A dataset provided by the European Space Agency

Name: X-ray study of an enigmatic hard X-ray emitting normal B star
Published: 2009-06-10T00:00:00Z

Proposal ID	055605
Title	X-ray study of an enigmatic hard X-ray emitting normal B star
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0556050101
DOI	https://doi.org/10.5270/esa-brr394p
Principal Investigator, PI	Dr Christian Motch
Abstract	Our search for new Gamma-Cas analogs in the 2XMMp catalogue has led to thediscovery of very hard X-ray emission (kT ~ 7 keV) from an otherwise normalK=8.8 B2-3V star. The Log(Lx) of 32.4 is typical for Gamma-Cas analogs. However,the absence of any circumstellar disc, five years after the XMM observations,opens the possibility that the star is one of the wind accreting neutron starbinaries predicted by massive binary evolution theories. The discovery and studyof such a system would allow to test evolutionary models and quantify thecontribution of these systems to the overall population of accreting galacticsources. We propose to re-observe the source with XMM-Newton and obtainsimultaneous optical spectroscopy to determine its true nature.
Publications	An All-Sky Atlas of Radio/X-ray Associations \|Flesch E. \| PASA \| 27-283 \| 2010 \| 2010PASA...27..283F \| http://ui.adsabs.harvard.edu/#abs/2010PASA...27..283F Classification of X-Ray Sources in the XMM-Newton Serendipitous Source Catalog \|Lin Dacheng Webb Natalie A. \| ApJ \| 756-27 \| 2012 \| 2012ApJ...756...27L \| http://ui.adsabs.harvard.edu/#abs/2012ApJ...756...27L A systematic cross-search for radio/infrared counterparts of XMM- Newton sources \|Combi J. A. Albacete Colombo J. F. et al. \| Ap&SS \| 331-53 \| 2011 \| 2011Ap&SS.331...53C \| http://ui.adsabs.harvard.edu/#abs/2011Ap&SS.331...53C Automatic Classification of Time-variable X-Ray Sources \|Lo Kitty K. Farrell Sean et al. \| ApJ \| 786-20 \| 2014 \| 2014ApJ...786...20L \| http://ui.adsabs.harvard.edu/#abs/2014ApJ...786...20L The diversity of quasars unified by accretion and orientation \|Shen Yue Ho Luis C. \| Natur \| 513-210 \| 2014 \| 2014Natur.513..210S \| http://ui.adsabs.harvard.edu/#abs/2014Natur.513..210S 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 X-ray survey of the North-America and Pelican star-forming complex (NGC 7000/IC 5070) \|Damiani Francesco Pillitteri Ignazio \| A&A \| 602-115 \| 2017 \| 2017A&A...602A.115D \| http://ui.adsabs.harvard.edu/#abs/2017A&A...602A.115D 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
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2008-05-02T10:58:18Z/2008-05-02T18:43:31Z
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	2009-06-10T00:00:00Z
Last Update	2025-01-27
Keywords	"overall population", "b2 3v star", "circumstellar disc", "xmm newton", "otherwise normal", "optical spectroscopy", "accreting galactic sources", "XMM-Newton", "2xmmp catalogue", "x ray", "gamma cas analogs", "XMM", "test evolutionary models"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Christian Motch, 2009, 'X-ray study of an enigmatic hard X-ray emitting normal B star', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-brr394p