Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122....9f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 9-16.
Astronomy and Astrophysics
Astrophysics
11
O Stars, Stellar Atmospheres, Stellar Winds, Ultraviolet Spectra, Variable Stars, Atmospheric Ionization, Iue, Resonance Lines, Stellar Spectra
Scientific paper
Five O-stars have been monitored with IUE in the far-UV, at high resolution, to study resonance line profile variability. The O-type stars Zeta Pup, 9Sgr, HD 175754, Lambda Ori A, and HD 105056 have strong stellar winds. Their resonance line profiles of N V, Si IV, and C IV ions, observed at different epochs since May 1978, have been compared in the displaced absorption components. Noticeable evidence of profile changes is detected in the spectra of Lambda Ori A, Zeta Pup, and HD 175754. From the profile shapes and associated variability it is inferred that two different mechanisms could be producing the observed ionization stages: a thermal mechanism in a hot post-coronal region, at an electron temperature of 2 x 10 to the 5th K, and an Auger mechanism of ionization of cool high velocity gas by X rays coming from inner coronal regions.
Franco Lucia M.
Kontizas Evangelista
Kontizas Mary
Stalio Roberto
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