A 'cool' PG 1159 star discovered by the Hamburg Schmidt Survey: NLTE analysis of HS 0704+6153

Details A 'cool' PG 1159 star discovered by the Hamburg Schmidt Survey: NLTE analysis of HS 0704+6153 A 'cool' PG 1159 star discovered by the Hamburg Schmidt Survey: NLTE analysis of HS 0704+6153

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..463d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. 463-470

Astronomy and Astrophysics

Astrophysics

22

Abundance, Carbon, Helium, Helium, Oxygen, Stellar Atmospheres, Stellar Composition, Stellar Evolution, Stellar Gravitation, Stellar Temperature, White Dwarf Stars, Astronomical Models, Astronomical Spectroscopy, Hydrogen, Local Thermodynamic Equilibrium

Scientific paper

The discovery of a new PG 1159 star by follow-up spectroscopy of candidates selected from objective-prism plates of the Hamburg Schmidt Survey is presented. From a non-local thermodynamic equilibrium (NLTE) model atmosphere analysis an effective temperature of 65 000 K and a surface gravity of log g = 7.0 is determined, which together with the extreme helium abundance (H/He less than 1 by number) place HS 0704+6153 in the region of hot DO white dwarfs. The high carbon and oxygen abundances (C/He = 0.2, O/He approximately 0.05 by number), however, are typical for PG 1159 stars. Its effective temperature is by far lower than that of any other PG 1159 star. HS 0704+6153 therefore is in the transition stage between the PG 1159 stars and the DO white dwarfs, it hence is an ideal object to study the gravitational settling of metals in helium-rich atmospheres.

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