Implications of Recent Stellar Wind Measurements
Abstract
Very recent measurements of stellar winds are used to update relations between winds and coronal activity. New wind constraints include an upper limit of (M)over dot < 0.1 (M)over dot(circle 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 (M)over dot = 10 (M)over dot(circle 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 (M)over dot approximate to 0.06 (M)over dot(circle 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 09, 2018
- Accession Number
- AD1104613
Entities
People
- Brian E Wood
Organizations
- United States Naval Research Laboratory