Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.182..111w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 182, Jan. 1978, p. 111-116.
Astronomy and Astrophysics
Astronomy
13
Gravitational Effects, Radial Velocity, Red Shift, Velocity Measurement, White Dwarf Stars, Binary Stars, Companion Stars, Graphs (Charts), Stellar Temperature
Scientific paper
Results are reported for measurements of the radial velocities of the DA white dwarf CoD -38 deg 10980 and its nondegenerate companion HR 6094, which constitute a common-proper-motion binary system. The difference between the radial velocities of the two stars yields a gravitational redshift of +44 + or - 7 (p.e.) km/s for the white dwarf. The proper motions of the two stars are compared, two distance determinations are noted which give different values, and the effective temperature and radius of the white dwarf are estimated. A comparison of the gravitational redshift with theoretical mass-radius relations indicates that the redshift and effective temperature of 25,500 K appear to be well-determined, while the distance and radius are not. It is concluded that white dwarfs with interiors consisting of atoms heavier than carbon and oxygen are highly improbable.
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