The winds of young Solar-type stars in Coma Berenices and Hercules-Lyra

被引:8
|
作者
Evensberget, D. [1 ]
Carter, B. D. [1 ]
Marsden, S. C. [1 ]
Brookshaw, L. [1 ]
Folsom, C. P. [2 ]
Salmeron, R. [1 ]
机构
[1] Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia
[2] Univ Tartu, Tartu Observ, Observatooriumi 1, EE-61602 Toravere, Tartumaa, Estonia
关键词
stars: magnetic field; stars: rotation; stars: solar-type; stars: winds; outflows; Sun: evolution; Sun: heliosphere; SURFACE MAGNETIC-FIELDS; ROTATIONAL EVOLUTION; ANGULAR-MOMENTUM; TRANSIT VARIABILITY; RADIO-EMISSION; STELLAR WINDS; ACTIVE STARS; TIME-SCALES; SPIN-DOWN; DOPPLER;
D O I
10.1093/mnras/stab3557
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present wind models of 10 young Solar-type stars in the Hercules-Lyra association and the Coma Berenices cluster aged around similar to 0.26 and similar to 0.58 Gyr, respectively. Combined with five previously modelled stars in the Hyades cluster, aged similar to 0.63 Gyr, we obtain a large atlas of 15 observationally based wind models. We find varied geometries, multi-armed structures in the equatorial plane, and a greater spread in quantities such as the angular momentum loss. In our models, we infer variation of a factor of similar to 6 in wind angular momentum loss (J) over dot and a factor of similar to 2 in wind mass-loss M based on magnetic field geometry differences when adjusting for the unsigned surface magnetic flux. We observe a large variation factor of similar to 4 in wind pressure for an Earth-like planet; we attribute this to variations in the 'magnetic inclination' of the magnetic dipole axis with respect to the stellar axis of rotation. Within our models, we observe a tight correlation between unsigned open magnetic flux and angular momentum loss. To account for possible underreporting of the observed magnetic field strength we investigate a second series of wind models where the magnetic field has been scaled by a factor of 5. This gives M alpha B-0.4 and (J) over dot alpha B-1.0 as a result of pure magnetic scaling.
引用
收藏
页码:5226 / 5245
页数:20
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