A dataset provided by the European Space Agency

Name: A search for a spinning white dwarf companion in Gamma-Cas-analogs
Published: 2010-03-26T00:00:00Z

Proposal ID	055100
Title	A search for a spinning white dwarf companion in Gamma-Cas-analogs
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0551000201
DOI	https://doi.org/10.5270/esa-k0029hp
Principal Investigator, PI	Dr Christian Motch
Abstract	The origin of the hard X-ray spectrum emitted by Gamma-Cas remains a puzzle.Both a white dwarf accreting from the Be star circumstellar disc or magneticinteraction between the photosphere and the disc can explain the unusually hardX-ray emission. The recent discovery of several new G-Cas analogs offers newopportunities to address this problem. XMM-Newton observations of two G-Casanalogs, HD161103 and HD119682 revealed evidences of periodic modulations of theX-ray flux apparently stronger than in G-Cas itself. We propose to re-observethese two sources in order to confirm or not the stability of the period.Establishing the presence of a stable pulsation in any of these G-Cas analogswould be a major step forward in our understanding of the whole class.
Publications	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 \| http://ui.adsabs.harvard.edu/#abs/2014Ap&SS.354...97Y An XMM-Newton view of FeKalpha in high-mass X-ray binaries \|Gimenez-Garcia, A., Torrejon, J. M., et al. \| A&A \| 576-108 \| 2015 \| 2015A&A...576A.108G \| http://ui.adsabs.harvard.edu/#abs/2015A&A...576A.108G 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 Contribution of a Non-Thermal Component to the X-Ray Emission of OB Stars \|Ryspaeva, E. B., Kholtygin, A. F., \| AstBu \| 75-127 \| 2020 \| 2020AstBu..75..127R \| http://ui.adsabs.harvard.edu/#abs/2020AstBu..75..127R 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 A possible nonthermal X-ray emission from \\u03b3 Cas analogues stars \|Ryspaeva, Elizaveta B., Kholtygin, Alexander F., \| OAst \| 30-132 \| 2021 \| 2021OAst...30..132R \| http://ui.adsabs.harvard.edu/#abs/2021OAst...30..132R X-ray response to disc evolution in two \\u03b3 Cas stars \|Naz\\u00e9, Ya\\u00ebl, Rauw, Gregor, et al. \| MNRAS \| 512-1648 \| 2022 \| 2022MNRAS.512.1648N \| http://ui.adsabs.harvard.edu/#abs/2022MNRAS.512.1648N 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	2009-03-06T10:55:31Z/2009-03-07T02:50:01Z
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	2010-03-26T00:00:00Z
Keywords	"cas analogs", "hard xray emission", "periodic modulations", "gamma cas", "XMM", "star circumstellar disc", "HD161103", "major step forward", "magnetic interaction", "gamma cas analogs", "XMM-Newton", "stable pulsation", "white dwarf accreting", "xmm newton"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Christian Motch, 2010, 'A search for a spinning white dwarf companion in Gamma-Cas-analogs', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-k0029hp