The Secret X-ray Lives of Cepheids: Are Classical Cepheids X-ray Variables?

Details The Secret X-ray Lives of Cepheids: Are Classical Cepheids X-ray Variables? The Secret X-ray Lives of Cepheids: Are Classical Cepheids X-ray Variables?

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop..163g&link_type=abstract

XMM-Newton Proposal ID #06547801

Physics

Stars, White Dwarfs, Solar System, Polaris

Scientific paper

We are now immersed in the middle of a stellar mystery: why (and how) are Classical Cepheids producing X-rays? We propose phase-constrained & better exposed XMM observations in Cycle 9 to solve this mystery, and initiate a leap forward in our understanding of Cepheid atmospheres, pulsations, winds, shocks and internal structures. It is worth noting that: all three Cepheids observed to date by XMM have successfully been detected and, more importantly, our recent XMM results mark the first ever unambiguous X-ray detections of Cepheids. The major aim of this proposal is to obtain deeper XMM observations of two previously observed Cepheids (Polaris & beta Dor) at critical pulsation phases to understand the mechanism(s) by which they produce X-rays.

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