Discovery and analysis of a hydrogen-rich PG1159 star.

Details Discovery and analysis of a hydrogen-rich PG1159 star. Discovery and analysis of a hydrogen-rich PG1159 star.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..820d&link_type=abstract

Astronomy and Astrophysics, v.309, p.820-826

Astronomy and Astrophysics

Astrophysics

34

Stars: Abundances, Stars: Evolution, Stars: Fundamental Parameters, Stars: Individual: Hs2324+3944

Scientific paper

The discovery of a new peculiar PG1159 star by follow-up spectroscopy of candidates selected from objective-prism plates of the Hamburg Schmidt Survey is presented. From a NLTE model atmosphere analysis an effective temperature of 130000+/-10000K and a surface gravity of logg=6.2+/-0.2 are determined, which together with the high carbon abundance place HS2324+3944 in the region of low gravity PG1159 stars. The detection of hydrogen, however, makes HS2324+3944 unique amongst the PG1159 stars. While three central stars of Planetary Nebulae have spectra similar to HS2324+3944, hydrogen could not be detected up to now in any PG1159 star not associated with a nebula. The abundances of helium, carbon and nitrogen (C/He=0.3, N/He<2x10^-3^) are similar to that of "normal" PG1159 stars while the O abundance is found to be somewhat lower than "normal" (O/He=2-10x10^-3^).

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