KPD0005+5106: Hottest DO White Dwarf Much Hotter Than Assumed
Astrophysics
2007-10-25 v1
Abstract
KPD0005+5106 is the hottest known helium-rich white dwarf. We have identified NeVIII 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.
Cite
@article{arxiv.0710.4515,
title = {KPD0005+5106: Hottest DO White Dwarf Much Hotter Than Assumed},
author = {K. Werner and T. Rauch and J. W. Kruk},
journal= {arXiv preprint arXiv:0710.4515},
year = {2007}
}
Comments
To appear in proceedings of "Hydrogen-Deficient Stars" conference, held in Tuebingen, Germany, Sept. 17-21, 2007. 2 pages