The Secret (X-ray) Lives of Cepheids: Polaris, delta Cep and beta Dor

Details The Secret (X-ray) Lives of Cepheids: Polaris, delta Cep and beta Dor The Secret (X-ray) Lives of Cepheids: Polaris, delta Cep and beta Dor

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop..116g&link_type=abstract

XMM-Newton Proposal ID #05031402

Computer Science

Stars, White Dwarfs, Solar System, Polaris, Beta Dor, Xmm-Newton Proposal 05031402

Scientific paper

XMM observations of the bright Cepheids Polaris, delta Cep and beta Dor will solve two important puzzles recently uncovered in Cepheids with Chandra and FUSE. Recently, with Chandra, we discovered Polaris, a low amplitude Classical Cepheid, to be a soft, log Lx = 28.8 ergs/sec X-ray source. Archival FUSE spectra of Polaris and beta Dor contain prominent emission lines of C III 977 and O VI 1032/1038, indicating hot plasma with temperatures of at least 500,000 K. Although Chandra detected Polaris as an X-ray source, the 10-ksec ACIS-I exposure is inadequate to definitively distinguish between the supergiant Polaris or a mid-F main sequence companion. With its high sensitivity (5-6x Chandra) and extended soft response (to ~0.15 keV), XMM (pn-- CCD) is well-suited for this proposal.

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