The rotational velocities of white dwarfs

Details The rotational velocities of white dwarfs The rotational velocities of white dwarfs

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..821p&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Oct. 1984, p. 821-828.

Astronomy and Astrophysics

Astronomy

36

Angular Velocity, H Alpha Line, Stellar Atmospheres, Stellar Rotation, Stellar Spectra, White Dwarf Stars, Spectral Line Width, Stellar Models, Stellar Temperature

Scientific paper

High-resolution profiles of the sharp core of H-alpha have been observed in 7 DA white dwarfs. Theoretical NLTE H-alpha profiles have been calculated using blanketed, LTE model atmospheres. Profiles synthesized using an effective temperature of 20,000 K model closely match the observed profiles for stars in the range 19,000 K to 23,000 K, but profiles synthesized from lower-temperature model atmospheres are too weak to match the H-alpha cores in stars cooler than 17,000 K. The theoretical profiles have been rotationally broadened to compare with the observed profiles to derive rotational velocities for the hotter stars in our sample. For the cooler stars, the rotationally broadened profile of 40 Eri B has been used to provide limits on rotational velocities.

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