| Proposal ID | 084435 |
| Title | Revisiting the Hyades (DA2+dK2) Eclipsing Binary V471 Tauri with XMM-Newton |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0844350101 |
| 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 |
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| 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 | 2025-08-04 |
| Keywords | "hyades da2", "rotation poles", "x uv variations", "secure xmm epic", "XMM", "testing theories", "yr xray cycle", "v471 tau", "brown dwarf", "wind accretion", "wds rotation period", "astrophysical lab", "xmm newton", "binary star evolution", "XMM-Newton", "probable brown dwarf", "EPIC", "stellar physics", "om uv", "hyades daz" |
| 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 |