A dataset provided by the European Space Agency

Name 050314
Title The Secret (X-ray) Lives of Cepheids: Polaris, delta Cep and beta Dor


DOI https://doi.org/10.5270/esa-t2xot1h
Author Dr Edward Guinan
Description 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.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2008-02-23T21:51:13Z/2008-04-29T12:59:52Z
Version 17.56_20190403_1200
Mission Description The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations.
Since Earth's atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2009-06-07T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2009-06-07T00:00:00Z, 050314, 17.56_20190403_1200. https://doi.org/10.5270/esa-t2xot1h