| Name | 055241 |
| Title | The Secret (X-ray) Lives of Cepheids: Probing the |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0552410101 |
| 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 |