Asteroseismic constraints on diffusion in WD envelopes

Details Asteroseismic constraints on diffusion in WD envelopes Asteroseismic constraints on diffusion in WD envelopes

2011-01-20

arxiv.org/abs/1101.3991v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 2 figures, 7 tables, accepted for publication in MNRAS

Scientific paper

The asteroseismic analysis of white dwarfs allows us to peer below their photospheres and determine their internal structure. At ~ 28,000 K EC20058-5234 is the hottest known pulsating helium atmosphere white dwarf. As such, it constitutes an important link in the evolution of white dwarfs down the cooling track. It is also astrophysically interesting because it is at a temperature where white dwarfs are expected to cool mainly through the emission of plasmon neutrinos. In the present work, we perform an asteroseismic analysis of EC20058-5234 and place the results in the context of stellar evolution and time dependent diffusion calculations. We use a parallel genetic algorithm complemented with targeted grid searches to find the models that fit the observed periods best. Comparing our results with similar modeling of EC20058-5234's cooler cousin CBS114, we find a helium envelope thickness consistent with time dependent diffusion calculations and obtain a precise mode identification for EC20058-5234.

Affiliated with

Also associated with

No associations

Rating

Asteroseismic constraints on diffusion in WD envelopes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Asteroseismic constraints on diffusion in WD envelopes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Asteroseismic constraints on diffusion in WD envelopes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-334514