A dataset provided by the European Space Agency

Name: HD45314 the first gamma Cas analog among Oe stars
Published: 2017-03-30T22:00:00Z

Proposal ID	076022
Title	HD45314 the first gamma Cas analog among Oe stars
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0760220601
DOI	https://doi.org/10.5270/esa-g170nil
Principal Investigator, PI	Prof Gregor Rauw
Abstract	In a previous XMM observation we discovered that the Oe star HD45314 belongs tothe group of so-called gamma Cas analogs. Its X-ray luminosity is about 10 timeshigher than that of normal OB stars and the X-ray spectrum is extremely hard,suggesting kT virgul 21keV. During the previous X-ray observation, simultaneousoptical spectra indicated that HD45314 was in a rather low emission state. Ourmonitoring of the optical spectrum of this star reveals huge variations in thestrengths of the emission lines which are diagnostics of the circumstellar disk.Since the most plausible scenarios for the gamma Cas phenomenon involve a stronginteraction with the circumstellar disk, we propose to reobserve HD45314 nexttime the star undergoes an outburst and/or in case its disk should clear away.
Publications	Intriguing X-ray and optical variations of the gamma Cassiopeiae analog HD 45314 \|Rauw, G., Naze, Y., et al. \| A&A \| 615-44 \| 2018 \| 2018A&A...615A..44R \| http://ui.adsabs.harvard.edu/#abs/2018A&A...615A..44R 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 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	2016-03-08T05:08:39Z/2016-03-08T13:45:19Z
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	2017-03-30T22:00:00Z
Keywords	"star undergoes", "normal ob stars", "xray luminosity", "gamma cas analog", "XMM", "optical spectrum", "xray spectrum", "circumstellar disk", "emission lines", "gamma cas phenomenon", "low emission", "oe stars", "reobserve hd45314", "optical spectra indicated"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Gregor Rauw, 2017, 'HD45314 the first gamma Cas analog among Oe stars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-g170nil