Searching for the roAp stars instability strip

Details Searching for the roAp stars instability strip Searching for the roAp stars instability strip

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mons.proc...75c&link_type=abstract

The Third MONS Workshop: Science Preparation and Target Selection, Proceedings of a Workshop held in Aarhus, Denmark, January 24

Computer Science

1

Scientific paper

The mechanism responsible for exciting high order acoustic oscillations in roAp stars is still being debated. Recently, Balmforth et al. (1999, 2000) proposed a model for roAp stars which predicts that the oscillations in these stars are excited in a convection free region located around the magnetic poles of the latter. Using this same model we predict the theoretical edges of the roAp stars instability strip and compare them with the observations of both roAp and noAp (no oscillating Ap) stars. Having in mind the limitations of ground based observations, particularly for oscillations with periods larger than 15 minutes, together with the dependence of the predicted oscillation periods on the position of the stars in the H-R diagram, we suggest that part of the noAp stars observed might in fact be pulsating, only the periods might be such that they cannot easily be observed from the ground.

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