The binary Feige 24 - The mass, radius, and gravitational redshift of the DA white dwarf

Details The binary Feige 24 - The mass, radius, and gravitational redshift of the DA white dwarf The binary Feige 24 - The mass, radius, and gravitational redshift of the DA white dwarf

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372l..37v&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 1, 1991, p. L37-L40.

Astronomy and Astrophysics

Astrophysics

19

Binary Stars, Red Shift, Stellar Gravitation, Stellar Mass, Ultraviolet Spectra, White Dwarf Stars, Balmer Series, Ephemeris Time, Radial Velocity, Stellar Radiation

Scientific paper

Observations are reported which refine the binary ephemeris of the Feige 24 system, which contains a peculiar hot DA white dwarf and an M dwarf with an atmosphere illuminated by extreme ultraviolet radiation from the white dwarf. With the new ephemeris and a set of IUE high-dispersion spectra, showing phase-dependent redshifted C IV, N V, and Si IV resonance lines, the orbital velocity, and hence the mass (0.54 + or - 0.20 solar masses), and the gravitational redshift of the white dwarf (14.1 + or - 5.2 km/s) are determined independently. It is shown that the measured Einstein redshift is consistent with an estimated radius for the white dwarf obtained from a model atmosphere solid angle and a parallax measurement. This radius is twice the Hamada-Salpeter radius for the given mass and offers a prospect to investigate the presence of a massive hydrogen envelope in that white dwarf star.

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