| Name | 072162 |
| Title | What Can Old Stars Tell Us About The Lives They Led? A Survey of Praesepe |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0721620101 |
| DOI | https://doi.org/10.5270/esa-02l86n2 |
| Author | Prof Marcel Agueros |
| Description | Measuring stellar rotation periods (Prot) and coronal and chromospheric emission in older open clusters is challenging, but essential to calibrate the age-activity-rotation relation that governs the evolution of low-mass and solar-mass stars. We propose 60 ksec observations of three fields in the old (virgul600 Myr) Praesepe open cluster. These observations will double the overall number of X-ray-detected cluster members and of detected members with measured Prot. These detections will a) calibrate LX as an age estimator for field stars; b) establish the dependence of (unsaturated) LX on Rossby number for old, slowly rotating stars; and c) combined with optical spectra, determine if chromospheric and coronal emission transition into the saturated regime at the same threshold. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2013-10-30T10:52:35Z/2013-10-31T06:49:15Z |
| 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 | 2014-11-15T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Marcel Agueros, 2014, 072162, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-02l86n2 |