| Proposal ID | 080027 |
| Title | A Comprehensive Survey of Accretion in Double White Dwarfs |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0800270501 |
| DOI | https://doi.org/10.5270/esa-21sb8uf |
| Principal Investigator, PI | Prof Thomas Maccarone |
| Abstract | At the present time, the X-ray measurements of AM CVn stars (systems where onewhite dwarf accretes from another white dwarf) are heavily biased toward shortperiod systems. We propose to recitfy the situation by observing all AM CVnstars which do not have XMM observations in the archives but do have knownperiods. In fact, the X-ray measurements are more important for the long periodsystems than the short period systems, since in the long period systems, theboundary layers are expected to be optically thin, and a much larger fraction ofthe bolometric luminosity is expected to come out in X-rays, meaning that usingthese systems to test our understanding of evolution of double white dwarfsdepends crucially on knowing their X-ray fluxes. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2017-09-06T17:21:56Z/2018-04-16T17:47:59Z |
| 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 | 2019-05-09T22:00:00Z |
| Keywords | "boundary layers", "comprehensive survey", "short period systems", "bolometric luminosity", "XMM", "am cvn stars", "heavily biased", "white dwarf accretes", "period systems", "larger fraction", "white dwarf", "xray fluxes", "double white dwarfs", "xray measurements", "optically thin" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Thomas Maccarone, 2019, 'A Comprehensive Survey of Accretion in Double White Dwarfs', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-21sb8uf |