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Pulsation, Rotation and Flares in A Stars

Invited talk

Published online by Cambridge University Press:  29 August 2019

L. A. Balona
L. A. Balona*
Affiliation:
South African Astronomical Observatory, Cape Town, South Africa email: lab@saao.ac.za
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Abstract

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New observations of Kepler δ Scuti stars show that our understanding of pulsation in these stars is incomplete. A large fraction of A and B stars exhibit rotational modulation in light, suggesting that spots exist in stars with radiative envelopes. Flares are seen in some A stars, as may be expected if starspots are present. Differential rotation shear increases from M to F but decreases for A stars; it reaches a maximum among the γ Doradus variables. Current views of stars with radiative envelopes may need to be reviewed in the light of these observations.

Keywords

Stars: early-typeoscillationsspotsflaresrotation

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