Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..524k&link_type=abstract
Astronomy and Astrophysics, v.323, p.524-528
Astronomy and Astrophysics
Astrophysics
4
Stars: Atmospheres, Line: Profiles, Radiative Transfer, Planetary Nebulae: General
Scientific paper
The assumption of plane-parallel geometry is tested for the case of NLTE model atmospheres of central stars of planetary nebulae. As a test example, two hot hydrogen deficient central stars, namely LoTr4 and K1-27 were used. It was found that for atmospheric parameters of the star K1-27, namely T_eff_=100000K, gravity logg=6.5, stellar mass 0.52Msun_, and abundance of hydrogen n_H_/n_He_=0.2, the sphericity effects are very small. On the other hand, atmospheric parameters of LoTr4, namely T_eff_=120000K, gravity logg=5.5, stellar mass 0.65Msun_, and abundance of hydrogen n_H_/n_He_=0.5, yield much greater extension and remarkable sphericity effects.
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