Our X-ray surveys of UV-emitting AGB stars show that 40% of objects with FUVemission and FUV/NUV flux ratios >virgul0.2 have variable X-ray emissioncharacterized by very high temperatures (Tx virgul 35-160 MK) and luminosities (Lx virgul0.002-0.2 Lsun), indicating the presence of accretion associated with a closebinary companion. However, the UV-emitting AGB star population is dominated byobjects with little or no FUV emission, and we do not know whether the UVemission from these is intrinsic to the AGB star or extrinsic (i.e., due tobinarity). 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 extrinsicmodels of the puzzling high-energy emission of cool AGB stars.
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 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.
European Space Agency, Dr Raghvendra Sahai, 2022, 'UNDERSTANDING THE HIGH_ENERGY openParUV X-RAYclosePar EMISSION FROM AGB STARS', 19.16_20210326_1200, European Space Agency, https://doi.org/10.57780/esa-7f7vp93
