White Dwarfs with Strange Matter Cores: An Analysis of Candidates

Details White Dwarfs with Strange Matter Cores: An Analysis of Candidates White Dwarfs with Strange Matter Cores: An Analysis of Candidates

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...4e..31m&link_type=abstract

The Ultraviolet Universe: Stars from Birth to Death, 26th meeting of the IAU, Joint Discussion 4, 16-17 August 2006, Prague, Cze

Computer Science

Scientific paper

We summarize masses and radii for a number of white dwarfs as deduced from a combination of proper motion studies, Hipparcos parallax distances, effective temperatures, and binary or spectroscopic masses. We construct a projection of white-dwarf radii for fixed effective mass and conclude that there is at least marginal evidence for bimodality in the radius distribution for white dwarfs. Some stars appear to have radii which are significantly smaller than that expected for a standard electron-degenerate white-dwarf equations of state. We argue that if such compact white dwarfs exist it is unlikely that they contain an iron core. We show that the data exhibit several features consistent with the expected mass-radius relation of strange dwarfs. We identify eight nearby white dwarfs which are possible candidates for strange matter cores and suggest observational tests of this hypothesis.

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