Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.221..115k&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 221, no. 1-2, p. 115-133
Astronomy and Astrophysics
Astronomy
20
O Stars, Stellar Models, Stellar Rotation, Stellar Winds, Ultraviolet Astronomy, Ultraviolet Spectra, Variability, Boundary Conditions, H Alpha Line, Iue, Stellar Magnetic Fields, Stellar Structure, Time Dependence
Scientific paper
An observational description is presented of the time-dependent behavior of Discrete Absorption Components (DACs) in ultraviolet spectra of O-type stars. DACs represent the strongest manifestation of stellar-wind variability, a characteristic property of radiation-driven winds. Wind variability sets in already close to the star, as is evidenced by the low-velocity variations in several subordinate ultraviolet and optical lines. The observed characteristic timescale of the variability strongly suggests that stellar rotation plays a dominant role. We discuss the DACs behavior in terms of a model in which (localized) surface magnetic field regions impose an additional boundary condition at the base of the stellar wind, which may give rise to the observed large-scale structures.
Henrichs Hubertus F.
Kaper Lex
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