Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-17
J.Phys. G32 (2006) 747-760
Astronomy and Astrophysics
Astrophysics
11 pages, 6 figures, accepted for publication in J. Phys. G: Nucl. Part. Phys
Scientific paper
10.1088/0954-3899/32/6/001
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. A puzzling feature of these data is that some stars appear to have radii which are significantly smaller than that expected for a standard electron-degenerate white-dwarf equations of state. 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 forwhite dwarfs. We argue that if such compact white dwarfs exist it is unlikely that they contain an iron core. We propose an alternative of strange-quark matter within the white-dwarf core. We also discuss the impact of the so-called color-flavor locked (CFL) state in strange-matter core associated with color superconductivity. 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.
Lan Nguyen Quynh
Mathews Grant J.
O'Gorman B.
Otsuki Kaori
Suh In-Saeng
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