Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..821b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, June 15, 1988, p. 821-834. Research supported by S
Astronomy and Astrophysics
Astronomy
62
Abundance, Astrometry, Astronomical Spectroscopy, Fine Structure, Stellar Composition, Stellar Winds, Wolf-Rayet Stars, Emission Spectra, Forbidden Transitions, Infrared Spectra, Line Spectra, Neon, Stellar Spectra
Scientific paper
Spectra of Gamma Velorum in the 12-13 micron region have been obtained with a resolving power of 330. The 12-micron forbidden Ne II line has a rectangular profile, implying a wind terminal velocity of 1520 + or - 200 km/s. The present results suggest a mass loss rate for Gamma Velorum of 8.8 x 10 to the -5th solar masses/yr, and a Ne/He number ratio of 1.0 + or - 0.35 x 10 to the -3rd which is a factor of nine less than previous estimations. An He(+)/He(2+) ratio in excess of 6 is found in the 12-micron region, confirming the suggestion that the degree of ionization decreases outwards in the wind.
Aitken David K.
Barlow Michael J.
Roche Patrick F.
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