A dataset provided by the European Space Agency

Name: Classification of three enigmatic variable stars
Published: 2019-04-30T22:00:00Z

Proposal ID	080383
Title	Classification of three enigmatic variable stars
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0803830201
DOI	https://doi.org/10.5270/esa-w250tc0
Principal Investigator, PI	Dr Hauke Worpel
Abstract	Long-term optical monitoring campaigns such as the MACHO survey uncover many newvariable objects with intriguing light curves that warrant follow-upobservations in other wavelengths. We propose to use XMM-Newton to observe threeMACHO-identified variable stars whose optical light curves and spectra defy easyclassification. Two may be magnetic cataclysmic variable stars with atypicallyslow variability, and we have no plausible classification for the third. Allthree sources promise to increase our knowledge of the Galactic X-ray emissionin the direction of the Galactic center.
Publications	MACHO 311.37557.169: A VY Scl star \|W\\u00f6rpel, Hauke, Schwope, Axel D., et al. \| AN \| 341-283 \| 2020 \| 2020AN....341..283W \| http://ui.adsabs.harvard.edu/#abs/2020AN....341..283W 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	2018-04-11T08:00:50Z/2018-04-11T14:27:09Z
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	2019-04-30T22:00:00Z
Keywords	"atypically slow variability", "XMM", "intriguing light curves", "macho survey uncover", "galactic xray emission", "galactic center", "term optical", "XMM-Newton", "variable stars", "optical light curves", "enigmatic variable stars", "variable objects", "sources promise", "xmm newton"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Hauke Worpel, 2019, 'Classification of three enigmatic variable stars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-w250tc0