KPD0005+5106: Hottest DO White Dwarf Much Hotter Than Assumed
Abstract
KPD0005+5106 is the hottest known helium-rich white dwarf. We have identified Ne VIII lines in UV and optical spectra and conclude that it is significantly hotter than previously thought, namely Teff=200 000 K instead of 120 000 K. This is a possible explanation for the observed hard X-ray emission as being of photospheric origin. Concerning its evolutionary state, we suggest that KPD0005+5106 is not a descendant of a PG1159 star but more probably related to the O(He) stars and RCrB stars.
- Publication:
-
Hydrogen-Deficient Stars
- Pub Date:
- July 2008
- DOI:
- 10.48550/arXiv.0710.4515
- arXiv:
- arXiv:0710.4515
- Bibcode:
- 2008ASPC..391..239W
- Keywords:
-
- Astrophysics
- E-Print:
- To appear in proceedings of "Hydrogen-Deficient Stars" conference, held in Tuebingen, Germany, Sept. 17-21, 2007. 2 pages