The winds of young Solar-type stars in the Hyades

The winds of young Solar-type stars in the Hyades
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毕星团中年轻太阳型恒星的风

DOI:
10.1093/mnras/stab1696
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发表时间:
2021
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
C. Folsom
C. Folsom
中科院分区:
--
文献类型:
--
作者:
D. Evensberget;B. Carter;S. Marsden;L. Brookshaw;C. Folsom

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随着太阳型恒星的老化,恒星风控制着它们的旋转,并在决定行星的可居住性方面发挥着重要作用,因为强大的风会导致大气侵蚀。我们使用TOUPIES测量恒星磁图和最先进的alfv<s:1>波浪驱动的风模型,计算了Hyades星团中五颗年轻的太阳型恒星的三维恒星风模型。这两颗恒星具有相同的0.6 Gyr年龄和相似的基本参数,我们通过采用未缩放和缩放(按5倍缩放)的场强来解释塞曼-多普勒成像固有的绝对场强的不确定性和低估。对于未缩放的磁场,产生的恒星风质量损失是今天太阳的2-4倍,角动量损失是今天太阳的2-10倍,缩放后的结果相应更大。我们将我们的结果与一系列已发表的风模型和alfv<s:1>波浪驱动模型进行比较,看到在“10 9 Md”处质量损失饱和的证据。
Stellar winds govern the spin-down of Solar-type stars as they age, and play an important role in determining planetary habitability, as powerful winds can lead to atmospheric erosion. We calculate three-dimensional stellar wind models for five young Solar-type stars in the Hyades cluster, using TOUPIES survey stellar magnetograms and state-of-the-art Alfvén wave driven wind modelling. The stars have the same 0.6 Gyr age and similar fundamental parameters, and we account for the uncertainty in and underestimation of absolute field strength inherent in Zeeman-Doppler imaging by adopting both unscaled and scaled (by a factor of five) field strengths. For the unscaled fields, the resulting stellar wind mass loss is 2–4 times greater and the angular momentum loss 2–10 times greater than for the Sun today, with the scaled results correspondingly greater. We compare our results with a range published of wind models and for the Alfvén wave driven modelling see evidence of mass loss saturation at „10 9 Md.
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