New Mass Loss Measurements from Astrospheric Lyman-alpha Absorption

Details New Mass Loss Measurements from Astrospheric Lyman-alpha Absorption New Mass Loss Measurements from Astrospheric Lyman-alpha Absorption

2005-06-17

arxiv.org/abs/astro-ph/0506401v1

Astrophys.J.628:L143-L146,2005

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures, AASTEX v5.0 plus EPSF extensions in mkfig.sty; accepted by ApJ Letters

Scientific paper

10.1086/432716

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.

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