Understanding angular momentum transport in red giants: the case of KIC 7341231

被引：80

作者：

Ceillier, T. ^{[1
]}

Eggenberger, P. ^{[2
]}

Garcia, R. A. ^{[1
]}

Mathis, S. ^{[1
]}

机构：

[1] Univ Paris Diderot, CNRS, CEA DSM IRFU SAp, Lab AIM Paris Saclay,Ctr Saclay, F-91191 Gif Sur Yvette, France

[2] Univ Geneva, Observ Geneva, CH-1290 Sauverny, Switzerland

来源：

ASTRONOMY & ASTROPHYSICS | 2013年 / 555卷

基金：

瑞士国家科学基金会;

关键词：

stars: rotation; stars: oscillations; stars: evolution; SOLAR-LIKE OSCILLATIONS; INTERNAL GRAVITY-WAVES; PRE-MAIN-SEQUENCE; STELLAR RADIATION ZONES; PROPER-MOTION STARS; LOW-MASS STARS; MAGNETIC-ACTIVITY; ROTATING STARS; ASTEROSEISMIC PROPERTIES; DIFFERENTIAL ROTATION;

D O I：

10.1051/0004-6361/201321473

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Thanks to recent asteroseismic observations, it has been possible to infer the radial differential rotation profile of subgiants and red giants. Aims. We want to reproduce the observed rotation profile of the early red giant KIC 7341231 through modeling and constrain the physical mechanisms responsible for angular momentum transport in stellar interiors. Methods. We computed models of KIC 7341231 including a treatment of shellular rotation, and we compared the rotation profiles obtained with the one derived from observations. We then modify some modeling parameters in order to quantify their effect on the obtained rotation profile. Moreover, we mimicked a powerful angular momentum transport during the main sequence and studied its effect on the evolution of the rotation profile during the subgiant and red giant phases. Results. We show that meridional circulation and shear mixing alone produce a rotation profile for KIC 7341231 that is too steep compared to the observed one. An additional mechanism is then needed to increase the internal transport of angular momentum. We find that this undetermined mechanism has to be efficient not only during the main sequence but also during the much quicker subgiant phase. Moreover, we point out the importance of studying the whole rotational history of a star to explain its rotation profile during the red giant evolution.

引用

页数：7

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