A dataset provided by the European Space Agency

Name: The Secret X-ray Lives of Cepheids: Are Classical Cepheids X-ray VariablesquestionMark
Published: 2011-05-21T00:00:00Z

Proposal ID	065478
Title	The Secret X-ray Lives of Cepheids: Are Classical Cepheids X-ray Variables?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0654780201
DOI	https://doi.org/10.5270/esa-l5aakro
Principal Investigator, PI	Prof Edward Guinan
Abstract	We are now immersed in the middle of a stellar mystery: why (and how) areClassical Cepheids producing X-rays? We propose phase-constrained & betterexposed XMM observations in Cycle 9 to solve this mystery, and initiate a leapforward in our understanding of Cepheid atmospheres, pulsations, winds, shocksand internal structures. It is worth noting that: all three Cepheids observed todate by XMM have successfully been detected and, more importantly, our recentXMM results mark the first ever unambiguous X-ray detections of Cepheids. Themajor aim of this proposal is to obtain deeper XMM observations of twopreviously observed Cepheids (Polaris & beta Dor) at critical pulsation phasesto understand the mechanism(s) by which they produce X-rays.
Publications	The Secret Lives of Cepheids: A Multi-Wavelength Study of the Atmospheres and Real-Time Evolution of Classical Cepheids \|Engle, Scott, \| PhDT \| 0-45 \| 2015 \| 2015PhDT........45E \| http://ui.adsabs.harvard.edu/#abs/2015PhDT........45E 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 The Secret Lives of Cepheids: delta Cep---The Prototype of a New Class of Pulsating X-Ray Variable Stars \|Engle, Scott G., Guinan, Edward F., et al. \| ApJ \| 838-67 \| 2017 \| 2017ApJ...838...67E \| http://ui.adsabs.harvard.edu/#abs/2017ApJ...838...67E X-Ray, UV and Optical Observations of Classical Cepheids: New Insights into Cepheid Evolution, and the Heating and Dynamics of Their Atmospheres \|Engle, Scott G., Guinan, Edward F., \| JASS \| 29-181 \| 2012 \| 2012JASS...29..181E \| http://ui.adsabs.harvard.edu/#abs/2012JASS...29..181E 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 X-Rays in Cepheids: Identifying Low-mass Companions of Intermediate-mass Stars \|Evans, Nancy Remage, Engle, Scott, et al. \| ApJ \| 938-153 \| 2022 \| 2022ApJ...938..153E \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...938..153E 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	2010-05-01T09:12:01Z/2010-05-01T19:43:10Z
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	2011-05-21T00:00:00Z
Keywords	"worth noting", "cepheid atmospheres", "XMM", "internal structures", "pulsation phases", "leap forward", "unambiguous xray detections", "phase constrained", "cepheids polaris", "secret xray lives", "beta dor", "exposed xmm", "deeper xmm"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Edward Guinan, 2011, 'The Secret X-ray Lives of Cepheids: Are Classical Cepheids X-ray VariablesquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-l5aakro