GT-Alpha CrB is a binary system consisting of an X-ray dark A star and anX-ray luminous main-sequence mid-G star. Every 17.4 days, the A star eclipsesthe G star completely. The eclipse is ideal to infer the distribution of X-rayemitting plasma and to infer extent and structure of an active G-star corona.The proposed observation covers one full G star eclipse. The eclipse timing willbe combined with previous ROSAT and, if approved, future XMM observations tomeasure the general relativistic apsidal motion of the system. To avoid opticalcontamination, the EPICs will use the thick filter. One MOS and the pn use TIMING mode. This is a phase-critical observation. EPIC is the prime instrument.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2001-01-13T13:33:39Z/2001-08-27T14:37:29Z
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.
European Space Agency, Dr Albert Brinkman, 2015, 'GT Observations of Active Cool Stars: Alpha CrB', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-07e8e7g
