Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.141h&link_type=abstract
In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 141-144 (SEE N89
Astronomy and Astrophysics
Astronomy
Iue, O Stars, Spaceborne Astronomy, Stellar Winds, Ultraviolet Astronomy, Ultraviolet Spectra, Metallicity, Stellar Luminosity, Stellar Mass Ejection, Stellar Spectra
Scientific paper
A uniform extraction, from photometrically corrected images, of spectra of the 205 Galactic O stars observed at high reslution with the IUE SWP camera prior to 1987 Jan 1 was carried out. Column densities of C(3+), N(4+), and Si(3+) were estimated from the resonance doublets using Sobolev models. The best predictor of mass-loss rates is log (M/solar mass/yr) = 1.62 log (L asterisk/L solar) - 14.9, which applies to all luminosity classes, and which is accurate to better than a factor 2 (rms). Mass-loss rates increase with increasing rotation. Differences in the P Cygni profiles of stars with similar physical characteristics are consistent with (unexplained) differences in ionization balance, rather than differrent mass-loss rates. A differential analysis is used to study abundance anomalies in the ONC and Of stars.
Howarth Ian D.
Prinja Raman K.
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