Lithium abundances and rotational behavior for bright giant stars

Aims.We study the links possibly existing between the lithium content of bright giant stars and their rotational velocity. Methods.We performed a spectral analysis of 145 bright giant stars (luminosity class II) spanning the spectral range from F3 to K5. All these stars have homogeneous rotational v...

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Principais autores:	Lèbre, A., de Laverny, P., Nascimento Júnior, José Dias do, de Medeiros, J. R.
Formato:	article
Idioma:	English
Publicado em:	EDP Sciences
Assuntos:	Stars - abundances Stars - evolution Stars - atmospheres Stars - rotation
Endereço do item:	https://repositorio.ufrn.br/jspui/handle/123456789/29002
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spelling	ri-123456789-290022020-05-24T09:21:19Z Lithium abundances and rotational behavior for bright giant stars Lèbre, A. de Laverny, P. Nascimento Júnior, José Dias do de Medeiros, J. R. Stars - abundances Stars - evolution Stars - atmospheres Stars - rotation Aims.We study the links possibly existing between the lithium content of bright giant stars and their rotational velocity. Methods.We performed a spectral analysis of 145 bright giant stars (luminosity class II) spanning the spectral range from F3 to K5. All these stars have homogeneous rotational velocity measurements available in the literature. Results.For all the stars of the sample, we provide consistent lithium abundances (ALi), effective temperatures (Teff), projected rotational velocity (), mean metallicity ([Fe/H]), stellar mass, and an indication of the stellar multiplicity. The gradual decrease in lithium abundance with Teff is confirmed for bright giant stars, and it points to a dilution factor that is at least as significant as in giant stars. From the F to K spectral types, the ALi spans at least three orders of magnitude, reflecting the effects of stellar mass and evolution on dilution. Conclusions.We find that the behavior of ALi as a function of in bright giant stars presents the same trend as is observed in giants and subgiants: stars with high ALi are moderate or fast rotators, while stars with low ALi show a wide range of values Aims.We study the links possibly existing between the lithium content of bright giant stars and their rotational velocity. Methods.We performed a spectral analysis of 145 bright giant stars (luminosity class II) spanning the spectral range from F3 to K5. All these stars have homogeneous rotational velocity measurements available in the literature. Results.For all the stars of the sample, we provide consistent lithium abundances (ALi), effective temperatures (Teff), projected rotational velocity (), mean metallicity ([Fe/H]), stellar mass, and an indication of the stellar multiplicity. The gradual decrease in lithium abundance with Teff is confirmed for bright giant stars, and it points to a dilution factor that is at least as significant as in giant stars. From the F to K spectral types, the ALi spans at least three orders of magnitude, reflecting the effects of stellar mass and evolution on dilution. Conclusions.We find that the behavior of ALi as a function of in bright giant stars presents the same trend as is observed in giants and subgiants: stars with high ALi are moderate or fast rotators, while stars with low ALi show a wide range of values 2020-05-19T17:22:25Z 2020-05-19T17:22:25Z 2005-11-16 article LÈBRE, A.; LAVERNY, P. de; NASCIMENTO JUNIOR, J. D. do; MEDEIROS, J. R. de. Lithium abundances and rotational behavior for bright giantstars. Astronomy & Astrophysics, [s.l.], v. 450, n. 3, p. 1173-1179, 19 abr. 2006. EDP Sciences. Disponível em: http://dx.doi.org/10.1051/0004-6361:20053485. Acesso em: 12 mai. 2020. Com permissão da As“Reproduzidotronomy & Astrophysics, © ESO”. 1678-765X 10.1051/0004-6361:20053485 https://repositorio.ufrn.br/jspui/handle/123456789/29002 en application/pdf EDP Sciences
institution	Repositório Institucional
collection	RI - UFRN
language	English
topic	Stars - abundances Stars - evolution Stars - atmospheres Stars - rotation
spellingShingle	Stars - abundances Stars - evolution Stars - atmospheres Stars - rotation Lèbre, A. de Laverny, P. Nascimento Júnior, José Dias do de Medeiros, J. R. Lithium abundances and rotational behavior for bright giant stars
description	Aims.We study the links possibly existing between the lithium content of bright giant stars and their rotational velocity. Methods.We performed a spectral analysis of 145 bright giant stars (luminosity class II) spanning the spectral range from F3 to K5. All these stars have homogeneous rotational velocity measurements available in the literature. Results.For all the stars of the sample, we provide consistent lithium abundances (ALi), effective temperatures (Teff), projected rotational velocity (), mean metallicity ([Fe/H]), stellar mass, and an indication of the stellar multiplicity. The gradual decrease in lithium abundance with Teff is confirmed for bright giant stars, and it points to a dilution factor that is at least as significant as in giant stars. From the F to K spectral types, the ALi spans at least three orders of magnitude, reflecting the effects of stellar mass and evolution on dilution. Conclusions.We find that the behavior of ALi as a function of in bright giant stars presents the same trend as is observed in giants and subgiants: stars with high ALi are moderate or fast rotators, while stars with low ALi show a wide range of values
format	article
author	Lèbre, A. de Laverny, P. Nascimento Júnior, José Dias do de Medeiros, J. R.
author_facet	Lèbre, A. de Laverny, P. Nascimento Júnior, José Dias do de Medeiros, J. R.
author_sort	Lèbre, A.
title	Lithium abundances and rotational behavior for bright giant stars
title_short	Lithium abundances and rotational behavior for bright giant stars
title_full	Lithium abundances and rotational behavior for bright giant stars
title_fullStr	Lithium abundances and rotational behavior for bright giant stars
title_full_unstemmed	Lithium abundances and rotational behavior for bright giant stars
title_sort	lithium abundances and rotational behavior for bright giant stars
publisher	EDP Sciences
publishDate	2020
url	https://repositorio.ufrn.br/jspui/handle/123456789/29002
work_keys_str_mv	AT lebrea lithiumabundancesandrotationalbehaviorforbrightgiantstars AT delavernyp lithiumabundancesandrotationalbehaviorforbrightgiantstars AT nascimentojuniorjosediasdo lithiumabundancesandrotationalbehaviorforbrightgiantstars AT demedeirosjr lithiumabundancesandrotationalbehaviorforbrightgiantstars
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Lithium abundances and rotational behavior for bright giant stars

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