Hydrogen in a hydrogen-poor white dwarf - Ross 640

Details Hydrogen in a hydrogen-poor white dwarf - Ross 640 Hydrogen in a hydrogen-poor white dwarf - Ross 640

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..101l&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 1, Aug. 1977, p. 101-108.

Astronomy and Astrophysics

Astrophysics

30

Atmospheric Composition, H Lines, Hydrogen, Stellar Atmospheres, White Dwarf Stars, Line Spectra, Spectrum Analysis, Stellar Models, Stellar Spectra, Stellar Temperature

Scientific paper

Image-tube scans of the DFp white dwarf Ross 640 (EG119) are presented which show a distinguishable H-alpha line, weak H-beta, and possible H-gamma features. Weak features near 5160 and 4300 A are also suggested, but these require confirmation. Model atmospheres and line profiles are most consistent with a temperature of 8500 + or - 300 K and a hydrogen abundance of approximately 0.0003 in a helium-dominated atmosphere. Thus, Ross 640 is the first cool helium-atmosphere degenerate star with a directly determined hydrogen abundance.

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