A dataset provided by the European Space Agency

Name: The Secret (X-ray) Lives of Cepheids: Probing the
Published: 2009-08-01T00:00:00Z

Proposal ID	055241
Title	The Secret (X-ray) Lives of Cepheids: Probing the
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0552410101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0552410401
DOI	https://doi.org/10.5270/esa-90q1p5g
Principal Investigator, PI	Dr Edward Guinan
Abstract	In this pilot study, XMM observations of the bright Cepheids Polaris, delta Cep,beta Dor and l Car will solve two important recently uncovered puzzles. FUSEspectra of Polaris and beta Dor display prominent emission lines of C III and OVI from hot plasma with T up to at least ~500,000 K. Moreover, the presence ofstrong emissions in the FUV (IUE/SWP) spectra of all four targets (C III, C IVand, in some cases, He II) makes a strong case that X-ray emitting plasmas mayalso be present. The contention that Cepheids are X-ray sources is furthersupported by their possible detections in the Copernicus archives (using theUCLXE instrument). Also, our recent Chandra observation discovered Polaris to bea soft X-ray source, but possibly contaminated by a nearby, early-mid dF companion.
Publications	Identifying XMM-Newton observations affected by solar wind charge exchange - Part II \|Carter J. A. Sembay S. \| A&A \| 527-115 \| 2011 \| 2011A&A...527A.115C \| http://ui.adsabs.harvard.edu/#abs/2011A&A...527A.115C Anchoring the Distance Scale via X-Ray/Infrared Data for Cepheid Clusters: SU Cas \|Majaess D. Turner D. G. et al. \| ApJ \| 753-144 \| 2012 \| 2012ApJ...753..144M \| http://ui.adsabs.harvard.edu/#abs/2012ApJ...753..144M Exospheric solar wind charge exchange as seen by XMM-Newton \|Carter J. A. Semba S. \| AN \| 333-313 \| 2012 \| 2012AN....333..313C \| http://ui.adsabs.harvard.edu/#abs/2012AN....333..313C The cosmological analysis of X-ray cluster surveys - II. Application of the CR-HR method to the XMM archive \|Clerc N. Sadibekova T. et al. \| MNRAS \| 423-3561 \| 2012 \| 2012MNRAS.423.3561C \| http://ui.adsabs.harvard.edu/#abs/2012MNRAS.423.3561C An XMM-Newton Survey of the Soft X-Ray Background. II. An All-Sky Catalog of Diffuse O VII and O VIII Emission Intensities \|Henley David B. Shelton Robin L. \| ApJS \| 202-14 \| 2012 \| 2012ApJS..202...14H \| http://ui.adsabs.harvard.edu/#abs/2012ApJS..202...14H An XMM-Newton Survey of the Soft X-Ray Background. III. The Galactic Halo X-Ray Emission \|Henley David B. Shelton Robin L. \| ApJ \| 773-92 \| 2013 \| 2013ApJ...773...92H \| http://ui.adsabs.harvard.edu/#abs/2013ApJ...773...92H Discovery of the Hard Spectrum VHE gamma-Ray Source HESS J1641-463 \|Abramowski A. Aharonian F. et al. \| ApJ \| 794-1 \| 2014 \| 2014ApJ...794L...1A \| http://ui.adsabs.harvard.edu/#abs/2014ApJ...794L...1A The Origin of the Hot Gas in the Galactic Halo: Testing Galactic Fountain Models X-Ray Emission \|Henley David B. Shelton Robin L. et al. \| ApJ \| 800-102 \| 2015 \| 2015ApJ...800..102H \| http://ui.adsabs.harvard.edu/#abs/2015ApJ...800..102H The population of X-ray supernova remnants in the Large Magellanic Cloud \|Maggi P. Haberl F. et al. \| A&A \| 585-162 \| 2016 \| 2016A&A...585A.162M \| http://ui.adsabs.harvard.edu/#abs/2016A&A...585A.162M 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 Interaction of the Fermi Bubbles with the Milky Ways Hot Gas Halo \|Miller Matthew J. Bregman Joel N. \| ApJ \| 829-9 \| 2016 \| 2016ApJ...829....9M \| http://ui.adsabs.harvard.edu/#abs/2016ApJ...829....9M SPIDERS: the spectroscopic follow-up of X-ray selected clusters of galaxies in SDSS-IV \|Clerc N. Merloni A. et al. \| MNRAS \| 463-4490 \| 2016 \| 2016MNRAS.463.4490C \| http://ui.adsabs.harvard.edu/#abs/2016MNRAS.463.4490C 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 Identification of high-mass X-ray binaries selected from XMM-Newton observations of the LMC* \|van Jaarsveld N. Buckley D. A. H. et al. \| MNRAS \| 475-3253 \| 2018 \| 2018MNRAS.475.3253V \| http://ui.adsabs.harvard.edu/#abs/2018MNRAS.475.3253V X-Ray Luminosity and Size Relationship of Supernova Remnants in the LMC \|Ou Po-Sheng Chu You-Hua et al. \| ApJ \| 863-137 \| 2018 \| 2018ApJ...863..137O \| http://ui.adsabs.harvard.edu/#abs/2018ApJ...863..137O 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 X-ray properties of the X-CLASS-redMaPPer galaxy cluster sample: the luminosity-temperature relation \|Molham Mona Clerc Nicolas et al. \| MNRAS \| 494-161 \| 2020 \| 2020MNRAS.494..161M \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.494..161M Multiwavelength classification of X-ray selected galaxy cluster candidates using convolutional neural networks \|Kosiba Matej Lieu Maggie et al. \| MNRAS \| 496-4141 \| 2020 \| 2020MNRAS.496.4141K \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.496.4141K SPIDERS: overview of the X-ray galaxy cluster follow-up and the final spectroscopic data release \|Clerc N. Kirkpatrick C. C. et al. \| MNRAS \| 497-3976 \| 2020 \| 2020MNRAS.497.3976C \| http://ui.adsabs.harvard.edu/#abs/2020MNRAS.497.3976C New optically identified supernova remnants in the Large Magellanic Cloud \|Yew Miranda Filipoviu0107 Miroslav D. et al. \| MNRAS \| 500-2336 \| 2021 \| 2021MNRAS.500.2336Y \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.500.2336Y Constraining the Milky Way Mass with Its Hot Gaseous Halo \|Guo Fulai Zhang Ruiyu \| ApJ \| 904-14 \| 2020 \| 2020ApJ...904L..14G \| http://ui.adsabs.harvard.edu/#abs/2020ApJ...904L..14G An X-Ray- and SZ-bright Diffuse Source toward M31: A Local Hot Bridge \|Qu Zhijie Huang Rui et al. \| ApJ \| 907-14 \| 2021 \| 2021ApJ...907...14Q \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...907...14Q 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 Solar Cycle Temporal Variation of the Solar Wind Charge Exchange X-Ray Lines \|Qu Zhijie Koutroumpa Dimitra et al. \| ApJ \| 930-21 \| 2022 \| 2022ApJ...930...21Q \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...930...21Q 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 Nonthermal X-Rays from Pulsation-driven Shocks in Cepheids \|Fraschetti Federico Anastasopoulou Konstantina et al. \| ApJ \| 944-62 \| 2023 \| 2023ApJ...944...62F \| http://ui.adsabs.harvard.edu/#abs/2023ApJ...944...62F 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	2008-06-05T14:26:02Z/2008-06-23T17:49:16Z
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	2009-08-01T00:00:00Z
Last Update	2025-01-27
Keywords	"fuse spectra", "soft xray source", "xray emitting plasmas", "swp spectra", "copernicus archives", "mid df companion", "uncovered puzzles", "delta cep", "secret xray lives", "beta dor", "ii makes", "hot plasma", "bright cepheids polaris", "xray sources", "uclxe instrument", "XMM", "fuv iue"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Edward Guinan, 2009, 'The Secret (X-ray) Lives of Cepheids: Probing the', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-90q1p5g