The Secret X-ray Lives of Cepheids: A New Frontier in X-ray Astronomy with XMM

Details The Secret X-ray Lives of Cepheids: A New Frontier in X-ray Astronomy with XMM The Secret X-ray Lives of Cepheids: A New Frontier in X-ray Astronomy with XMM

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop...98g&link_type=abstract

XMM-Newton Proposal ID #06037406

Physics

Stars, White Dwarfs, Solar System, Delta Cep, Beta Dor, V* L Car, X Sgr, Su Cas, Polaris

Scientific paper

Thanks to XMM Cycle 6+7 approved observations for our program, we are now immersed in a stellar mystery- why and how are Classical Cepheids producing X- rays? The 3 observed for us so far (Polaris, delta Cep & beta Dor) have been detected as X-ray sources - against previously held notions. Our recent XMM results mark the first unambiguous detections of Cepheids in X-rays. We now have 2 aims: obtain deeper spectra of d Cep & b Dor at different critical pulsation phases to understand how they produce X-rays - and to expand the database of Cepheid X-ray detections to different pulsation properties. We submit a Large Proposal of 8 observations (410-ksec). With its enhanced sensitivity (5-6x Chandra) and soft response (~0.15 keV), XMM is uniquely suited for the science goals of this proposal.

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