A calibration of the Rossby number from asteroseismology

被引：30

作者：

Corsaro, E. ^{[1
]}

Bonanno, A. ^{[1
]}

Mathur, S. ^{[2
,3
]}

Garcia, R. A. ^{[4
]}

Santos, A. R. G. ^{[5
]}

Breton, S. N. ^{[4
]}

Khalatyan, A. ^{[6
]}

机构：

[1] INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy

[2] Inst Astrofis Canarias, Santa Cruz De Tenerife, Spain

[3] Univ La Laguna, Dept Astrophys, Santa Cruz De Tenerife, Spain

[4] Univ Paris Diderot, Sorbonne Paris Cite, Univ Paris Saclay, AIM,CEA,CNRS, F-91191 Gif Sur Yvette, France

[5] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[6] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 652卷

基金：

英国科学技术设施理事会;

关键词：

stars: activity; starspots; stars: rotation; asteroseismology; convection; methods: statistical; MAGNETIC-ACTIVITY; SOLAR-LIKE; PHOTOMETRIC VARIABILITY; SURFACE ROTATION; STELLAR ROTATION; KEPLER; STARS; SUN; OSCILLATIONS; CONNECTION;

D O I：

10.1051/0004-6361/202141395

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Stellar activity and rotation are tightly related in a dynamo process. Our understanding of this mechanism is mainly limited by our capability of inferring the properties of stellar turbulent convection. In particular, the convective turnover time is a key ingredient through the estimation of the stellar Rossby number, which is the ratio of the rotation period and the convective turnover time. In this work, we propose a new calibration of the (B-V) color index dependence of the convective turnover time, hence, of the stellar Rossby number. Our new calibration is based on the stellar structure properties inferred through the detailed modeling of solar-like pulsators using asteroseismic observables. We show the impact of this calibration via a stellar activity-Rossby number diagram by applying it to a sample of about 40 000 stars observed with Kepler and for which the values for the photometric activity proxy S-ph and surface rotation periods are available. Additionally, we provide a new calibration for the convective turnover time as function of the (G(BP)-G(RP)) color index for allowing applicability in the ESA Gaia photometric passbands.

引用

页数：5

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