SIMBAD references

2013MNRAS.433.1789D - Mon. Not. R. Astron. Soc., 433, 1789-1795 (2013/August-2)

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

DE FREITAS D.B. and DE MEDEIROS J.R.

Abstract (from CDS):

The pioneering study by Skumanich showed that the rotational velocity of G-type main-sequence (MS) stars decreases with stellar age according to <v sini> ∝ 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.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): stars: evolution - stars: rotation - stars: statistics

Simbad objects: 2

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2019.12.14-03:09:07

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