| Name | 040118 |
| Title | Anomalous Coronae of Yellow Giants and Supergiants |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0401180101 |
| DOI | https://doi.org/10.5270/esa-lezl4jq |
| Author | Dr Thomas Ayres |
| Description | EPIC-pn spectra of "X-ray deficient" yellow giants and supergiants will explore why these stars display anomalous coronal behavior compared with cooler giants only slightly further advanced in their evolution. Among the class-III objects, the sharp transition in coronal properties on the way to helium flash might be caused by disruption of a "fossil" magnetosphere by a newly born solar-like dynamo. But, the class-I supergiants are post-flash, and a second deficiency mechanism likely applies, perhaps highly extended chromospheric envelopes obscuring X-rays from submerged magnetic loops. A key discriminator is the coronal energy distribution, especially the presence of enhanced soft absorption. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, RGS1, RGS2 |
| Temporal Coverage | 2006-11-24T21:39:49Z/2006-11-25T09:40:29Z |
| 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 | 2008-01-04T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2008-01-04T00:00:00Z, 040118, 17.56_20190403_1200. https://doi.org/10.5270/esa-lezl4jq |