Implications of Recent Stellar Wind Measurements
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
Pagination or Media Count:
Very recent measurements of stellar winds are used to update relations between winds and coronal activity. New wind constraints include an upper limit of Mover dot 0.1 Mover dotcircle dot for tau Ceti G8 V, derived from a nondetection of astrospheric H I Lyman-cr 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 Mover dot 10 Mover dotcircle dot for delta Pav G8 IV from astrospheric Lyman alpha a absorption suggests stronger winds for subgiants than for main sequence stars of equivalent activity. A very low mass-loss rate of Mover dot approximate to 0.06 Mover dotcircle dot recently estimated for GJ 436 M3 V from Lyman-cr absorption from an evaporating exoplanetary atmosphere implies inactive M dwarfs may have weak winds compared with GK dwarfs of similar activity.