Extreme Helium Stars: Model Atmospheres and a NLTE analysis of BD+10°2179

Details Extreme Helium Stars: Model Atmospheres and a NLTE analysis of BD+10°2179 Extreme Helium Stars: Model Atmospheres and a NLTE analysis of BD+10°2179

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..209k&link_type=abstract

17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 209-212 (2010).

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Stars, White Dwarfs, Stellar Evolution, Chemical Analysis, Star Formation, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Abundances, Chemical Composition

Scientific paper

Extreme helium stars are hydrogen-deficient supergiants of spectral type A and B. They are believed to result from mergers in double degenerate systems, if one white dwarf is of C/O-type and the other of He-type. We calculate a new grid of model atmospheres accounting for metal line blanketing with ATLAS12 and compare it to the benchmark code STERNE. Synthetic spectra are calculated accounting for NLTE effects for many ions and applied to high-quality optical spectra of the prototype extreme helium star BD+10°2179.

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