Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8637w&link_type=abstract
HST Proposal ID #8637
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #8637 Hot Stars
Scientific paper
We propose to determine the distance to the prototype of a new class of hot white dwarfs {WD}. Their optical spectra reveal absorption lines from ultra-high ionized metals {e.g. IonOVIII}, a phenomenon never observed before in any astronomical object. The occurrence of such features requires temperatures in the order of 10^6 K, far in excess of the stellar T_ eff. The asymmetric line profiles suggest formation in a rapidly accelerating high-speed wind {10, 000 km s^-1}. These stars represent the most convincing proof for on- going mass-loss from WDs. We have demonstrated that a large fraction of hot WDs shows this phenomenon, concluding that perhaps all WD go through this evolutionary stage. For the prototype we will determine stellar parameters and possible consequences of the mass-loss for WD evolution on hand of detailed NLTE modeling. The distance to the star is an essential prerequisite for this. We propose to derive the distance spectroscopically by determination of spectral type and luminosity class of the cool companion of the WD.
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