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- W2796300587 abstract "High-dispersion spectroscopy of the H-alpha absorption line of the cool DA white dwarf G29-38 is reported. This is the star for which a recently detected IR excess has been suggested to be due to a possible brown dwarf companion. Three echelle spectra show no evidence for radial-velocity variations larger than about 1.1 + or - 8.7 km/s and are used to derive a weighted heliocentric radial velocity of 33.7 + or - 4.3 kms/s for the white dwarf. The observations of a sharp absorption-line core restricts the possible rotation of the white dwarf to 40 km/s or less and ensures that any surface magnetic field has a strength of 100,000 G or less. These results make it unlikely that the DA white dwarf has previously been in a cataclysmic variable accretion phase. 18 references." @default.
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- W2796300587 date "1988-10-01" @default.
- W2796300587 modified "2023-09-27" @default.
- W2796300587 title "High Dispersion Observations of H alpha in the Suspected Brown Dwarf, White Dwarf Binary System G29-38" @default.
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