Discovery of CaII absorption at 1840 A in IUE spectra of two helium-rich white dwarfs

Details Discovery of CaII absorption at 1840 A in IUE spectra of two helium-rich white dwarfs Discovery of CaII absorption at 1840 A in IUE spectra of two helium-rich white dwarfs

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113l..13k&link_type=abstract

Astronomy and Astrophysics, vol. 113, no. 2, Sept. 1982, p. L13, L14. Research supported by the Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astrophysics

10

Abundance, Stellar Spectra, Ultraviolet Absorption, Ultraviolet Spectra, White Dwarf Stars, B Stars, Calcium, Carbon Stars, Iue

Scientific paper

The spectrum of the white dwarf star L 745-46 A, which is classified as DF because of the presence of Ca II H and K lines in the visible region, is found to contain the strong Ca II 1840 A absorption line in the IUE short wavelength region. The same line is more weakly in evidence in the short wavelength IUE spectrum of L 791-40, which is a DC star recently reclassified DB in view of the presence of weak He lines and otherwise exhibiting a strong C I line spectrum that is similar to that of the DC star L 79-3. The C and Ca abundances of L 791-40 establish it to be an intermediate case between the He-rich white dwarf spectral types DB, DC, C2 and DF.

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