Do Carbon-rich Wolf-Rayet Stars Emit X-rays ?

Details Do Carbon-rich Wolf-Rayet Stars Emit X-rays ? Do Carbon-rich Wolf-Rayet Stars Emit X-rays ?

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1384z&link_type=abstract

Chandra Proposal ID #05200178

Computer Science

Chandra Proposal Id #05200178

Scientific paper

We propose to conduct a sensitive search for X-ray emission in four of the closest known carbon-rich (WC) Wolf-Rayet stars. Our primary objective is to determine if single WC stars without companions are X-ray emitters. Although it is often asserted that WC stars emit X-rays via shocks in their powerful winds, our archive search shows no convincing WC-star X-ray detections and a recent 16 ksec XMM observation of WR111 (WC5) resulted in a surprising non-detection. The high-opacity of carbon-rich winds or structural changes that occur in the terminal WC phase may lead to lower levels of X-ray emission than seen in their evolutionary precursors, the nitrogen-rich WN stars.

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