The DB white dwarfs. I - The He I 4388 + 4471 + 4516 blend

Details The DB white dwarfs. I - The He I 4388 + 4471 + 4516 blend The DB white dwarfs. I - The He I 4388 + 4471 + 4516 blend

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..887w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, June 1983, p. 887-902.

Astronomy and Astrophysics

Astronomy

30

Atmospheric Models, Stellar Models, Stellar Rotation, Stellar Spectrophotometry, White Dwarf Stars, Convective Flow, Stellar Color, Stellar Gravitation, Stellar Mass Accretion

Scientific paper

The authors discuss spectrophotometric observations of 7 DB white dwarfs obtained at a resolution of ≡1.6 Å. Model atmosphere calculations are presented which show that the ratio of the equivalent widths W(λ4388)/W(λ4388+4471+4516) is a good indicator of gravity over the entire DB temperature range. An analysis of the observations using this line ratio yields a mean gravity >log g< ≡ 8.0 and mean mass >M< ≡ 0.58 M_sun; similar to the values found for the DA white dwarfs. Several He I lines are found to have sharp cores implying a mean value for the projected rotational velocity of ⪉135 km s-1. The possibility that a magnetic field combined with rotation may inhibit accretion in DB white dwarfs is discussed.

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