Implications of Recent Stellar Wind Measurements
Implications of Recent Stellar Wind Measurements
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最近恒星风测量的影响
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
B. Wood
中科院分区：
文献类型：
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作者：
B. Wood
最近对恒星风的测量被用来更新风和日冕活动之间的关系。新的风约束包括τ Ceti （G8 V）的上限Ṁ < 0.1 Ṁ⊙，这是由于未检测到天体大气层的H I Lyman-α吸收而得出的。本文首次报道了这一上限，它代表了利用天体吸收技术约束的最弱风。对来自星球莱曼α吸收的δ Pav （G8 IV）的高质量损失率Ṁ = 10 Ṁ⊙的测量表明，亚巨星的风比同等活动的主序星的风更强。最近估计gj436 （M3 V）从蒸发的系外行星大气中吸收莱曼α的质量损失率非常低，为Ṁ≈0.06 Ṁ⊙，这意味着与具有类似活动的GK矮星相比，不活跃的M矮星可能具有较弱的风。
Very recent measurements of stellar winds are used to update relations between winds and coronal activity. New wind constraints include an upper limit of Ṁ < 0.1 Ṁ⊙ for τ Ceti (G8 V), derived from a nondetection of astrospheric H I Lyman-α absorption. This upper limit is reported here for the first time, and represents the weakest wind constrained using the astrospheric absorption technique. A high mass loss rate measurement of Ṁ = 10 Ṁ⊙ for δ Pav (G8 IV) from astrospheric Lyman-α absorption suggests stronger winds for subgiants than for main sequence stars of equivalent activity. A very low mass-loss rate of Ṁ ≈ 0.06 Ṁ⊙ recently estimated for GJ 436 (M3 V) from Lyman-α absorption from an evaporating exoplanetary atmosphere implies inactive M dwarfs may have weak winds compared with GK dwarfs of similar activity.