| Proposal ID | 020120 |
| Title | THE NATURE OF THE ACCRETING OBJECT IN HD 161103 AND SAO 49725 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0201200101 |
| DOI | https://doi.org/10.5270/esa-eerp0yo |
| Principal Investigator, PI | Dr CHRISTIAN MOTCH |
| Abstract | ROSAT observations have shown that the Be stars HD 161103 and SAO 49725 exhibitan excess of X-ray emission over the normal shocked wind component. Therelatively modest X-ray luminosity of about 1 to 5 E32 erg/s (0.2-2.4 keV) isconsistent with that expected from a white dwarf accreting from the equatorialdisc 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 hasever been confirmed so far. This absence casts some doubts on our currentunderstanding of massive X-ray binary evolution. The goal of the proposedobservation is to characterize the X-ray spectral and temporal properties ofthese X-ray emitters and search for the signatures of an accreting white dwarf. |
| Publications |
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| 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 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 | 2008-01-11T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "white dwarf system", "xray spectral", "stars hd 161103", "e32 erg", "models predict", "xray emission", "HD 161103", "sao 49725 exhibit", "accreting object", "temporal properties", "absence casts", "hd 161103", "neutron star binary", "accreting white dwarf", "white dwarf accreting", "ROSAT", "sao 49725", "equatorial disc", "xray emitters" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr CHRISTIAN MOTCH, 2008, 'THE NATURE OF THE ACCRETING OBJECT IN HD 161103 AND SAO 49725', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-eerp0yo |