| Name | 030183 |
| Title | The Oldest Cataclysmic Variables |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0301830101 |
| DOI | https://doi.org/10.5270/esa-fbbzmcg |
| Author | Prof Joseph Patterson |
| Description | Angular momentum loss grinds cataclysmic variables down to very short period on relatively short timescales (1-3 Gyr); then they should bounce at Porbvirgul80 min and begin evolving back to longer period. Since the Galaxy is 10 Gyr old, these period bouncers should now be extremely numerous. Unfortunately, none have yet been securely identified. We believe we have finally identified a few of these stars (5), based on their very low mass ratios. These stars are a newly recognized class of CV, and 1-10 keV X-rays appear to be a major part (about half) of their accretion luminosity budget. XMM observations would clarify the origin of the X-rays and probe physical conditions in the accreting gas, donated by a star which has been stripped down to 0.02-0.04 solar masses. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2005-06-16T08:17:45Z/2005-06-18T15:46:22Z |
| 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 | 2006-07-14T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Joseph Patterson, 2006, 030183, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-fbbzmcg |