Statistics – Applications
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..129g&link_type=abstract
17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 129-134 (2010).
Statistics
Applications
White Dwarfs, Brightness, Stellar Clusters, Monte Carlo Methods, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification, Stellar Clusters And Associations, Applications Of Monte Carlo Methods
Scientific paper
NGC 6791 is a metal-rich ([Fe/H] = +0.4), well populated (~3,000 stars) and nearby (m-M = 13.44mag) open cluster that has been imaged down to luminosities below those of the faintest white dwarfs, allowing us to obtain a reliable white dwarf luminosity function. The main-sequence turn-off age (~8 Gyr) and the age derived from the termination of the white dwarf cooling sequence (~6 Gyr) are very different. One possible explanation is that as white dwarfs cool, one of the ashes of helium burning, 22Ne, sinks in the deep interior of these stars. At lower temperatures, white dwarfs are expected to crystallize and phase separation of 12C and 16O is expected to occur. This sequence of events is expected to introduce significant delays in the cooling times. Using the white dwarf luminosity function of the metal-rich galactic cluster NGC 6791, we present the first solid observational evidence that indeed both gravitational sedimentation and phase separation upon crystallization occur in white dwarfs.
Althaus Leandro G.
Corsico Alejandro Hugo
Garcia-Berro Enrique
Isern Jordi
Lorén-Aguilar Pablo
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