New Mass-Loss Measurements from Astrospheric Lyα Absorption | Zendy

Brian E. Wood | Zendy; HansReinhard Müller | Zendy; G. P. Zank | Zendy; Jeffrey L. Linsky | Zendy; Seth Redfield | Zendy

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New Mass-Loss Measurements from Astrospheric Lyα Absorption

Author(s) -

Brian E. Wood,

HansReinhard Müller,

G. P. Zank,

Jeffrey L. Linsky,

Seth Redfield

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/432716

Subject(s) - astrophysics , stars , starspot , physics , solar wind , coronal hole , coronal mass ejection , astronomy , polar , corona (planetary geology) , atmospheric sciences , magnetic field , astrobiology , venus , quantum mechanics

Measurements of stellar mass loss rates are used to assess how wind strengthvaries with coronal activity and age for solar-like stars. Mass loss generallyincreases with activity, but we find evidence that winds suddenly weaken at acertain activity threshold. Very active stars are often observed to have polarstarspots, and we speculate that the magnetic field geometry associated withthese spots may be inhibiting the winds. Our inferred mass-loss/age relationrepresents an empirical estimate of the history of the solar wind. This resultis important for planetary studies as well as solar/stellar astronomy, sincesolar wind erosion may have played an important role in the evolution ofplanetary atmospheres.Comment: 12 pages, 3 figures, AASTEX v5.0 plus EPSF extensions in mkfig.sty; accepted by ApJ Letter

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