X-Ray Doppler Imaging of Contact Binaries: the Partially Eclipsing VW CEP

Details X-Ray Doppler Imaging of Contact Binaries: the Partially Eclipsing VW CEP X-Ray Doppler Imaging of Contact Binaries: the Partially Eclipsing VW CEP

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop..763b&link_type=abstract

Chandra Proposal ID #03200569

Computer Science

Chandra Proposal Id #03200569

Scientific paper

Chandra LETG observations of the X-ray bright contact binary VW Cep will provide diagnostics of coronal structures under the extreme conditions of rapid rotation. Optical Doppler images of VW Cep have recently provided the first evidence for large polar spots on a contact binary, similar to polar spots observed on the less rapidly rotating RS CVn systems. We propose to exploit the unique spectral resolution of the LETG at long wavelengths to search for Doppler line shifts from the orbiting poles. Phase-resolved emission line intensity diagnostics for temperature, density, and abundances will complement the velocity measurements. This test for localized activity could definitively establish a new coronal phenomenon in fast rotators.

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