A dataset provided by the European Space Agency

Name 080247
Title Identifying the Elusive Companions in AGB Binaries with Active Accretion


DOI https://doi.org/10.5270/esa-vhs273j
Author Dr Raghvendra Sahai
Description We have identified a sample of AGB stars that are candidates for having binary companions with active accretion, via an innovative technique to search for FUV excesses (fuvAGB stars). We have found variable X-ray emission characterized by very high temperatures (50-100 million K) and high luminosities in about 50% of our sample, implying the presence of variable accretion associated with a close binary companion. An exciting new result is that for one target (RR Umi) a dominant soft X-ray component is seen. We hypothesize that the latter is the expected coronal emission from the main-sequence companion: this hypothesis is supported 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.
Publication No observations found associated with the current proposal
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 Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2018-11-03T23:00:00Z, 080247, 17.56_20190403_1200. https://doi.org/10.5270/esa-vhs273j