NLTE line-blanketed model atmospheres for hot subdwarf O stars

Details NLTE line-blanketed model atmospheres for hot subdwarf O stars NLTE line-blanketed model atmospheres for hot subdwarf O stars

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..255l&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 255-258 (2010).

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Spectral Analysis, Element Relative Abundance, Spectroscopy, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Abundances, Chemical Composition, Spectroscopy And Spectrophotometry

Scientific paper

We present our new grids of NLTE model atmospheres for hot subdwarf O (sdO) stars computed with the public codes TLUSTY and SYNSPEC and including the effects of metal line blanketing. Until recently, large grids of NLTE models could not be practically computed over reasonable timescales, and have remained unavailable for quantitative spectroscopic analyses of this category of hot stars. We solved the problem by adapting TLUSTY and SYNSPEC to run in parallel mode on a small dedicated cluster of 80 fast processors. We present a comparison of three different NLTE grids including different elements. By fitting synthetic spectra from a given grid with another one, we obtain ``maps'' showing the line blanketing effects of metals, i.e., the differences between the real atmospheric parameters (Teff and log g) and the ones inferred by the fitting procedure. Finally, we present the results of the spectral analysis of SDSS J1600+0748, this unique pulsating sdO star, using our different grids of NLTE model atmospheres.

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