Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..182l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, Jan. 1989, p. 182-185.
Astronomy and Astrophysics
Astronomy
9
Absorption Spectra, Brown Dwarf Stars, Dwarf Stars, H Alpha Line, Infrared Spectra, Stellar Evolution, Stellar Models, Binary Stars, Cataclysmic Variables, Stellar Mass, Stellar Orbits, Stellar Rotation, White Dwarf Stars
Scientific paper
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.
Liebert James
Pilachowski Catherine A.
Saffer Rex A.
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