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

Published online by Cambridge University Press:  07 August 2014

Ana P. Borisova ,
Renada Konstantinova-Antova ,
Michel Aurière ,
Pascal Petit  and
Corinne Charbonnel
Ana P. Borisova
Affiliation:
Institute of Astronomy and NAO, Bulgarian Academy of Sciences 72 Tsarigradsko shosse blvd., BG-1784, Sofia, Bulgaria email: aborisova@astro.bas.bg
Renada Konstantinova-Antova
Affiliation:
Institute of Astronomy and NAO, Bulgarian Academy of Sciences 72 Tsarigradsko shosse blvd., BG-1784, Sofia, Bulgaria email: aborisova@astro.bas.bg Institut de Recherche en Astrophysique et Plantologie, CNRS, Universitè de Toulouse, France
Michel Aurière
Affiliation:
Institut de Recherche en Astrophysique et Plantologie, CNRS, Universitè de Toulouse, France
Pascal Petit
Affiliation:
Institut de Recherche en Astrophysique et Plantologie, CNRS, Universitè de Toulouse, France
Corinne Charbonnel
Affiliation:
Institut de Recherche en Astrophysique et Plantologie, CNRS, Universitè de Toulouse, France Universitè de Genève, Switzerland
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Abstract

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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 Hα, CaII H&K, Ca II IR triplet and evolutionary status. Our future aim is to perform a Zeeman-Doppler imaging study for the star.

Keywords

Stars: activityStars: individual: 31 ComaeStars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S302: Magnetic Fields throughout Stellar Evolution , August 2013 , pp. 365 - 366
Copyright
Copyright © International Astronomical Union 2014 

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