Determining Coronal Structure in Active Binary Stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The geometric and thermal structure of coronae is a fundamental problem of the astrophysics of stellar activity. We can indirectly derive characteristic coronal extent using emission measures and densities as determined from plasma diagnostics. With the resolution of the Chandra HETGS, we can also begin to measure velocity variations. In conjunction with X-ray light curves, we can more directly constrain the structure of the emitting plasma. This is similar to optical Doppler image reconstruction which probes the lower atmosphere in detail, due to availability of much higher quality data. We will examine some results from HETGS spectroscopy of bright, short-period W UMa and RS CVn binaries, such as VW Cep, 44 Boo, and ER Vul.

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