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Flares in A-type stars?

Authors :
Victoria Antoci
M. G. Pedersen
Heidi Korhonen
Source :
Proceedings of the International Astronomical Union. 11:150-152
Publication Year :
2015
Publisher :
Cambridge University Press (CUP), 2015.

Abstract

Stellar flares are known to originate from magnetic reconnection in the atmospheres of late–type stars or through radiatively driven wind instabilities in early–type stars. Situated right between these two groups, the A–type stars are not expected to support either of the two mechanisms. However, recent studies report flare features in theKeplerlight curves of 32 A–type stars, contradicting theory. We investigate the stars reported in literature, setting strong constraints on the detection criteria. Although significantly fewer, we conclude that flare-like features are present. To determine the origin we obtained high-resolution spectra from the Nordic Optical Telescope (NOT) for the ten brightest, flaring A-type stars for 3-4 epochs. Here we present the preliminary results of these spectroscopic observations, with respect to spectral classification and binarity.

Details

ISSN :
17439221 and 17439213
Volume :
11
Database :
OpenAIRE
Journal :
Proceedings of the International Astronomical Union
Accession number :
edsair.doi...........436191d39ce34b46ef93a13e806a8b32
Full Text :
https://doi.org/10.1017/s1743921316002179