A dataset provided by the European Space Agency

Name: The Secret (X-ray) Lives of Cepheids: Polaris, delta Cep and beta Dor
Published: 2009-06-07T00:00:00Z

Proposal ID	050314
Title	The Secret (X-ray) Lives of Cepheids: Polaris, delta Cep and beta Dor
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503140101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503140301 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503140401
DOI	https://doi.org/10.5270/esa-t2xot1h
Principal Investigator, PI	Dr Edward Guinan
Abstract	XMM observations of the bright Cepheids Polaris, delta Cep and beta Dor willsolve two important puzzles recently uncovered in Cepheids with Chandra andFUSE. Recently, with Chandra, we discovered Polaris, a low amplitude ClassicalCepheid, to be a soft, log Lx = 28.8 ergs/sec X-ray source. Archival FUSEspectra of Polaris and beta Dor contain prominent emission lines of C III 977and O VI 1032/1038, indicating hot plasma with temperatures of at least 500,000K. Although Chandra detected Polaris as an X-ray source, the 10-ksec ACIS-Iexposure is inadequate to definitively distinguish between the supergiantPolaris or a mid-F main sequence companion.
Publications	A revision of the X-ray absorption nature of BALQSOs \|Streblyanska A. Barcons X. et al. \| A&A \| 515-2 \| 2010 \| 2010A&A...515A...2S \| http://ui.adsabs.harvard.edu/#abs/2010A&A...515A...2S 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 The Spitzer Mid-infrared Active Galactic Nucleus Survey. I. Optical and Near-infrared Spectroscopy of Obscured Candidates and Normal Active Galactic Nuclei Selected in the Mid-infrared \|Lacy M. Ridgway S. E. et al. \| ApJS \| 208-24 \| 2013 \| 2013ApJS..208...24L \| http://ui.adsabs.harvard.edu/#abs/2013ApJS..208...24L 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 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 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 Selection of Compton-thick AGN from a hard photometric sample using XMM-Newton observations \|Mostafa Reham Guainazzi Matteo \| MNRAS \| 525-5080 \| 2023 \| 2023MNRAS.525.5080M \| http://ui.adsabs.harvard.edu/#abs/2023MNRAS.525.5080M 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 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	2008-02-23T21:51:13Z/2008-04-29T12:59:52Z
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	2009-06-07T00:00:00Z
Last Update	2025-01-27
Keywords	"archival fuse spectra", "log lx", "sec xray source", "xray source", "iii 977", "delta cep", "prominent emission lines", "definitively distinguish", "secret xray lives", "beta dor", "hot plasma", "vi 1032", "bright cepheids polaris", "supergiant polaris", "XMM", "main sequence companion"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Edward Guinan, 2009, 'The Secret (X-ray) Lives of Cepheids: Polaris, delta Cep and beta Dor', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-t2xot1h