Is There Evidence for Rotation or Horizontal Motions in Hot DB White Dwarfs?

Details Is There Evidence for Rotation or Horizontal Motions in Hot DB White Dwarfs? Is There Evidence for Rotation or Horizontal Motions in Hot DB White Dwarfs?

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...575.1025d&link_type=abstract

The Astrophysical Journal, Volume 575, Issue 2, pp. 1025-1029.

Astronomy and Astrophysics

Astronomy

6

Stars: White Dwarfs

Scientific paper

In a recent analysis of Goddard High Resolution Spectrograph observations of three hot DB white dwarfs, Provencal et al. suggested that the C II λ1335 doublet in two such objects is abnormally broadened. This was interpreted as the signature of rotation, or perhaps of pulsation-related horizontal motions, at a velocity of v~60kms-1. Our reanalysis of these observations shows that a self-consistent analysis of the observed C II profiles is possible without calling on additional broadening mechanisms. There is thus currently no evidence for significant rotation velocities or horizontal motions in hot DB white dwarfs.

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