Kepler rapidly rotating giant stars

Rapidly rotating giant stars are relatively rare and may represent important stages of stellar evolution, resulting from stellar coalescence of close binary systems or accretion of substellar companions by their hosting stars. In the present Letter, we report 17 giant stars observed in the scope of...

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Principais autores: Costa, A. D., Martins, B. L. Canto, Bravo, J. P., Paz-Chinchón, F., Chagas, M. L. das, Leão, I. C., Oliveira, G. Pereira de, Silva, R. Rodrigues da, Roque, S., Oliveira, L. L. A. de, Silva, D. Freire da, Medeiros, José Renan de
Formato: article
Idioma:English
Publicado em: American Astronomical Society
Assuntos:
Stars: evolution
Stars: fundamental parameters
Stars: rotation
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/29083
http://dx.doi.org/10.1088/2041-8205/807/2/L21
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id ri-123456789-29083
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spelling ri-123456789-290832022-10-20T20:51:01Z Kepler rapidly rotating giant stars Costa, A. D. Martins, B. L. Canto Bravo, J. P. Paz-Chinchón, F. Chagas, M. L. das Leão, I. C. Oliveira, G. Pereira de Silva, R. Rodrigues da Roque, S. Oliveira, L. L. A. de Silva, D. Freire da Medeiros, José Renan de Stars: evolution Stars: fundamental parameters Stars: rotation Rapidly rotating giant stars are relatively rare and may represent important stages of stellar evolution, resulting from stellar coalescence of close binary systems or accretion of substellar companions by their hosting stars. In the present Letter, we report 17 giant stars observed in the scope of the Kepler space mission exhibiting rapid rotation behavior. For the first time, the abnormal rotational behavior for this puzzling family of stars is revealed by direct measurements of rotation, namely from photometric rotation period, exhibiting a very short rotation period with values ranging from 13 to 55 days. This finding points to remarkable surface rotation rates, up to 18 times the rotation of the Sun. These giants are combined with six others recently listed in the literature for mid-infrared (IR) diagnostics based on Wide-field Infrared Survey Explorer information, from which a trend for an IR excess is revealed for at least one-half of the stars, but at a level far lower than the dust excess emission shown by planet-bearing main-sequence stars. 2020-05-28T12:14:45Z 2020-05-28T12:14:45Z 2015 article MEDEIROS, José Renan de et al. Kepler rapidly rotating giant stars. The Astrophysical Journal, [s. l.], v. 807, p. L21, 2015. ISSN 1538-4357 versão online. DOI https://doi.org/10.1088/2041-8205/807/2/L21. Disponível em: http://iopscience.iop.org/article/10.1088/2041-8205/807/2/L21/meta. Acesso em: 28 maio 2020. 0004-637X (print), 1538-4357 (online) https://repositorio.ufrn.br/jspui/handle/123456789/29083 http://dx.doi.org/10.1088/2041-8205/807/2/L21 en American Astronomical Society
institution Repositório Institucional
collection RI - UFRN
language English
topic Stars: evolution
Stars: fundamental parameters
Stars: rotation
spellingShingle Stars: evolution
Stars: fundamental parameters
Stars: rotation
Costa, A. D.
Martins, B. L. Canto
Bravo, J. P.
Paz-Chinchón, F.
Chagas, M. L. das
Leão, I. C.
Oliveira, G. Pereira de
Silva, R. Rodrigues da
Roque, S.
Oliveira, L. L. A. de
Silva, D. Freire da
Medeiros, José Renan de
Kepler rapidly rotating giant stars
description Rapidly rotating giant stars are relatively rare and may represent important stages of stellar evolution, resulting from stellar coalescence of close binary systems or accretion of substellar companions by their hosting stars. In the present Letter, we report 17 giant stars observed in the scope of the Kepler space mission exhibiting rapid rotation behavior. For the first time, the abnormal rotational behavior for this puzzling family of stars is revealed by direct measurements of rotation, namely from photometric rotation period, exhibiting a very short rotation period with values ranging from 13 to 55 days. This finding points to remarkable surface rotation rates, up to 18 times the rotation of the Sun. These giants are combined with six others recently listed in the literature for mid-infrared (IR) diagnostics based on Wide-field Infrared Survey Explorer information, from which a trend for an IR excess is revealed for at least one-half of the stars, but at a level far lower than the dust excess emission shown by planet-bearing main-sequence stars.
format article
author Costa, A. D.
Martins, B. L. Canto
Bravo, J. P.
Paz-Chinchón, F.
Chagas, M. L. das
Leão, I. C.
Oliveira, G. Pereira de
Silva, R. Rodrigues da
Roque, S.
Oliveira, L. L. A. de
Silva, D. Freire da
Medeiros, José Renan de
author_facet Costa, A. D.
Martins, B. L. Canto
Bravo, J. P.
Paz-Chinchón, F.
Chagas, M. L. das
Leão, I. C.
Oliveira, G. Pereira de
Silva, R. Rodrigues da
Roque, S.
Oliveira, L. L. A. de
Silva, D. Freire da
Medeiros, José Renan de
author_sort Costa, A. D.
title Kepler rapidly rotating giant stars
title_short Kepler rapidly rotating giant stars
title_full Kepler rapidly rotating giant stars
title_fullStr Kepler rapidly rotating giant stars
title_full_unstemmed Kepler rapidly rotating giant stars
title_sort kepler rapidly rotating giant stars
publisher American Astronomical Society
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/29083
http://dx.doi.org/10.1088/2041-8205/807/2/L21
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