| Proposal ID | 055546 |
| Title | The unique system HD49798-RXJ0648 a post spiral-in and common-envelope binary |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0555460201 |
| DOI | https://doi.org/10.5270/esa-dk1wafg |
| Principal Investigator, PI | Dr Andrea Tiengo |
| Abstract | HD49798-RXJ0648 is a unique spectroscopic binary containing a 13 s X-raypulsating star accreting from an early type sub-dwarf. Although predicted byevolutionary models of common envelope spiral-in, no other system of this kindis currently known. The next important step, objective of this proposal, is todetermine if the compact star is a neutron star or, as it seems more likely, awhite dwarf. In the latter case the 13 s spin period would be the shortest knownfor a white dwarf, implying a large accreted mass and making this system thewhite dwarf analogous of LMXRBs containing millisecond pulsars. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2008-05-10T21:07:29Z/2008-05-11T09:19:27Z |
| Version | 21.51_20241115_1113 |
| 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 | 2009-06-19T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "envelope spiral", "neutron star", "white dwarf", "spectroscopic binary", "spin period", "white dwarf analogous", "system hd49798 rxj0648", "hd49798 rxj0648", "type sub dwarf", "accreted mass", "millisecond pulsars", "evolutionary models", "compact star", "envelope binary", "post spiral" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Andrea Tiengo, 2009, 'The unique system HD49798-RXJ0648 a post spiral-in and common-envelope binary', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-dk1wafg |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |