Name | 030564 |
Title | Exploring the X-ray emission of G-type giants spun up by accretion |
URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0305640201 |
DOI | https://doi.org/10.5270/esa-mxludos |
Author | Dr Kevin Briggs |
Description | 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 temperatures among 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 been spun up by accretion of material from the companion during its AGB phase. We find the X-ray emission of the optically-brightest example to be an order of magnitude lower than that of FK Com stars. We propose to observe the only two bright comparable systems to discover whether such a surprisingly inefficient magnetic dynamo is a general outcome of accretive spin-up. |
Publication | No observations found associated with the current proposal |
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 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 | 2007-02-10T00:00:00Z |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Dr Kevin Briggs, 2007, 030564, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-mxludos |