A non-extensive approach to the stellar rotational evolution – I: F- and G-type stars

Freitas, D. B. de; Medeiros, José Renan de

A non-extensive approach to the stellar rotational evolution – I: F- and G-type stars

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dc.contributor.author	Freitas, D. B. de
dc.contributor.author	Medeiros, José Renan de
dc.date.accessioned	2020-05-31T20:50:49Z
dc.date.available	2020-05-31T20:50:49Z
dc.date.issued	2013
dc.description.resumo	The pioneering study by Skumanich showed that the rotational velocity of G-type mainsequence (MS) stars decreases with stellar age according to v sin i ∝ t −1/2. This relationship is consistent with simple theories of angular momentum loss from rotating stars, where an ionized wind is coupled to the star by a magnetic field. The present study introduces a new approach to the study of stellar rotational braking in unsaturated F- and G-type stars limited in age and mass, connecting angular momentum loss by magnetic stellar wind with Tsallis non-extensive statistical mechanics. As a result, we show that the rotation–age relationship can be well reproduced using a non-extensive approach from Tsallis non-extensive models. Here, the index q, which is related to the degree of non-extensivity, can be associated with the dynamo process and to magnetic field geometry, offering relevant information on the level of stellar magnetic braking for F- and G-type MS stars.	pt_BR
dc.identifier.citation	FREITAS, D. B. de ; Medeiros, J. R. de . A non-extensive approach to the stellar rotational evolution - I: F- and G-type stars. Monthly Notices of the Royal Astronomical Society, v. 433, p. 1789-1795, 2013. Disponível em: https://academic.oup.com/mnras/article/433/3/1789/1213609. Acesso em: 25 Maio 2020. https://doi.org/10.1093/mnras/stt734	pt_BR
dc.identifier.doi	10.1093/mnras/stt734
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29106
dc.language	en	pt_BR
dc.publisher	Oxford University Press	pt_BR
dc.subject	Evolution – stars	pt_BR
dc.subject	Rotation – stars	pt_BR
dc.subject	Statistics	pt_BR
dc.title	A non-extensive approach to the stellar rotational evolution – I: F- and G-type stars	pt_BR
dc.type	article	pt_BR