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arXiv:astro-ph/0402207 (astro-ph)
[Submitted on 9 Feb 2004]

Title:The Effective Temperatures of Hot Stars II. The Early-O Types

Authors:Miriam Garcia, Luciana Bianchi
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Abstract: We derive the stellar parameters of a sample of Galactic early-O type stars by analysing their UV and Far-UV spectra from FUSE (905-1187A), IUE, HST-STIS and ORFEUS (1200-2000A). The data have been modeled with spherical, hydrodynamic, line-blanketed, non-LTE synthetic spectra computed with the WM-basic code. We obtain effective temperatures ranging from Teff = 41,000 K to 39,000 K for the O3-O4 dwarf stars, and Teff = 37,500 K for the only supergiant of the sample (O4 If+). Our values are lower than those from previous empirical calibrations for early-O types by up to 20%. The derived luminosities of the dwarf stars are also lower by 6 to 12%; however, the luminosity of the supergiant is in agreement with previous calibrations within the error bars. Our results extend the trend found for later-O types in a previous work by Bianchi & Garcia.
Comments: Accepted for publication in The Astrophysical Journal. 38 pages (including 9 figures and 4 tables)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0402207
  (or arXiv:astro-ph/0402207v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0402207
Journal reference: Astrophys.J. 606 (2004) 497-513
Related DOI: https://doi.org/10.1086/383002

Submission history

From: Miriam Garcia [view email]
[v1] Mon, 9 Feb 2004 23:12:46 UTC (269 KB)
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