Theoretical evolution of Rossby number for solar analog stars
Abstract Magnetic fields of late-type stars are presumably generated by a dynamo mechanism at the interface layer between the radiative interior and the outer convective zone. The Rossby number, which is related to the dynamo process, shows an observational correlation with activity. It represents t...
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crcambridgeupr:10.1017/s1743921314001914 2023-05-15T18:50:45+02:00 Theoretical evolution of Rossby number for solar analog stars Castro, Matthieu Duarte, Tharcísyo do Nascimento, José Dias 2013 http://dx.doi.org/10.1017/s1743921314001914 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1743921314001914 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Proceedings of the International Astronomical Union volume 9, issue S302, page 144-145 ISSN 1743-9213 1743-9221 Astronomy and Astrophysics Space and Planetary Science journal-article 2013 crcambridgeupr https://doi.org/10.1017/s1743921314001914 2022-12-12T09:11:31Z Abstract Magnetic fields of late-type stars are presumably generated by a dynamo mechanism at the interface layer between the radiative interior and the outer convective zone. The Rossby number, which is related to the dynamo process, shows an observational correlation with activity. It represents the ratio between the rotation period of the star and the local convective turnover time. The former is well determined from observations but the latter is estimated by an empirical iterated function depending on the color index ( B-V ) and the mixing-length parameter. We computed the theoretical Rossby number of stellar models with the TGEC code, and analyze its evolution with time during the main sequence. We estimated a function for the local convective turnover time corresponding to a mixing-length parameter inferred from a solar model, and compare our results to the estimated Rossby number of 33 solar analogs and twins, observed with the spectropolarimeters ESPaDOnS@CFHT and Narval@LBT. Article in Journal/Newspaper narval narval Cambridge University Press (via Crossref) Proceedings of the International Astronomical Union 9 S302 144 145 |
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Cambridge University Press (via Crossref) |
op_collection_id |
crcambridgeupr |
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English |
topic |
Astronomy and Astrophysics Space and Planetary Science |
spellingShingle |
Astronomy and Astrophysics Space and Planetary Science Castro, Matthieu Duarte, Tharcísyo do Nascimento, José Dias Theoretical evolution of Rossby number for solar analog stars |
topic_facet |
Astronomy and Astrophysics Space and Planetary Science |
description |
Abstract Magnetic fields of late-type stars are presumably generated by a dynamo mechanism at the interface layer between the radiative interior and the outer convective zone. The Rossby number, which is related to the dynamo process, shows an observational correlation with activity. It represents the ratio between the rotation period of the star and the local convective turnover time. The former is well determined from observations but the latter is estimated by an empirical iterated function depending on the color index ( B-V ) and the mixing-length parameter. We computed the theoretical Rossby number of stellar models with the TGEC code, and analyze its evolution with time during the main sequence. We estimated a function for the local convective turnover time corresponding to a mixing-length parameter inferred from a solar model, and compare our results to the estimated Rossby number of 33 solar analogs and twins, observed with the spectropolarimeters ESPaDOnS@CFHT and Narval@LBT. |
format |
Article in Journal/Newspaper |
author |
Castro, Matthieu Duarte, Tharcísyo do Nascimento, José Dias |
author_facet |
Castro, Matthieu Duarte, Tharcísyo do Nascimento, José Dias |
author_sort |
Castro, Matthieu |
title |
Theoretical evolution of Rossby number for solar analog stars |
title_short |
Theoretical evolution of Rossby number for solar analog stars |
title_full |
Theoretical evolution of Rossby number for solar analog stars |
title_fullStr |
Theoretical evolution of Rossby number for solar analog stars |
title_full_unstemmed |
Theoretical evolution of Rossby number for solar analog stars |
title_sort |
theoretical evolution of rossby number for solar analog stars |
publisher |
Cambridge University Press (CUP) |
publishDate |
2013 |
url |
http://dx.doi.org/10.1017/s1743921314001914 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1743921314001914 |
genre |
narval narval |
genre_facet |
narval narval |
op_source |
Proceedings of the International Astronomical Union volume 9, issue S302, page 144-145 ISSN 1743-9213 1743-9221 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s1743921314001914 |
container_title |
Proceedings of the International Astronomical Union |
container_volume |
9 |
container_issue |
S302 |
container_start_page |
144 |
op_container_end_page |
145 |
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1766244510478630912 |