The Hertzsprung-gap giant 31 Comae in 2013: Magnetic field and activity indicators

Abstract We have observed the giant star 31 Comae in April and May 2013 with the spectropolarimeter Narval at Pic du Midi Observatory, France. 31 Comae is a single, rapidly rotating giant with rotational period ~6.8 d and vsini ~ 67 km/s. We present measurements and discuss variability of the longit...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union
Main Authors: Borisova, Ana P., Konstantinova-Antova, Renada, Aurière, Michel, Petit, Pascal, Charbonnel, Corinne
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2013
Subjects:
Astronomy and Astrophysics
Space and Planetary Science
narval
Online Access:http://dx.doi.org/10.1017/s174392131400249x
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S174392131400249X
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Summary:Abstract We have observed the giant star 31 Comae in April and May 2013 with the spectropolarimeter Narval at Pic du Midi Observatory, France. 31 Comae is a single, rapidly rotating giant with rotational period ~6.8 d and vsini ~ 67 km/s. We present measurements and discuss variability of the longitudinal magnetic field (Bl), spectral activity indicators H α , CaII H&K, Ca II IR triplet and evolutionary status. Our future aim is to perform a Zeeman-Doppler imaging study for the star.

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