Preliminary Asteroseismology of EC20058-5234 and Limits on Plasmon Neutrinos

Details Preliminary Asteroseismology of EC20058-5234 and Limits on Plasmon Neutrinos Preliminary Asteroseismology of EC20058-5234 and Limits on Plasmon Neutrinos

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008coast.154...16b&link_type=abstract

Communications in Asteroseismology, Vol. 154, p.16-23

Mathematics

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Scientific paper

We present results from a preliminary asteroseismological analysis of the hot DBV EC20058-5234 based on an extensive grid of models. EC20058 is the only known stable DBV and also the hottest and provides an ideal laboratory to constrain the emission rate of plasmon neutrinos. In a Whole Earth Telescope (WET) campaign in 1997, Sullivan et al. (2008) have found 11 independent modes. We use the results of their work to perform a 6 parameter fit of the observed period spectrum. We find a best fit model consistent with the spectroscopically determined effective temperature and surface gravity for EC20058. We find that the periods can be fit successfully without invoking an uneven split of the 281s mode due to a magnetic field. Based on our best fit model, we compute rates of change for the two stable modes observed in the star, which in turn can be used to place tight constraints on plasmon neutrino emission.

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