Ultraviolet and visual spectroscopy of DB white dwarfs

Details Ultraviolet and visual spectroscopy of DB white dwarfs Ultraviolet and visual spectroscopy of DB white dwarfs

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..916w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. 916-929.

Other

26

Stellar Models, Stellar Spectrophotometry, Ultraviolet Spectra, Visible Spectrum, White Dwarf Stars, Abundance, Balmer Series, Carbon, Hydrogen, Iue

Scientific paper

Visual wavelength and IUE ultraviolet spectroscopy and model atmospheres of DB white dwarfs are reported. A search for spectral lines due to elements other than helium, and in particular carbon and hydrogen, was made. In no case is there a positive detection of carbon from these data, and upper limits relative to helium by number are derived in the range of C:He < 10-5 to 10-7 for the 15 DB stars with ultraviolet spectra in the temperature range 11,000K < Teff< 23,000K. Additional new DBA stars are reported. Weak hydrogen Balmer lines are observed in the spectra of five of the 27 objects.

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