A dataset provided by the European Space Agency

Name 020120
Title THE NATURE OF THE ACCRETING OBJECT IN HD 161103 AND SAO 49725
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0201200101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0201200201

DOI 10.5270/esa-eerp0yo
Author Dr CHRISTIAN MOTCH
Description ROSAT observations have shown that the Be stars HD 161103 and SAO 49725 exhibit an excess of X-ray emission over the normal shocked wind component. The relatively modest X-ray luminosity of about 1 to 5 E32 erg-s (0.2-2.4 keV) is consistent with that expected from a white dwarf accreting from the equatorial disc of a Be star. Whereas models predict that they should outnumber Be + neutron star binaries by a factor of about 10, no Be + white dwarf system has ever been confirmed so far. This absence casts some doubts on our current understanding of massive X-ray binary evolution. The goal of the proposed observation is to characterize the X-ray spectral and temporal properties of these X-ray emitters and search for the signatures of an accreting white dwarf.
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An XMM-Newton S...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2003-12-09T20:31:41Z/2004-02-26T13:49:39Z
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 2008-01-11T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2008-01-11T00:00:00Z, 020120, 17.56_20190403_1200. https://doi.org/10.5270/esa-eerp0yo