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Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273..542s&link_type=abstract
17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 542-547 (2010).
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White Dwarfs, Astronomical Spectra, Astronomical Telescopes, Astronomical Observatories, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Spectroscopy And Spectrophotometry, Astrometric And Interferometric Instruments, Observatories And Site Testing
Scientific paper
The helium atmosphere pulsator, EC 20058-5234 currently defines the hot edge of the DBV instability strip. Its effective temperature, estimated by both spectroscopic and asteroseismic techniques, is consistent with an extremely hot core for which models predict a neutrino cooling flux that exceeds the surface photon flux. The neutrinos are created primarily by the plasmon decay process. Although EC20058 is multiperiodic, it has been shown to be a very stable pulsator with two dominant modes. Contraction of the white dwarf has largely ceased in the DBV instability strip temperature regime, so the decreasing temperature due to cooling should lead to very small increases in the puslation periods provided no other effects such as resonant mode trapping occor. Beginning with a Whole Earth Telescope run in 1997, we have regularly obtained seasonal data on EC 20058 (largely at Mt John Observatory in NZ) in an effort to determine a Pdot for its pulsation modes and relate this to the theoretical neutrino cooling mechanism. This paper reports on progress.
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