A dataset provided by the European Space Agency

Name 050653
Title Understanding the on-off states in CAL 83
URL

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http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0506530301
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DOI 10.5270/esa-m024vk0
Author Dr Robert Schwarz
Description CAL 83 is the canonical close-binary supersoft X-ray source and also among the two rare systems to show repeated on-off X-ray states. These systematic changes are anti-correlated with the optical brightness and closely connected to processes occuring at near Eddington accretion rates. We propose an optically triggered XMM monitoring of CAL 83 through one X-ray bright state following its evolution with many short pointings (5 ksec each). This will provide new insight into the yet unknown physical mechanism behind the X-ray on-off states by testing three alternatives: (a) Luminosity changes at constant temperature that indicate a cessation of the shell burning; (b) Temperature changes due to variations of the effective radius of the white dwarf; (c) Absorption, e.g. by a variable wind.
Publication An XMM-Newton Survey of the Soft X-Ray Background. II. An All-Sky Catalog of Diffuse O VII and O VIII Emission Intensities . Henley, David B., Shelton, Robin L., . ApJS . 202-14 . 2012 . 2012ApJS..202...14H ,
Optical and X-ray properties of CAL 83 - I. Quasi-periodic optical and supersoft variability . Rajoelimanana, A. F., Charles, P. A., et all. . MNRAS . 432-2886 . 2013 . 2013MNRAS.432.2886R ,
Optical and X-ray properties of CAL 83 - II. An X-ray pulsation at &tilde67 s . Odendaal, A., Meintjes, P. J., et all. . MNRAS . 437-2948 . 2014 . 2014MNRAS.437.2948O ,
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift . Yershov, V. N., . Ap&SS . 354-97 . 2014 . 2014Ap&SS.354...97Y ,
Short-period X-ray oscillations in super-soft novae and persistent super-soft sources . Ness, J.-U., Beardmore, A. P., et all. . A&A . 578-39 . 2015 . 2015A&A...578A..39N ,
The population of X-ray supernova remnants in the Large Magellanic Cloud . Maggi, P., Haberl, F., et all. . A&A . 585-162 . 2016 . 2016A&A...585A.162M ,
The Interaction of the Fermi Bubbles with the Milky Way.s Hot Gas Halo . Miller, Matthew J., Bregman, Joel N., . ApJ . 829-9 . 2016 . 2016ApJ...829....9M ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33......,
An eLIMA model for the 67 s X-ray periodicity in CAL 83 . Odendaal, A., Meintjes, P. J., . MNRAS . 467-2797 . 2017 . 2017MNRAS.467.2797O ,
Identification of high-mass X-ray binaries selected from XMM-Newton observations of the LMC* . van Jaarsveld, N., Buckley, D. A. H., et all. . MNRAS . 475-3253 . 2018 . 2018MNRAS.475.3253V ,
X-Ray Luminosity and Size Relationship of Supernova Remnants in the LMC . Ou, Po-Sheng, Chu, You-Hua, et all. . ApJ . 863-137 . 2018 . 2018ApJ...863..137O ,
New optically identified supernova remnants in the Large Magellanic Cloud . Yew, Miranda, Filipoviu0107, Miroslav D., et all. . MNRAS . 500-2336 . 2021 . 2021MNRAS.500.2336Y ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2008-03-20T00:33:22Z/2009-05-30T20:49:23Z
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 2010-06-23T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2010-06-23T00:00:00Z, 050653, 17.56_20190403_1200. https://doi.org/10.5270/esa-m024vk0