A dataset provided by the European Space Agency

Name 020624
Title THE CANONICAL SHORT PERIOD COLLIDING WIND BINARY V444 CYGNI
URL

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206240201
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206240301
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206240401
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206240501
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206240701
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0206240801

DOI https://doi.org/10.5270/esa-j32y5eo
Author Dr JULIAN PITTARD
Description We propose to observe the archetypical short-period colliding winds binary V444
Cygni (HD 193576) with XMM-Newton. V444 Cyg consists of a Wolf-Rayet (WR) star
with an OB companion (WN5+O6), in a 4.2 day orbit. It is one of the best studied
early-type binary systems and is the brightest eclipsing WR + O-star binary.
Previous ROSAT and ASCA observations show continuous and complicated X-ray
variability with eclipses when each star passes in front of the other. The
requested phase constrained observations will provide stringent testing of
colliding wind models, will determine the importance of anticipated physical
mechanisms such as radiative braking, and will more generally examine the
formation of X-rays in hot star winds.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2004-05-19T12:12:43Z/2004-10-28T04:56:40Z
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 2005-12-03T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr JULIAN PITTARD, 2005, 020624, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-j32y5eo