THE EFFECTIVE TEMPERATURES OF HOT STARS

PAUL A. CROWTHER
Dept. of Physics & Astronomy, University College London
Gower Street, London, WC1E 6BT, England

Abstract:

We review the effective temperature scale of hot (10kK) stars, including results from direct, continuum and ionization equilibrium techniques. We discuss the impact of recent developments in theoretical model atmospheres for OB subdwarfs, dwarfs and supergiants, white dwarfs and Wolf Rayet stars and present a revised scale for OB stars. Direct techniques coupled with Kurucz model atmospheres allow Strömgren photometry to be used as a sensitive indicator for normal stars with 25kK. Reliable determinations for hotter, low surface gravity and H-deficient stars require sophisticated ionization equilibrium techniques, generally considering non-LTE and line-blanketing effects.

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• Continuum techniques
  • Direct methods
  • Continuum flux methods
  • Photometric methods
• Spectroscopic techniques
  • OB dwarfs and supergiants
  • OB subdwarfs
  • White Dwarfs and PG1159 stars
  • Wolf-Rayet stars
• About this document ...

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Paul Crowther
Wed Sep 23 13:41:03 BST 1998