astrophysics
Astrophysics
47
Binary Stars, Hot Stars, Orbital Elements, Stellar Spectra, Line Spectra, O Stars, Radial Velocity, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution, Stellar Motions
Scientific paper
A new orbital solution has been derived for the Gamma 2 Velorum system from 49 moderate- and seven high-dispersion spectrograms. The new orbit yields larger eccentricity (e = 0.40) and considerably higher semiamplitude for the absorption-line component than the previous study by Ganesh and Bappu (1967). The resulting minimum masses are 17 and 32 solar masses for the WC8 and the O9 I components, respectively. The excitation potential versus barycenter velocity correlations present in the WC8 component spectrum are interpreted as indicating an outward accelerated velocity field, and the phase-dependent variations of the violetshifted He I absorption at a wavelength of 3888 A, as indicative of an asymmetric shape of the envelope where the line is formed. Such an asymmetric envelope may actually result from the merging of the He I line-forming layer of the W-R envelope and an expanding, asymmetric, diluted envelope associated with the system and seen predominantly around the conjunction where the O component is in front.
Niemela Virpi S.
Sahade Jorge
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