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Rossby numbers of fully convective and partially convective stars

Published online by Cambridge University Press:  12 September 2017

Natália R. Landin  and
Luiz T. S. Mendes
Natália R. Landin
Affiliation:
Campus UFV Florestal - Universidade Federal de Viçosa, CEP 35690-000, Florestal-M.G., Brazil email: [email protected]
Luiz T. S. Mendes
Affiliation:
Dept. de Engenharia Eletrônica, Universidade Federal de Minas Gerais, CEP 31270-901, Belo Horizonte-M.G., Brazil email: [email protected]
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Abstract

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In this work, we investigate the stellar magnetic activity in the theoretical point of view, through the use of stellar structure and evolution models. We present theoretical values of convective turnover times and Rossby numbers for low-mass stars, calculated with the ATON stellar structure and evolution code. We concentrate our analysis on fully convective and partially convective stars motivated by recent observations of X-ray emission of slowly rotating fully convective stars, which suggest that the presence of a tachocline is not a central key for magnetic fields generation. We investigate the behavior of the convective turnover time evolution, as well as its radial profile inside the star. A discussion about the location where the convective turnover time is calculated in the stellar interior is also addressed. Our theoretical results are compared to observational data from low-mass stars.

Keywords

stars: rotationconvectionstars: activitystars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 146 - 148
Copyright
Copyright © International Astronomical Union 2017 

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