A dataset provided by the European Space Agency

Name 086507
Title Arcturus and the origin of the coronal graveyard
URL

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0865070101

DOI https://doi.org/10.5270/esa-[xxxxxxx]
Author Dr Christian Schneider
Description Red giants like Arcturus occupy a region in the X-ray Hertzsprung-Russell Diagram (HRD) known as the coronal graveyard. The physical cause for the sharp decline of X-ray emission beyond a so-called dividing line that separates X-ray emitting yellow giants from X-ray dark red giants is, despite decades of research, not finally answered. The recent X-ray detection of Arcturus with Chandra HRC-I motivates our request to obtain spectral information with XMM-Newton EPIC spectroscopy. An 80 ks exposure is sufficient to detect large absorbing column densities that may be expected if severe obscuration by layers above the giant.s corona cause the decrease in their observed X-ray luminosity.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2021-01-09T12:35:48Z/2021-01-10T11:55:08Z
Version 18.02_20200221_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 2022-02-06T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2022-02-06T00:00:00Z, 086507, 18.02_20200221_1200. https://doi.org/10.5270/esa-[xxxxxxx]