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G-star astropauses - A test for interstellar pressure
Frisch, P. C.
AA(Chicago Univ., IL)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 1, p. 198-206. (ApJ Homepage)
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NASA/STI Keywords:
G Stars, Interstellar Magnetic Fields, Solar Neighborhood, Stellar Motions, Stellar Winds, Heliosphere, Interstellar Matter, Stellar Systems
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Under the assumption of a solar system model, astropause radii are estimated for a sample of 70 G stars near the sun. G-star space velocities and trajectories are calculated. Three stars within 10 pc of the sun have predicted astropause radii larger than 6 arcsec. At least eight stars have traversed low interstellar pressure regions, similar to the path of the sun, over the last 4 Myr. The Galactic influences on these stellar systems thus may be similar to those on the solar system, providing a list of possibly attractive SETI targets. The closest star to the sun 4 Myr ago, in this restricted sample, was HD 147513. The relative dimensions of the astropause radii of G stars with space motions parallel and perpendicular to the surrounding interstellar magnetic field may vary by a factor of 2 and may ultimately yield quantitative estimates of interstellar magnetic field strength near the sun.

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