Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985msngr..41....8t&link_type=abstract
ESO Messenger (ISSN 0722-6691), no. 41, Sept. 1985, p. 8-11.
Astronomy and Astrophysics
Astronomy
7
A Stars, Astronomical Spectroscopy, H Alpha Line, Southern Sky, Emission Spectra, High Resolution, Stellar Activity, Stellar Winds
Scientific paper
Results are reported of a campaign of simultaneous observations of the H-alpha lines of HR 5999 and HD 163296 in a study of the stellar wind shapes of very young stars. The H-alpha lines were observed with EXOSAT instrumentation and a ground-based spectrograph equipped with a Reticon. Long-term variations in HD 163296 included the disappearance of significant blue absorption features and the lack of a nebulosity. The profile was classified with the type I or II P Cygni profile with variations which could have come, it is suggested, from a spherically expanding thin shell, a uniform atmosphere experiencing differential inner and outer rotations, a chromosphere surrounded by a cool, decelerating wind, or a cool, expanding envelope surrounding a hot region containing high velocity turbulence.
Catala Claude
Felenbok Paul
Praderie Francoise
Thé Pik-Sin
Tjin Djie R. E. H. A.
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