| Proposal ID | 067124 |
| Title | The fast-spinning ultra-massive white dwarf companion of HD 49798 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0671240901 |
| DOI | https://doi.org/10.5270/esa-8f8edsj |
| Principal Investigator, PI | Dr SANDRO MEREGHETTI |
| Abstract | HD49798/RXJ0648-4418 is an X-ray binary with unique properties: the primary staris the brightest known subdwarf of early spectral type, while the secondary isthe fastest rotating (P=13.2 s) and one of the most massive (M>1.2 Msun) whitedwarfs currently known. We propose a follow-up study to better understand theproperties of the X-ray emission and derive tighter constraints on the masses ofthis interesting post-common envelope binary. In addition, observations near thetime of the eclipse will provide for the first time information on the stellarwind properties of a hot subdwarf. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2011-05-02T13:10:57Z/2011-09-08T04:36:28Z |
| 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 | 2012-10-12T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "time information", "msun white dwarfs", "xray binary", "stellar wind properties", "envelope binary", "hot subdwarf", "primary star", "hd 49798", "fastest rotating", "spectral type", "xray emission", "tighter constraints", "rxj0648 4418" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr SANDRO MEREGHETTI, 2012, 'The fast-spinning ultra-massive white dwarf companion of HD 49798', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-8f8edsj |