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Evidence of angular momentum transport in main-sequence solar-like stars

Published online by Cambridge University Press:  27 October 2016

Othman Benomar ,
Masao Takata ,
Hiromoto Shibahashi ,
Tugdual Ceillier  and
Rafael A. García
Othman Benomar*
Affiliation:
Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Masao Takata
Affiliation:
Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Hiromoto Shibahashi
Affiliation:
Department of Astronomy, School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Tugdual Ceillier
Affiliation:
Laboratoire AIM, CEA/DSM - CNRS - Univ. Paris Diderot - IRFU/SAp, Centre de Saclay, 91191, Gif-sur-Yvette Cedex, France
Rafael A. García
Affiliation:
Laboratoire AIM, CEA/DSM - CNRS - Univ. Paris Diderot - IRFU/SAp, Centre de Saclay, 91191, Gif-sur-Yvette Cedex, France
*
†E-mail:othman.benomar@astron.s.u-tokyo.ac.jp
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Abstract

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The rotation rates in the interior and at the surface is determined for the 22 main-sequence stars with masses between 1.0 and 1.6 M⊙. The average interior rotation is measured using asteroseismology, while the surface rotation is measured by the spectroscopic v sin i or the periodic light variation due to surface structures, such as spots. It is found that the difference between the surface rotation rate determined by spectroscopy and the average rotation rate for most of stars is small enough to suggest that an efficient process of angular momentum transport operates during and/or before the main-sequence stage of stars. By comparing the surface rotation rate measured from the light variation with those measured by spectroscopy, we found hints of latitudinal differential rotation. However, this must be confirmed by a further study because our result is sensitive to a few data points.

Keywords

methods: data analysisstars: interiorsstars: oscillationsstars: rotationstars: low-mass
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 661 - 666
Copyright
Copyright © International Astronomical Union 2016 

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