A dataset provided by the European Space Agency

Name 055241
Title The Secret (X-ray) Lives of Cepheids: Probing the


DOI https://doi.org/10.5270/esa-90q1p5g
Author Dr Edward Guinan
Description In this pilot study, XMM observations of the bright Cepheids Polaris, delta Cep, beta Dor and l Car will solve two important recently uncovered puzzles. FUSE spectra of Polaris and beta Dor display prominent emission lines of C III and O VI from hot plasma with T up to at least virgul500,000 K. Moreover, the presence of strong emissions in the FUV (IUE-SWP) spectra of all four targets (C III, C IV and, in some cases, He II) makes a strong case that X-ray emitting plasmas may also be present. The contention that Cepheids are X-ray sources is further supported by their possible detections in the Copernicus archives (using the UCLXE instrument). Also, our recent Chandra observation discovered Polaris to be a soft X-ray source, but possibly contaminated by a nearby, early-mid dF companion.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2008-06-05T14:26:02Z/2008-06-23T17:49:16Z
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 2009-08-01T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2009-08-01T00:00:00Z, 055241, 17.56_20190403_1200. https://doi.org/10.5270/esa-90q1p5g