A dataset provided by the European Space Agency

Name: The Secret Lives of Cepheids: Exploring Cepheid X-ray Activity and Variability
Published: 2016-04-14T22:00:00Z

Proposal ID	074351
Title	The Secret Lives of Cepheids: Exploring Cepheid X-ray Activity and Variability
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0743510201
DOI	https://doi.org/10.5270/esa-3izb1tp
Principal Investigator, PI	Dr Edward Guinan
Abstract	We propose an XMM observation of the prototype of Classical Cepheids delta Cepto confirm X-ray variability. The data will complement our existing XMM data andHST FUV spectroscopy for this important star with well-defined, phasedvariability from 10,000 300,000 K plasmas, originating from pulsation-inducedshocks. We request one 65-ksec exposure of delta Cep to confirm enhanced X-rayactivity around 0.5p, observed in our previous XMM data. If confirmed, thephasing of the X-ray activity will stand in stark contrast to that of the FUVemissions, and provide important information on the atmospheric heatingmechanism(s) of this Cepheid. We also propose a 40-ksec observation of theCepheid zeta Gem to search for X-ray activity and expand the current Cepheid X-ray Inventory.
Publications	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 The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII, O VIII, and Fe L-shell Transitions \|Pan, Zeyang, Qu, Zhijie, et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P 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	2015-03-23T05:42:37Z/2015-03-23T20:25:57Z
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	2016-04-14T22:00:00Z
Keywords	"existing xmm data", "secret lives", "delta cep", "pulsation induced shoc", "XMM", "cepheid zeta gem", "xray variability", "xray activity", "cepheid xray inventory", "fuv emissions", "hst fuv spectroscopy", "phased variability", "atmospheric heating mechanisms", "stark contrast", "enhanced xray activity", "HST", "xmm data"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Edward Guinan, 2016, 'The Secret Lives of Cepheids: Exploring Cepheid X-ray Activity and Variability', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-3izb1tp