A dataset provided by the European Space Agency

Name: The Unusual Wolf-Rayet Star EZ CMa
Published: 2002-11-21T00:00:00Z

Proposal ID	009279
Title	The Unusual Wolf-Rayet Star EZ CMa
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0092790101
DOI	https://doi.org/10.5270/esa-eyxthw9
Principal Investigator, PI	Dr Stephen Skinner
Abstract	EZ CMa is one of the most unusual Wolf-Rayet stars known. It shows well-definedvariability in the optical/UV at a period of 3.77 days. The cause of the variability is not known, and it may be due either to binarity or corotatingstructures in the wind of a single star. We propose to obtain a hign S/N EPIC spectrum of EZ CMa, enabling us to search for the hotter plasma which should be present if it is a binary system and to constrain the nature of the companion. Previous ASCA observations suggest that such hotter plasma is present.
Publications	On the nature of Collinder 121: insights from the low-mass pre-main sequence \|Burningham, Ben, Naylor, Tim, et al. \| MNRAS \| 346-1143 \| 2003 \| 2003MNRAS.346.1143B \| http://ui.adsabs.harvard.edu/#abs/2003MNRAS.346.1143B XMM-Newton and Very Large Array Observations of the Variable Wolf-Rayet Star EZ Canis Majoris: Evidence for a Close Companion? \|Skinner, Stephen L., Zhekov, Svetozar A., et al. \| ApJ \| 579-764 \| 2002 \| 2002ApJ...579..764S \| http://ui.adsabs.harvard.edu/#abs/2002ApJ...579..764S Massive Stars and the Energy Balance of the Interstellar Medium. II. The 35 Msolar Star and a Solution to the Missing Wind Problem.. \|Freyer, Tim, Hensler, Gerhard, \| ApJ \| 638-262 \| 2006 \| 2006ApJ...638..262F \| http://ui.adsabs.harvard.edu/#abs/2006ApJ...638..262F Probing Wolf-Rayet Winds: Chandra/HETG X-Ray Spectra of WR 6 \|Huenemoerder, David P., Gayley, K. G., et al. \| ApJ \| 815-29 \| 2015 \| 2015ApJ...815...29H \| http://ui.adsabs.harvard.edu/#abs/2015ApJ...815...29H The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch, Eric W., \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F Classification of 4XMM-DR9 sources by machine learning \|Zhang, Yanxia, Zhao, Yongheng, \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez, Antonio C., \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R Robust constraints on feebly interacting particles using XMM-Newton \|Luque, Pedro De la Torre, Balaji, Shyam, \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque, Pedro De la Torre, Balaji, Shyam, \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque, Pedro, Balaji, Shyam, \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2001-10-29T21:28:52Z/2001-10-30T01:03:16Z
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	2002-11-21T00:00:00Z
Keywords	"wolf rayet stars", "ez cma", "binary system", "hotter plasma", "epic spectrum", "corotating structures", "single star", "EPIC", "defined variability"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Stephen Skinner, 2002, 'The Unusual Wolf-Rayet Star EZ CMa', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-eyxthw9