Descendants of Magnetic and non-Magnetic A-type Stars

We have studied the magnetic field of about 50 active and non-active single G-K-type red giants by means of spectropolarimetry with Narval and ESPaDOnS. 30 giants have been significantly Zeeman-detected. A close study of the 17 giants with known rotational periods shows that the measured magnetic fi...

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Bibliographic Details
Main Authors: Auriere, M., Lignieres, F., Konstantinova-Antova, R., Charbonnel, C., Petit, P., Tsvetkova, S., Wade, G. A.
Format: Report
Language:unknown
Published: arXiv 2013
Subjects:
Solar and Stellar Astrophysics astro-ph.SR
FOS Physical sciences
narval
Online Access:https://dx.doi.org/10.48550/arxiv.1310.6942
https://arxiv.org/abs/1310.6942
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Summary:We have studied the magnetic field of about 50 active and non-active single G-K-type red giants by means of spectropolarimetry with Narval and ESPaDOnS. 30 giants have been significantly Zeeman-detected. A close study of the 17 giants with known rotational periods shows that the measured magnetic field strength is correlated to the rotation, in particular to the Rossby number. 4 giants for which the magnetic field is measured to be outstandingly strong with respect to the rotational period or the evolutionary state are identified as probable Ap-star descendants. We detail their magnetic properties and propose criteria to identify Ap-star descendants. : 8 pages, to appear in the proceedings of the conference "Putting A Stars into Context: Evolution, Environment, and Related Stars"

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