| |
 |
| Paper: |
Photometric and Spectroscopic Analysis of Warm DQ White Dwarfs |
| Volume: |
493, 19th European Workshop on White Dwarfs |
| Page: |
41 |
| Authors: |
Fortier, A.; Dufour, P. |
| Abstract: |
The "Hot DQ" white dwarfs, a new class of stars showing a surface
composition dominated by carbon (Dufour et al. 2007), represent a
challenge to stellar evolution. Little is known on how exactly they
form or evolve. The first few stars discovered in the SDSS survey
were all found in a narrow range of effective temperature
(18,000-24,000 K). It has been suggested at the last workshop that
these stars may evolve into warm (Teff = 12,000-18,000 K)
and highly polluted (log C/He > -3.0) DQ white dwarfs with atomic CI
lines (Dufour et al. 2013). We present an analysis of a sample of
such "warm DQ" white dwarfs, filling the gap between the Hot DQ and
the cooler DQ with molecular bands. |
|
|
|
|
|
