| Proposal ID | 050511 |
| Title | A follow-up study of the colliding wind binary Cyg OB2 8a |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0505110301 |
| DOI | https://doi.org/10.5270/esa-byh57pf |
| Principal Investigator, PI | Dr Gregor Rauw |
| Abstract | We propose to observe the colliding wind binary Cyg OB2 #8a (O6If + O5.5III(f))for 3 x 20 ksec near specific orbital phases. Previous XMM-Newton observationsrevealed a modulation of the X-ray flux of this system. At the same time, theradio emission of Cyg OB2 #8a also undergoes a phase-locked variation. The jointanalysis of the variations in the X-ray and radio domains will provideunprecedented information on the interplay between colliding wind interactionsand the acceleration of relativistic particles that produce the non-thermalradio emission. The Cyg OB2 cluster further harbours a number of early-typestars (two of them are non-thermal radio emitters) that are bright X-raysources, as well as a wealth of secondary sources (most of them being low-mass PMS stars). |
| Publications |
|
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2007-04-29T16:23:01Z/2007-05-03T20:37:49Z |
| 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 | 2008-12-11T00:00:00Z |
| Last Update | 2025-08-04 |
| Keywords | "XMM", "colliding wind interactions", "XMM-Newton", "specific orbital phases", "cyg ob2 cluster", "radio emission", "xray flux", "xmm newton", "nonthermal radio emission", "cyg ob2", "type stars", "relativistic particles", "secondary sources", "radio domains", "phase locked variation", "bright xray sources", "8a o6if", "nonthermal radio emitters" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Gregor Rauw, 2008, 'A follow-up study of the colliding wind binary Cyg OB2 8a', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-byh57pf |