We report on ancient white dwarfs found in the proper motion survey we are conducting at the Bok and USNO telescopes. To date we have surveyed approximately 2800 square degrees of sky and identified numerous WDs with Teff ≤6000. A subset of these WDs are high velocity objects that most likely belong to the Galactic halo population. Where possible, we are acquiring trigonometric parallaxes to constrain the WD masses. We apply a new Bayesian modeling approach to these WDs that consistently incorporates precursor evolutionary timescales, the initial‐final mass relation, WD interior and atmosphere models, and uses the observed magnitudes, distances, etc. to derive the distribution of WD age as a function of uncertainties in the observational parameters.
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23 November 2010
17TH EUROPEAN WHITE DWARF WORKSHOP
16–20 August 2010
Tubingen, (Germany)
Research Article|
November 23 2010
Deriving the Age of an Individual WD: SDSS, Bok, USNO, and Bayes
Ted von Hippel;
Ted von Hippel
aSiena College, Loudonville, NY, USA
bUniversity of Texas, Austin, TX, USA
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Mukremin Kilic;
Mukremin Kilic
cHarvard Smithsonian Center for Astrophysics, Cambridge, MA, USA
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Jeff Munn;
Jeff Munn
dUnited States Naval Observatory, Flagstaff, AZ, USA
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Kurtis Williams;
Kurtis Williams
bUniversity of Texas, Austin, TX, USA
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Hugh Harris;
Hugh Harris
dUnited States Naval Observatory, Flagstaff, AZ, USA
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John Thorstensen;
John Thorstensen
eDartmouth College, Hanover, NH, USA
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Jim Liebert;
Jim Liebert
fUniversity of Arizona, Tucson, AZ, USA
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Steven DeGennaro;
Steven DeGennaro
bUniversity of Texas, Austin, TX, USA
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Elizabeth Jeffery;
Elizabeth Jeffery
gSpace Telescope Science Institute, Baltimore, MD, USA
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Bill Jefferys;
Bill Jefferys
bUniversity of Texas, Austin, TX, USA
hUniveristy of Vermont, Burlington, VT, USA
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Nathan Stein;
Nathan Stein
iHarvard University, Cambridge, MA, USA
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David van Dyk
David van Dyk
jUniversity of California, Irvine, CA, USA
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AIP Conf. Proc. 1273, 141–145 (2010)
Citation
Ted von Hippel, Mukremin Kilic, Jeff Munn, Kurtis Williams, Hugh Harris, John Thorstensen, Jim Liebert, Steven DeGennaro, Elizabeth Jeffery, Bill Jefferys, Nathan Stein, David van Dyk; Deriving the Age of an Individual WD: SDSS, Bok, USNO, and Bayes. AIP Conf. Proc. 23 November 2010; 1273 (1): 141–145. https://doi.org/10.1063/1.3527791
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