Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488l..43s&link_type=abstract
Astrophysical Journal Letters v.488, p.L43
Astronomy and Astrophysics
Astronomy
16
Stars: Individual Constellation Name: 40 Eridani B, Ultraviolet: Stars, Stars: White Dwarfs
Scientific paper
The astrometric satellite HIPPARCOS has determined the distance to the important white dwarf 40 Eridani B with an accuracy surpassing 1%. We use this datum to redetermine the mass and radius of this star and find that M = 0.501 +/- 0.011 Msolar and R = 0.0136 +/- 0.00024 Rsolar. These values, the most accurately determined masses and radii for any white dwarf star, place 40 Eri B securely on the zero-temperature carbon core mass-radius relation, considerably improving observational confirmation of the theory of stellar degeneracy. The mass is now sufficiently high that binary star evolutionary channels are no longer required to account for it. The data exclude the possibility that the surface hydrogen layer is as thick as 10-4 Msolar.
Hog Erik
Provencal Judi L.
Shipman Harry L.
Thejll Peter
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