Proposal ID | 040118 |
Title | Anomalous Coronae of Yellow Giants and Supergiants |
Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0401180101 |
DOI | https://doi.org/10.5270/esa-lezl4jq |
Principal Investigator, PI | Dr Thomas Ayres |
Abstract | EPIC-pn spectra of X-ray deficient yellow giants and supergiants will explorewhy these stars display anomalous coronal behavior compared with cooler giantsonly slightly further advanced in their evolution. Among the class-III objects,the sharp transition in coronal properties on the way to helium flash might becaused by disruption of a fossil magnetosphere by a newly born solar-likedynamo. But, the class-I supergiants are post-flash, and a second deficiencymechanism likely applies, perhaps highly extended chromospheric envelopesobscuring X-rays from submerged magnetic loops. A key discriminator is thecoronal energy distribution, especially the presence of enhanced softabsorption. |
Publications |
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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 Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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 |
Keywords | "x ray deficient", "anomalous coronae", "submerged magnetic loops", "key discriminator", "born solar", "deficiency mechanism", "class iii objects", "coronal properties", "EPIC", "yellow giants", "enhanced soft absorption", "cooler giants", "sharp transition", "coronal energy distribution", "epic pn spectra", "helium flash", "post flash" |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Dr Thomas Ayres, 2008, 'Anomalous Coronae of Yellow Giants and Supergiants', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-lezl4jq |