Doppler Imaging of WR140's Collisionless Shocks at Apastron

Astronomy and Astrophysics – Astronomy

Scientific paper

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Chandra Proposal Id #06200506

Scientific paper

The Chandra observation of WR140 at its X-ray brightest just before the periastron passage of 2001-02-05 revealed direct evidence of a plasma out of equilibrium after collisionless shock heating. A similar observation 4 years later at apastron will sample the opposite extreme of physical conditions encountered by the shocks. With densities more than 200 times lower expected and cooler ions flowing into the shock, Compton relaxation and ionization evolution should proceed more slowly, so that not only will the line shapes map the flow of gas in the new geometry but should be much cooler. This may explain the hitherto unexplained phase variability of the Fe lines detected by ASCA.

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