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On the NLTE plane-parallel and spherically symmetric model atmospheres of helium rich central stars of planetary nebulae
Received 19 September 1996 / Accepted 15 January 1997
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 , gravity , stellar mass , and abundance of hydrogen , the sphericity effects are very small. On the other hand, atmospheric parameters of LoTr4, namely , gravity , stellar mass , and abundance of hydrogen , yield much greater extension and remarkable sphericity effects.
Key words: stars: atmospheres line: profiles radiative transfer planetary nebulae: general
© European Southern Observatory (ESO) 1997
Online publication: June 5, 1998