g-mode Pulsations in sdB stars: a Critical Test of Stellar Opacity

Details g-mode Pulsations in sdB stars: a Critical Test of Stellar Opacity g-mode Pulsations in sdB stars: a Critical Test of Stellar Opacity

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..372..615j&link_type=abstract

15th European Workshop on White Dwarfs ASP Conference Series, Vol. 372, proceedings of the conference held 7-11 August, 2006 in

Physics

Atomic Physics

Scientific paper

The identification of non-radial g-mode oscillations as the cause of variability in cool subdwarf B stars (PG1716 variables) has been frustrated by a 5 000 K discrepancy between the observed and theoretical blue edge of the instability domain. A solution to this problem has been obtained by (a) using updated Opacity Project instead of OPAL opacities and (b) considering an enhancement of nickel, in addition to that of iron, in the driving zone. This result provides a critical test for stellar opacities and the atomic physics used to compute them. This contribution reports results from a paper by Jeffery & Saio (2006b) accepted shortly before the 15th European White Dwarf workshop took place.

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