Frequency variations in the PG 1159 pulsator PG 0122+200

Details Frequency variations in the PG 1159 pulsator PG 0122+200 Frequency variations in the PG 1159 pulsator PG 0122+200

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jphcs.172a2063v&link_type=abstract

Journal of Physics: Conference Series, Volume 172, Issue 1, pp. 012063 (2009).

Physics

Scientific paper

PG 0122+200 is the coolest PG 1159 pulsator. On theoretical basis, its cooling time scale was predicted to be dominated by neutrino emission. The measurement of the frequency variation (or P) for a number of its pulsation modes would then provide an empirical estimate of the yet uncertain neutrino emission rate. To test this prediction, we reanalysed the time-series obtained during the seven observing campaigns spanning a time interval of 19 years. We determine the time variations for the seven largest amplitude modes. This includes two complete triplets and one component of a third triplet. We find that PG 0122+200 exhibits much larger frequency variations and on considerably shorter time scales than the ones predicted by cooling theory. We suggest that these variations are not dominated by the star cooling but instead by nonlinear coupling induced by rotation.

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