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Title: EVIDENCE FOR A WEAK WIND FROM THE YOUNG SUN

The early history of the solar wind has remained largely a mystery due to the difficulty of detecting winds around young stars that can serve as analogs for the young Sun. Here we report on the detection of a wind from the 500 Myr old solar analog π{sup 1} UMa (G1.5 V), using spectroscopic observations from the Hubble Space Telescope. We detect H I Lyα absorption from the interaction region between the stellar wind and interstellar medium, i.e., the stellar astrosphere. With the assistance of hydrodynamic models of the π{sup 1} UMa astrosphere, we infer a wind only half as strong as the solar wind for this star. This suggests that the Sun and solar-like stars do not have particularly strong coronal winds in their youth.
Authors:
 [1] ;  [2] ; ;  [3]
  1. Naval Research Laboratory, Space Science Division, Washington, DC 20375 (United States)
  2. Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755 (United States)
  3. Astronomy Department, Van Vleck Observatory, Wesleyan University, 96 Foss Hill Drive, Middletown, CT 06459 (United States)
Publication Date:
OSTI Identifier:
22364009
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 781; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; DETECTION; EMISSION SPECTRA; HYDRODYNAMICS; HYDROGEN; LYMAN LINES; SOLAR CORONA; SOLAR WIND; SPACE; SUN; TELESCOPES; ULTRAVIOLET RADIATION