A dataset provided by the European Space Agency

Name 086252


DOI https://doi.org/esa-[xxxxxxx]
Author Dr Raghvendra Sahai
Description Our X-ray surveys of UV-emitting AGB stars show that 40% of objects with FUV emission and FUV-NUV flux ratios >virgul0.2 have variable X-ray emission characterized by very high temperatures (Tx virgul 35-160 MK) and luminosities (Lx virgul 0.002-0.2 Lsun), indicating the presence of accretion associated with a close binary companion. However, the UV-emitting AGB star population is dominated by objects with little or no FUV emission, and we do not know whether the UV emission from these is intrinsic to the AGB star or extrinsic (i.e., due to binarity). We propose a small X-ray survey of NUV-bright AGB stars with low (<0.1) FUV-NUV flux ratios to help distinguish between intrinsic and extrinsic models of the puzzling high-energy emission of cool AGB stars.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2021-04-08T06:15:09Z/2021-04-16T01:55:58Z
Version 19.16_20210326_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 2022-05-18T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2022-05-18T00:00:00Z, 086252, 19.16_20210326_1200. https://doi.org/esa-[xxxxxxx]