The Effective Temperatures of O-type Stars from UV spectroscopy
Luciana Bianchi, Miriam Garcia
TL;DR
This study uses high-resolution UV spectra and advanced modeling to refine the effective temperature scale of O-type stars, confirming a downward revision compared to traditional calibrations.
Contribution
It provides new UV spectral data and analysis for three O-type stars, extending the temperature scale calibration with improved models.
Findings
Revised downward effective temperature scale for O-type stars
Confirmation of previous UV and optical spectral analyses
Extension of spectral type coverage in temperature calibrations
Abstract
We present an analysis of high resolution spectra in the far-UV -- UV range (~905-2000\AA) with non-LTE, spherical, hydrodynamical, line-blanketed models, of three O-type Galactic stars, and derive their photospheric and wind parameters. These data extend previously analyzed samples and fill a gap in spectral type coverage. The combined sample confirms a revised (downward) effective temperature scale with respect to canonical calibrations, as found in our previous works from UV and optical spectra, and in recent works by other authors.
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