A new calibration of stellar parameters of Galactic O stars

Details A new calibration of stellar parameters of Galactic O stars A new calibration of stellar parameters of Galactic O stars

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..633m&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

We present a new calibration of stellar parameters (Teff, bolometric corrections, luminosities, ionising fluxes) of Galactic O stars as a function of spectral type. Our study is based on a grid of non-LTE models including winds and line-blanketing computed with the code CMFGEN (Hillier & Miller 1998). Compared to previous calibrations, the main changes are: 1) a reduction of the temperature scale by 2000 to 8000 K depending on spectral type and luminosity class; 2) Bolometric corrections are reduced by 0.40 to 0.60 mag for a given spectral type; 3) luminosities are lower by 0.20 to 0.35 dex; 3) H ionising fluxes are reduced by up to 0.80 dex. Line-blanketing is the main factor responsible for these changes.

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