White dwarfs with carbon bands

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Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pasp...89...78l&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 89, Feb.-Mar. 1977, p. 78-83.

Other

27

Atmospheric Models, Carbon Stars, Magnetic Stars, Stellar Models, Stellar Spectrophotometry, White Dwarf Stars, H Alpha Line, H Beta Line, Helium, Hydrocarbons, Zeeman Effect

Scientific paper

Lick Observatory spectrophotometry is presented for three recognized 4670-A stars (G47-18, G99-37, and G257-38) and the DC star L1363-3. New C I features are reported for G47-18; G257-38 has no C I but definite C2; weak bands are also noted in L1363-3, which is a Wolf 219 group member. The magnetic CH star G99-37 is examined in greater detail. Model-atmosphere calculations show that it must have a helium-dominated atmosphere, since stringent upper limits on H-alpha and H-beta central Zeeman components are found. The CH 'G' band profile is compared with the theoretical calculations of Angel and Landstreet (1974). Other upper limits for atomic lines are discussed.

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