AAS 200th meeting, Albuquerque, NM, June 2002
Session 74. Stellar Atmospheres and Circumstellar Material
Display, Thursday, June 6, 2002, 9:20am-4:00pm, SW Exhibit Hall

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[74.05] A Search for Astrospheric Ly\alpha Emission Around 40~Eri~A

B.E. Wood, J.L. Linsky (JILA, Univ. of Colorado), H.-R. Müller (Bartol Research Institute), G.P. Zank (IGPP, Univ. of California at Riverside)

Hydrodynamic models of our heliosphere predict that the heliosphere should be filled with hot neutral hydrogen gas created by the collision between the solar wind and the surrounding interstellar medium. In UV spectra from the Hubble Space Telescope (HST), heliospheric H~I Ly\alpha absorption from this hot H~I has been detected. Absorption from analogous ``astrospheric'' H~I surrounding many other solar-like stars has also been detected. In principle, this astrospheric H~I previously seen only in absorption might also be observable in emission, since the H~I will scatter stellar Ly\alpha photons. We report on an attempt using HST to detect astrospheric Ly\alpha emission around the nearby K1~V star 40~Eri~A, for which a tentative detection of astrospheric H~I absorption already exists.

This work is supported by NASA grant NAG5-9041, and through grant GO-08237.01-A from STScI.

The author(s) of this abstract have provided an email address for comments about the abstract: woodb@origins.colorado.edu

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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.