Spectroscopic Analysis of Cyg OB2 Supergiants Using Unified Model Atmospheres

Details Spectroscopic Analysis of Cyg OB2 Supergiants Using Unified Model Atmospheres Spectroscopic Analysis of Cyg OB2 Supergiants Using Unified Model Atmospheres

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aspc..288..243h&link_type=abstract

Stellar Atmosphere Modeling, ASP Conference Proceedings, Vol. 288. Abstracts from a conference held 8-12 April 2002 in Tuebingen

Astronomy and Astrophysics

Astronomy

Scientific paper

We present first results of an spectroscopic analysis of 7 O supergiants in Cyg OB2 using two different model atmosphere codes (Santolaya-Rey, Puls, Herrero, 1997, A&A 323, 488; and Hillier & Miller, 1998, ApJ 496, 407). The first code has been improved including an estimation of metal line blocking effects (Puls, in prep.). The second one has been improved including a photospheric density structure (Najarro et al., in prep.). The results from both codes compare well within the observational uncertainties.
The main result of these analyses is a lower temperature scale for O supergiants as compared with previous analyses using either plane-parallel, hydrostatic or spherical, mass-lossing models (see Herrero, Puls, Villamariz, A&A 2000, 354, 193). The lower temperatures are thus an effect of the additional metal line opacity and the large mass-loss rates. In some cases, the new derived effective temperature is reduced up to 10,000 K.
As a consequence, radii and luminosities are also changed, reducing the mass discrepancy and modifying the Wind Momentum- Luminosity Relationship.

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