Observations of the Outer Heliosphere and Astrospheres with HST

Details Observations of the Outer Heliosphere and Astrospheres with HST Observations of the Outer Heliosphere and Astrospheres with HST

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh21a..07w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH21A-07

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7539 Stellar Astronomy

Scientific paper

The interaction between the solar wind and interstellar medium creates a population of hot neutral hydrogen in the heliosphere that can be detected and studied with the Hubble Space Telescope (HST), since these neutrals produce absorption in Lyman-α lines observed by HST from nearby stars. Analogous absorption from neutrals within the astrospheres surrounding the observed stars is also detectable. The Lyman-α absorption signature works only for solar-like stars, but for the red giant α~Tau there is a Mg~II absorption signature that is also believed to be astrospheric. I review some of what we have learned recently from the HST observations of heliospheric and astrospheric absorption.

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