A dataset provided by the European Space Agency

Name: UNDERSTANDING THE HIGH_ENERGY (UV X-RAY) EMISSION FROM AGB STARS
Published: 2022-05-18T00:00:00Z

Proposal ID	086252
Title	UNDERSTANDING THE HIGH_ENERGY (UV X-RAY) EMISSION FROM AGB STARS
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0862520101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0862520701
DOI	https://doi.org/10.57780/esa-7f7vp93
Principal Investigator, PI	Dr Raghvendra Sahai
Abstract	Our X-ray surveys of UV-emitting AGB stars show that 40% of objects with FUVemission and FUV/NUV flux ratios >~0.2 have variable X-ray emissioncharacterized by very high temperatures (Tx ~ 35-160 MK) and luminosities (Lx ~0.002-0.2 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.
Publications	Understanding High-Energy (UV and X-ray) Emission from AGB Starsu2014Episodic Accretion in Binary Systems \|Sahai Raghvendra Sanz-Forcada Jorge et al. \| Galax \| 10-62 \| 2022 \| 2022Galax..10...62S \| http://ui.adsabs.harvard.edu/#abs/2022Galax..10...62S The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez Antonio C. \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R
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.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2022-05-18T00:00:00Z
Last Update	2025-01-27
Keywords	"nuv flux ratios", "fuv emission", "160 mk", "xray surveys", "uv emission", "energy emission", "extrinsic models", "temperatures tx", "agb stars", "close binary companion", "xray survey", "luminosities lx", "agb star", "cool agb stars"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Raghvendra Sahai, 2022, 'UNDERSTANDING THE HIGH_ENERGY (UV X-RAY) EMISSION FROM AGB STARS', 19.16_20210326_1200, European Space Agency, https://doi.org/10.57780/esa-7f7vp93