SIMBAD references

1996A&A...311L..17H - Astronomy and Astrophysics, volume 311, L17-20 (1996/7-3)

On the hot ends of the white dwarf spectral sequences: Hot white dwarfs containing helium from the Hamburg-Schmidt survey.

HEBER U., DREIZLER S. and HAGEN H.-J.

Abstract (from CDS):

We report on the discovery of twelve very hot white dwarf stars containing helium by follow-up spectroscopy of candidates selected by the Hamburg-Schmidt survey. These stars belong to the sparsely populated spectral subclasses DAO, DO and PG1159 tracing the hottest ends of the white dwarf spectral sequences. Eight stars show helium dominated spectra (four DOs, two PG1159 stars and two very hot DO/sdO transition objects). Four stars have hydrogen dominated spectra (DAO), out of which one is a spectroscopic binary. Metal absorption lines are detected in one DO and one DAO star. The latter is unique and has to be classified as the first known DAOZ star. Spectral comparison indicates that all stars lie beyond the DB gap with Teff exceeding 45000K. Evidence is given for Teff as high as 100000K or more in some stars. With these new discoveries the Hamburg-Schmidt survey has increased the number of known DO and DAO white dwarfs and PG1159 stars by 55%, 30% and 40%, respectively, an important step towards deriving statistically meaningful samples of the hottest white dwarfs.

Abstract Copyright:

Journal keyword(s): Stars: abundances - binaries: spectroscopic - Stars: AGB and post-AGB, white dwarfs

Errata: erratum vol. 319, p. 363

Simbad objects: 27

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:1996A&A...311L..17H and select 'bookmark this link' or equivalent in the popup menu


2021.03.01-08:49:47

© Université de Strasbourg/CNRS

    • Contact