Proposal ID | 080247 |
Title | Identifying the Elusive Companions in AGB Binaries with Active Accretion |
Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0802470401 |
DOI | https://doi.org/10.5270/esa-vhs273j |
Principal Investigator, PI | Dr Raghvendra Sahai |
Abstract | We have identified a sample of AGB stars that are candidates for having binarycompanions with active accretion, via an innovative technique to search for FUVexcesses (fuvAGB stars). We have found variable X-ray emission characterized byvery high temperatures (50-100 million K) and high luminosities in about 50% ofour sample, implying the presence of variable accretion associated with a closebinary companion. An exciting new result is that for one target (RR Umi) adominant soft X-ray component is seen. We hypothesize that the latter is theexpected coronal emission from the main-sequence companion: this hypothesis issupported by RR Umi.s very low FUV variability. We propose to test our hypo-thesis with a pilot survey of fuvAGB stars with relatively low FUV variability. |
Publications |
|
Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
Temporal Coverage | 2017-10-12T14:49:34Z/2017-10-12T21:12:54Z |
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 | 2018-11-03T23:00:00Z |
Keywords | "agb stars", "elusive companions", "variable accretion", "target rr umi", "rr umi", "binary companions", "low fuv variability", "coronal emission", "hypo thesis", "pilot survey", "main sequence companion", "innovative technique", "fuvagb stars", "active accretion", "agb binary", "close binary companion" |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Dr Raghvendra Sahai, 2018, 'Identifying the Elusive Companions in AGB Binaries with Active Accretion', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-vhs273j |