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 \|Nazu00e9 Yau00ebl 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
Last Update	2025-01-27
Keywords	"stable pulsation", "HD161103", "hard xray emission", "xmm newton", "magnetic interaction", "XMM-Newton", "white dwarf accreting", "major step forward", "gamma cas analogs", "cas analogs", "XMM", "star circumstellar disc", "periodic modulations", "gamma cas"
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