A NLTE model atmosphere analysis of the pulsating sdO star SDSS J1600+0748

M. Latour, G. Fontaine, P. Brassard, P. Chayer, E. M. Green

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We started a program to construct several grids of suitable model atmospheres and synthetic spectra for hot subdwarf O stars computed, for comparative purposes, in LTE, NLTE, with and without metals. For the moment, we use our grids to perform fits on our spectrum of SDSS J160043. 6+074802. 9 (J1600+0748 for short), this unique pulsating sdO star. Our best fit is currently obtained with NLTE model atmospheres including carbon, nitrogen and oxygen in solar abundances, which leads to the following parameters for SDSS J1600+0748: Teff=69060±2080 K, log g=6. 00±0. 09 and log N(He)/N(H)=-0. 61±0. 06. Improvements are needed, however, particularly for fitting the available He ii lines. It is hoped that the inclusion of Fe will help remedy the situation.

Original languageEnglish (US)
Pages (from-to)141-144
Number of pages4
JournalAstrophysics and Space Science
Issue number1
StatePublished - 2010


  • Hot subdwarfs stars
  • Model atmospheres
  • SDSS J160043.6+074802.9

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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