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
License: https://creativecommons.org/licenses/by-nc/3.0/igo

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 New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 973-L6 \| 2024 \| 2024ApJ...973L...6D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...973L...6D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2015-03-23T05:42:37Z/2015-03-23T20:25:57Z
Version	21.51_20241115_1113
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
Last Update	2026-07-09
Keywords	"cepheid xray inventory", "stark contrast", "phased variability", "existing xmm data", "fuv emissions", "secret lives", "delta cep", "hst fuv spectroscopy", "cepheid zeta gem", "XMM", "HST", "enhanced xray activity", "pulsation induced shoc", "xmm data", "xray variability", "xray activity", "atmospheric heating mechanisms"
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', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-3izb1tp
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.