| |
 |
| Paper: |
Soft X-ray Spectroscopy of the Hot DA White Dwarf LB1919 and the PG1159 Star PG1520+525 |
| Volume: |
372, 15th European Workshop on White Dwarfs |
| Page: |
225 |
| Authors: |
Werner, K.; Drake, J.J.; Rauch, T.; Schuh, S.; Gautschy, A. |
| Abstract: |
We have performed soft X-ray spectroscopy of two hot white dwarfs with the Chandra observatory using the Low Energy Transmission Grating. The first target is the hot DA white dwarf LB 1919 (Teff = 69 000 K). This star is representative of a small group of hot DAs whose metallicities lie well below predictions from radiative levitation theory. The Chandra spectrum shows a rich absorption line spectrum which may allow to find the origin of the low-metallicity nature of these DAs. The second target is PG 1520+525, a very hot non-pulsating PG1159 star. We find that it is hotter (Teff = 150 000 K) than the pulsating prototype PG 1159−035 (Teff = 140 000 K) and conclude that both stars confine the blue edge of the GW Vir instability strip. |
|
|
|
|
|
