A dataset provided by the European Space Agency

Name 055222
Title Wolf-Rayet 1: A Study of X-ray Production from a Structured and Massive Wind
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0552220101

DOI 10.5270/esa-rbdqxe0
Author Dr Richard Ignace
Description Our target is the nitrogen-rich Wolf-Rayet (WR) star (= HD4004) that has recently been shown to display line-profile variability with a period of 7.7 days, similar in nature to the 3.8 day period variability long known for WR6 (= EZ CMa = HD50896). For neither star is binarity thought to be the culprit of the periodic variability; instead, large scale wind asymmetry is invoked. We are requesting three 20 ksec EPIC pointings of WR1, roughly equally spaced in phase. We seek to detect X-ray variability as a means of characterizing the nature of the globally coherent wind structure.
Publication New X-Ray Detections of WNL Stars . Skinner, Stephen L., Zhekov, Svetozar A., et all. . AJ . 143-116 . 2012 . 2012AJ....143..116S ,
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift . Yershov, V. N., . Ap&SS . 354-97 . 2014 . 2014Ap&SS.354...97Y ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2009-02-04T21:24:18Z/2009-02-05T04:42:21Z
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 2010-03-06T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2010-03-06T00:00:00Z, 055222, 17.56_20190403_1200. https://doi.org/10.5270/esa-rbdqxe0