New Mass-Loss Measurements from Astrospheric Lyα Absorption
New Mass-Loss Measurements from Astrospheric Lyα Absorption
复制标题
天体层 Lyα 吸收的新质量损失测量
DOI：
10.1086/432716
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
S. Redfield
中科院分区：
文献类型：
--
作者：
B. Wood;H. Mueller;G. Zank;J. Linsky;S. Redfield
恒星质量损失率的测量被用来评估风的强度如何随着日冕活动和类太阳恒星的年龄而变化。质量损失通常会随着活动的增加而增加，但我们发现有证据表明，风在一定的活动阈值时会突然减弱。经常观察到非常活跃的恒星有极星斑，我们推测与这些斑点相关的磁场几何形状可能会抑制风。我们推断的质量损失/年龄关系代表了太阳风历史的经验估计。这一结果对于行星研究和太阳/恒星天文学都很重要，因为太阳风侵蚀可能在行星大气的演化中发挥了重要作用。
Measurements of stellar mass-loss rates are used to assess how wind strength varies with coronal activity and age for solar-like stars. Mass loss generally increases with activity, but we find evidence that winds suddenly weaken at a certain activity threshold. Very active stars are often observed to have polar starspots, and we speculate that the magnetic field geometry associated with these spots may be inhibiting the winds. Our inferred mass-loss/age relation represents an empirical estimate of the history of the solar wind. This result is important for planetary studies as well as solar/stellar astronomy, since solar wind erosion may have played an important role in the evolution of planetary atmospheres.