Hostname: page-component-848d4c4894-sjtt6 Total loading time: 0 Render date: 2024-07-05T18:47:09.437Z Has data issue: false hasContentIssue false

On the Spectral Classification of Cool White Dwarfs

Published online by Cambridge University Press:  14 August 2015

I. Bues*
Affiliation:
I. Mathematisches Institut der Freien Universität Berlin

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The Eggen-Greenstein (1965) classification of cool white dwarfs (DC, DF, DG, λ 4670, λ 4135) was based on the features visible in the spectra of low dispersion. Detailed model atmosphere computations (11000 ≥ Teff ≥ 7000 K) and comparison with spectra observed by Wegner (1974, 1975) show that the variety of the spectra is due to changes in the abundance ratios of C/O, C/H and H/He only. Thus the relative strengths of the C2 and CH-bands can be used for classification and guess of Teff in the range of Teff ≥ 6000 K.

Type
Part I/Influence of Abundances Upon Stellar Atmosphere Calculations
Copyright
Copyright © Reidel 1976 

References

Bues, I.: 1970, Astron. Astrophys. 7, 91.Google Scholar
Bues, I.: 1973, Astron. Astrophys. 28, 181.Google Scholar
Bues, I. and Wegner, G.: 1975, Astron. Astrophys. (in press).Google Scholar
Greenstein, J. L.: 1960, Stars and Stellar Systems 6, Univ. Chicago Press.Google Scholar
Shipman, H. L.: 1972, Astrophys. J. 177, 723.CrossRefGoogle Scholar
Strittmatter, P. A. and Wickramasinghe, D. T.: 1971, Monthly Notices Roy. Astron. Soc. 152, 47.CrossRefGoogle Scholar
Wegner, G.: 1972, Astrophys. J. 172, 451.CrossRefGoogle Scholar
Wegner, G.: 1975, Monthly Notices Roy. Astron. Soc. 171, 637.CrossRefGoogle Scholar
Wegner, G.: 1975, Monthly Notices Roy. Astron. Soc. 171, 529.CrossRefGoogle Scholar