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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
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S339: Southern Horizons in Time-Domain Astronomy , November 2017 , pp. 77 - 82
Copyright
© International Astronomical Union 2019 

References

Balona, L. A. 2011, MNRAS, 415, 1691CrossRefGoogle Scholar
Balona, L. A. & Dziembowski, W. A. 2011, MNRAS, 417, 591CrossRefGoogle Scholar
Balona, L. A. 2012, MNRAS, 423, 3420CrossRefGoogle Scholar
Balona, L. A. 2013, MNRAS, 431, 2240CrossRefGoogle Scholar
Balona, L. A. 2015, MNRAS, 447, 2714CrossRefGoogle Scholar
Balona, L. A., Daszyńska-Daszkiewicz, J. & Pamyatnykh, A. A. 2015, MNRAS, 452, 3073CrossRefGoogle Scholar
Balona, L. A. 2016, MNRAS, 457, 3724CrossRefGoogle Scholar
Balona, L. A. & Abedigamba, O. P. 2016, MNRAS, 461, 497CrossRefGoogle Scholar
Balona, L. A. 2017, MNRAS, 467, 1830CrossRefGoogle Scholar
Dupret, M.-A., Grigahcène, A., Garrido, R., et al. 2005, A&A, 435, 927Google Scholar
Grigahcène, A., Antoci, V., Balona, L. A., et al. 2010, ApJ, 713, L192CrossRefGoogle Scholar
Houdek, G. 2000, ASPC, 210, 454Google Scholar
Houdek, G. & Dupret, M. A. 2015, Living Reviews in Solar Physics, 12, 8CrossRefGoogle Scholar
Kitchatinov, L. L. & Olemskoy, S. V. 2012, MNRAS, 423, 3344CrossRefGoogle Scholar
Küker, M. & Rüdiger, G. 2007, AN, 328, 1050Google Scholar
Niemczura, E., Murphy, S. J., Smalley, B. et al. 2015, MNRAS, 450, 2764CrossRefGoogle Scholar
Pedersen, M. G., Antoci, V., Korhonen, H. et al. 2017, MNRAS, 466, 3060CrossRefGoogle Scholar
Spruit, H. C. 2002, A&A, 381, 923Google Scholar
Xiong, D. R. 1989, A&A, 209, 126Google Scholar
Xiong, D. R., Deng, L., Zhang, C. & Wang, K. 2016, MNRAS, 457, 3163CrossRefGoogle Scholar