ISSN:
1572-9672
Schlagwort(e):
stars: atmospheres
;
early-type
;
mass-loss
;
X-rays
;
fundamental parameters
;
element abundances
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract The status of the continuing effort to construct radiation driven wind models for O-Stars atmospheres is reviewed. Emphasis is given to several problems relating to the fomation of UV line spectra the use of accurate atomic data, the inclusion of EUV radiation by shock heated matter, the simulation of photospheric line blocking. A new tool for O-star diagnostics is presented. This is based on the use of wind models to calculate synthetic high resolution spectra covering the observable UV region. A comparison with observed spectra then gives physical constraints on the properties of stellar winds and stellar parameters, additionally abundances can be determined. The astrophysical potential of this method is demonstrated by an application to two Of-stars, the galactic O4f-star ζ-Puppis and the LMC O3f-star Melnick 42. With regard to effective temperatures and gravities, the results from the application of classical methods to the analysis of photospheric lines are only partially verified. Explanations for the shortcomings of classical NLTE methods are discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00771052
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