A dataset provided by the European Space Agency

Name 040118
Title Anomalous Coronae of Yellow Giants and Supergiants


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