On Supermassive White Dwarfs

Details On Supermassive White Dwarfs On Supermassive White Dwarfs

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..334...15w&link_type=abstract

14th European Workshop on White Dwarfs, ASP Conference Series, Vol. 334 Proceedings of a meeting held at Kiel, July 19-23, 2004

Astronomy and Astrophysics

Astronomy

10

Scientific paper

In view of recent SDSS results on hotter DQ stars Liebert et al. (2003b) suggested that all high carbon abundance WD are massive. I checked if the star LP93-21 for which already Greenstein et al. (1977) had estimated a small radius and therefore high mass could be added to support the hypothesis. It depends on the accuracy of the parallax for which a reduction of the implied very high tangential velocity favors a smaller radius and thus a higher mass. I also consider the general question of the existence of supermassive WDs: are they single, probably O/Ne WDs (Weidemann 2003) or binaries? I suggest an unsteady initial-final mass relation which collects O/Ne WDs at the high mass secondary peak of the WD mass distribution.

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