A dataset provided by the European Space Agency

Name: X-Rays from Cepheids: Hints of Mass Loss?
Published: 2020-04-12T22:00:00Z

Proposal ID	082120
Title	X-Rays from Cepheids: Hints of Mass Loss?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0821200201
DOI	https://doi.org/10.5270/esa-i8i2s0x
Principal Investigator, PI	Dr Nancy Remage Evans
Abstract	Recent Cepheid X-ray observations have found the surprising result of increasedemission just after maximum radius, a pulsation phase when the photosphere isquiescent. Recent interferometric observations of Cepheids have foundcircumstellar envelopes (also surprising) which may be related and raisequestions of possible mass-loss and increased infrared (IR) flux which would beimportant in the use of the IR Leavitt (PL) relation for cosmology. Therequested XMM observation of the Cepheid V473 Lyr at the phase of maximum radiuswill provide a diagnostic of the elusive upper atmosphere activity, andspecifically the dependence on luminosity, mass, pulsation amplitude and mode.
Publications	X-Ray Observations of the Peculiar Cepheid V473 Lyr Identify A Low-mass Companion \|Evans Nancy Remage Pillitteri Ignazio et al. \| AJ \| 159-121 \| 2020 \| 2020AJ....159..121E \| http://ui.adsabs.harvard.edu/#abs/2020AJ....159..121E 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
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2019-03-17T05:33:17Z/2019-03-17T17:29:57Z
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	2020-04-12T22:00:00Z
Last Update	2025-01-27
Keywords	"increased emission", "mass loss ?.", "cepheid v473 lyr", "mass loss", "maximum radius", "x rays", "circumstellar envelopes", "cepheids \: hints", "pulsation phase", "XMM", "cepheid xray", "pulsation amplitude", "requested xmm"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Nancy Remage Evans, 2020, 'X-Rays from Cepheids: Hints of Mass Loss?', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-i8i2s0x