Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982msngr..28...22a&link_type=abstract
ESO Messenger, June 1982, p. 22-25.
Astronomy and Astrophysics
Astronomy
Infrared Astronomy, Line Spectra, O Stars, Stellar Spectrophotometry, Carbon, Helium, Near Infrared Radiation, Paschen Series, Wolf-Rayet Stars
Scientific paper
Observations of O stars using a reticon (Si detector) to examine emission features in the near-IR are described. Particular note is made of studies of the He and C lines in terms of formation processes. The results of a survey of the He I 10830 A line in 67 northern O stars are outlined, with mention made of a correlation between the mass loss rate and the intensity of the He I band. No 10830 emission was seen in the four very hot supergiants surveyed. Increases in the 10830 A emission feature are suggested to be caused by an envelope comprising a large mass of material surrounding a core at temperatures from 30,000-40,000 K. The reticon permitted accurate intensity measurements, with allowances made for atmospheric absorption. Other line excesses were inventoried for the 67 stars, and the presence of C III gamma gamma 9701-9715 lines is discussed. A link is indicated between the late-type O-stars and transition Wolf-Rayet stars, with both types losing mass through a stellar wind effect.
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