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| Paper: |
On Supermassive White Dwarfs |
| Volume: |
334, 14th European Workshop on White Dwarfs |
| Page: |
15 |
| Authors: |
Weidemann, V. |
| Abstract: |
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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