| |
 |
| Paper: |
Enigmas of Accreting Pulsating White Dwarfs |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
31 |
| Authors: |
Szkody, P.; Mukadam, A. S.; Gänsicke, B. T.; Sion, E. M.; Townsley, D.; Henden, A. |
| Abstract: |
For the past 10 years, we have accumulated ultraviolet and optical data on
the group of pulsating white dwarfs which occur in close binaries. In this
environment, they accrete from their companions, resulting in elevated
temperatures, faster spin periods and changed compositions compared to their typical
single counterparts. These conditions result in a different instability strip
than for ZZ Ceti objects and provide a means to study the effects of these
parameters on the pulsations. The greatest advantage of this group is that
they undergo dwarf nova outbursts, which move the white dwarfs out of their
instability strip as they are heated by the outburst, and then back into
the strip as the white dwarf cools on timescales of a few years rather than
the millions of years of evolutionary cooling. Our HST and optical data on
four systems that have undergone recent outbursts show very different results,
presenting some challenges to the understanding of the spin and pulsations
observed. |
|
|
|
|
|
