Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245l..27w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 245, Apr. 1, 1981, p. L27-L31.
Astronomy and Astrophysics
Astrophysics
38
Stellar Atmospheres, Stellar Spectra, Ultraviolet Spectra, Visible Spectrum, White Dwarf Stars, Absorption Spectra, Carbon, Helium, Iue, Spectroscopic Telescopes, Swan Bands
Scientific paper
Evidence from spectroscopic observations that LDS 678 B has strong ultraviolet lines of neutral carbon in its spectrum is presented. The spectra are found to contain strong lines of C I in the ultraviolet and weak He I lines in the visible. The appearance of the star's spectrum and published photometry are consistent with its having an effective temperature near 10,600 K with a helium-dominated atmosphere and a carbon abundance lower than C:He = 0.001. The star's spectra are compared with those of the white dwarfs L879-14 and L145-141, which are cooler than LDS 678B, have C2 bands in the visible and also show strong evidence of strong ultraviolet C I lines. It is concluded that LDS 678 B has a temperature intermediate between the DB and C2 band white dwarfs and that the ultraviolet C I lines can be a useful means for finding carbon in the atmosphere of the cooler white dwarfs.
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