| Proposal ID | 030564 |
| Title | Exploring the X-ray emission of G-type giants spun up by accretion |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0305640201 |
| DOI | https://doi.org/10.5270/esa-mxludos |
| Principal Investigator, PI | Dr Kevin Briggs |
| Abstract | Fast-rotation (v sin i of over 20 km/s) is rare among yellow (G2-K1) giants,restricted to tidally-synchronized binary components and the handful of FK Com-class single stars. Such stars have X-ray luminosities and plasma temperaturesamong the highest of known coronal sources. A number of yellow giants with v =100 km/s have been found as companions to hot subdwarfs. These stars have beenspun up by accretion of material from the companion during its AGB phase. Wefind the X-ray emission of the optically-brightest example to be an order ofmagnitude lower than that of FK Com stars. We propose to observe the only twobright comparable systems to discover whether such a surprisingly inefficientmagnetic dynamo is a general outcome of accretive spin-up. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2005-07-13T06:06:21Z/2006-01-19T07:08:40Z |
| 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 | 2007-02-10T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "fast rotation", "accretive spin", "magnitude lower", "plasma temperatures", "bright comparable systems", "coronal sources", "optically brightest example", "agb phase", "type giants spun", "yellow giants", "xray luminosities", "xray emission", "fk com stars", "hot subdwarfs" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Kevin Briggs, 2007, 'Exploring the X-ray emission of G-type giants spun up by accretion', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-mxludos |