Testing the White Dwarf Mass-Radius Relation with HIPPARCOS

Details Testing the White Dwarf Mass-Radius Relation with HIPPARCOS Testing the White Dwarf Mass-Radius Relation with HIPPARCOS

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...494..759p&link_type=abstract

Astrophysical Journal v.494, p.759

Astronomy and Astrophysics

Astronomy

77

Astrometry, Stars: Fundamental Parameters, Stars: Individual Constellation Name: 40 Eridani B, Ultraviolet: Stars, Stars: White Dwarfs

Scientific paper

We present the Hipparcos parallaxes and resulting radii for 10 white dwarfs in visual binaries or common proper-motion systems and 11 field white dwarfs. For bright stars, Hipparcos parallaxes have uncertainties approaching 1 mas and are thus considerably more accurate than earlier ground-based parallaxes. Overall, our results support the predictions of the white dwarf mass-radius relation and our understanding of stellar degeneracy. Our most important finding for an individual object is the position of 40 Eri B, a well-known puzzle, now consistent with single-star evolution. In addition, we present evidence supporting the existence of a range of atmosphere thicknesses for hydrogen (DA) white dwarfs.

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