Other
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.171..529w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 171, June 1975, p. 529-536.
Other
18
Late Stars, Line Spectra, Molecular Spectra, Stellar Spectrophotometry, White Dwarf Stars, Main Sequence Stars, Stellar Spectra, Ubv Spectra
Scientific paper
The spectra of five stars near the cool end of the white dwarf sequence are described. GH7-21 and W489 appear to be hydrogen rich and metal deficient since their spectra contain CH bands and relatively weak C2, metal hydride, and metal line features. It is suggested that they are cooled down DA stars. GH7-22 and L97-12 are found to have nearly continuous spectra with weak Ca I and Ca II lines and other weak molecular features, which indicates that they are both metal and hydrogen deficient. The spectrum of LFT 526 is found to have strong molecular bands and metal lines; from its reduced proper motion, this star is shown to be intermediate between the Main Sequence and classical white dwarfs, possibly being either a low-mass degenerate or a sdM star. It is concluded that none of these stars have solar composition atmospheres and that both H-rich and H-poor stars exist among the cool white dwarfs.
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