Implications of Recent Stellar Wind Measurements

Understand

Very recent measurements of stellar winds are used to update relations between winds and coronal activity.

• New wind constraints include an upper limit of Mdot<0.1 Mdot_sun for Tau Ceti (G8 V), derived from a nondetection of astrospheric H I Lyman-alpha 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 Mdot=10 Mdot_sun for Delta Pav (G8 IV) from astrospheric Lyman-alpha absorption suggests stronger winds for subgiants than for main sequence stars of equivalent activity.