Asteroseismic Signatures of Stellar Magnetic Activity Cycles

Details Asteroseismic Signatures of Stellar Magnetic Activity Cycles Asteroseismic Signatures of Stellar Magnetic Activity Cycles

2007-04-12

arxiv.org/abs/0704.1606v1

Mon.Not.Roy.Astron.Soc.Lett.379:L16-L20,2007

Astronomy and Astrophysics

Astrophysics

5 pages including 3 figures and 1 table, MNRAS Letters accepted

Scientific paper

10.1111/j.1745-3933.2007.00325.x

Observations of stellar activity cycles provide an opportunity to study magnetic dynamos under many different physical conditions. Space-based asteroseismology missions will soon yield useful constraints on the interior conditions that nurture such magnetic cycles, and will be sensitive enough to detect shifts in the oscillation frequencies due to the magnetic variations. We derive a method for predicting these shifts from changes in the Mg II activity index by scaling from solar data. We demonstrate this technique on the solar-type subgiant beta Hyi, using archival International Ultraviolet Explorer spectra and two epochs of ground-based asteroseismic observations. We find qualitative evidence of the expected frequency shifts and predict the optimal timing for future asteroseismic observations of this star.

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