Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1152k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 1152-1155.
Astronomy and Astrophysics
Astronomy
12
Astrometry, Gravitational Effects, Red Shift, Stellar Mass, White Dwarf Stars, Error Analysis, H Alpha Line, Stellar Parallax
Scientific paper
New observations of the gravitational redshift of 40 Eri B are combined with the recent improvement in the parallax determination to derive a mass of 0.53 + or - 0.04 solar masses for the white dwarf. This is much closer to the typical value for white dwarfs, and is consistent with mass-radius relations, but inconsistent with the astrometric mass determination (0.43 + 0.02 solar masses). While the error of the astrometric mass determination might be larger than usually assumed, a discrepancy remains, which cannot be explained. If the high mass could be confirmed, it would remove 40 Eri B as a case in favor of the merging hypothesis for the explanation of the existence of low-mass white dwarfs.
Koester Detlev
Weidemann Volker
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