Non-LTE spectral analyses of the lately discovered DB-gap white dwarfs from the SDSS
2009 | journal article; research paper. A publication with affiliation to the University of Göttingen.
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Non-LTE spectral analyses of the lately discovered DB-gap white dwarfs from the SDSS
Hügelmeyer, S. D. & Dreizler, S. (2009)
Journal of Physics. Conference Series, 172(1) art. 012048. DOI: https://doi.org/10.1088/1742-6596/172/1/012048
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Details
- Authors
- Hügelmeyer, S. D.; Dreizler, S.
- Abstract
- For a long time, no hydrogen-deficient white dwarfs have been known that have effective temperature between 30 kK and < 45 kK, i. e. exceeding those of DB white dwarfs and having lower ones than DO white dwarfs. Therefore, this temperature range was long known as the DB-gap. Only recently, the SDSS provided spectra of several candidate DB-gap stars. First analyses based on model spectra calculated under the assumption of local thermodynamic equilibrium (LTE) confirmed that these stars had 30 kK < Teff < 45 kK (Eisenstein et al. 2006). It has been shown for DO white dwarfs that the relaxation of LTE is necessary to account for non local effects in the atmosphere caused by the intense radiation field. Therefore, we calculated a non-LTE model grid and re-analysed the aforementioned set of SDSS spectra. Our results confirm the existence of DB-gap white dwarfs.
- Issue Date
- 2009
- Journal
- Journal of Physics. Conference Series
- Organization
- Fakultät für Physik
- ISSN
- 1742-6596
- Language
- English