A dataset provided by the European Space Agency

Proposal ID 084435
Title Revisiting the Hyades (DA2+dK2) Eclipsing Binary V471 Tauri with XMM-Newton
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https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0844350101
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0844350201
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0844350301
DOI https://doi.org/10.5270/esa-na2jcyz
Principal Investigator, PI Prof Edward Guinan
Abstract We request 60 ks to secure XMM EPIC/OM-UV observations of the Hyades (DAZ+K2V)12.5-hr eclipsing binary V471 Tau. V471 Tau is an astrophysical lab for testingtheories of binary star evolution, stellar physics as well as hosting a probablebrown dwarf. We propose to capitalize on unique XMMs X-ray/UV capabilities tosecure simultaneous X-ray UV observations. These are crucial forcharacterizing the 9.25-min X-ray UV flux modulations seen previously. The X-UVvariations are theorized to arise from wind accretion on the WDs displacedmagnetic poles relative to its rotation poles. The WDs rotation period alsoserves as an independent clock to search for the Light Travel Time Effect fromthe movement of EB s barycenter by a brown dwarf. A 15.6-yr X-ray cycle will also be studied.
Publications
  • A confined dynamo: Magnetic activity of the K-dwarf component in the pre-cataclysmic binary system V471 Tauri |Ku0151vu00e1ri Zs. Kriskovics L. et al. | A&A | 650-158 | 2021 | 2021A&A...650A.158K | http://ui.adsabs.harvard.edu/#abs/2021A&A...650A.158K
  • X-Ray and Ultraviolet Observations of the Eclipsing Binary V471 Tauri with XMM-Newton: X-Ray-Cycles Eclipse Timings and Further Evidence of a Substellar Tertiary Companion |Chiodo Grace Guinan Edward et al. | RNAAS | 6-94 | 2022 | 2022RNAAS...6...94C | http://ui.adsabs.harvard.edu/#abs/2022RNAAS...6...94C
  • 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
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2019-09-04T13:00:41Z/2019-09-05T16:01:04Z
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 2020-12-20T23:00:00Z
Last Update 2025-01-27
Keywords "probable brown dwarf", "xmm newton", "binary star evolution", "rotation poles", "x uv variations", "stellar physics", "brown dwarf", "secure xmm epic", "testing theories", "yr xray cycle", "hyades da2", "hyades daz", "om uv", "EPIC", "XMM-Newton", "astrophysical lab", "wind accretion", "wds rotation period", "v471 tau", "XMM"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Prof Edward Guinan, 2020, 'Revisiting the Hyades (DA2+dK2) Eclipsing Binary V471 Tauri with XMM-Newton', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-na2jcyz