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The pulsation modes of the pre-white dwarf PG 1159-035
J. E. S. Costa, S. O. Kepler, D. E. Winget +74
PG 1159-035, a pre-white dwarf with T_eff=140,000 K, is the prototype of both two classes: the PG1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-0…
Strong limits on the DFSZ axion mass with G117-B15A
A. Bischoff-Kim, M. H. Montgomery, D. E. Winget
We compute rates of period change (Pdots) for the 215s mode in G117-B15A and the 213s mode in R548, first for models without axions, and then for models with axions of increasing m…
Fine Grid Asteroseismology of R548 and G117-B15A
A. Bischoff-Kim, M. H. Montgomery, D. E. Winget
We now have a good measurement of the cooling rate of G117-B15A. In the near future, we will have equally well determined cooling rates for other pulsating white dwarfs, including…
White Dwarf Luminosity and Mass Functions from Sloan Digital Sky Survey Spectra
Steven DeGennaro, Ted von Hippel, D. E. Winget +4
We present the first phase in our ongoing work to use Sloan Digital Sky Survey (SDSS) data to create separate white dwarf (WD) luminosity functions for two or more different mass r…