The Diagnostic Potential of Heliospheric and Astrospheric H~I Lyα Absorption Detected by HST

Astronomy and Astrophysics – Astronomy

Scientific paper

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7539 Stellar Astronomy, 7549 Ultraviolet Emissions, 2124 Heliopause And Solar Wind Termination, 2144 Interstellar Gas, 2151 Neutral Particles

Scientific paper

The collision between the solar wind and the local interstellar medium (LISM) creates a population of hot hydrogen gas that permeates the heliosphere. Absorption from this heliospheric hydrogen has been detected in Hubble Space Telescope (HST) observations of the H~I Lyα lines of nearby stars. Not only that, but absorption from ``astrospheric'' hydrogen surrounding the stars has also been detected. The heliospheric H~I absorption provides contraints on the properties of the LISM surrounding the Sun. The astrospheric H~I absorption provides constraints on the stellar wind properties of the observed stars, representing the first opportunity to study solar-like winds around other stars. These stellar wind studies of stars of varying ages and activity levels can also lead to estimates of the mass loss history of the Sun.

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