A dataset provided by the European Space Agency

Name: Evolution and X-ray activity of the four Hyades giants
Published: 2022-03-09T00:00:00Z

Proposal ID	086373
Title	Evolution and X-ray activity of the four Hyades giants
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0863730101 https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0863730201
DOI	https://doi.org/10.57780/esa-jmnw1k3
Principal Investigator, PI	Prof Juergen Schmitt
Abstract	The nearby Hyades cluster harbors four giants, which have almost identicaloptical appearances. However, the activity of these very similar stars differs,with two stars being active, while the stars HD28305 and HD27697 are inactive:The X-ray luminosities of these stars differ by more than a facor of 100! Anevolutionary study shows the former two at the beginning of their helium burningphase, while the latter two have already developed a carbon/oxygen core.Detailed X-ray spectroscopy is available for the two bright giants, yet none forthe two fainter giants, for which we propose deep XMM-Newton EPIC spectroscopy.We want to perform a detailed analysis of the X-ray spectra, search for spectraldifferences and relate them to the different states of activity and stellar evolution.
Publications	The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez Antonio C. \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2021-02-10T07:40:12Z/2021-02-15T16:04:41Z
Version	18.02_20200221_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	2022-03-09T00:00:00Z
Last Update	2025-01-27
Keywords	"EPIC", "stars differs", "stars hd28305", "xray spectroscopy", "helium burning phase", "oxygen core", "inactive \:", "XMM-Newton", "identical optical appearances", "fainter giants", "xray activity", "stellar evolution", "xray luminosities", "bright giants", "XMM", "xray spectra", "hyades giants"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Juergen Schmitt, 2022, 'Evolution and X-ray activity of the four Hyades giants', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-jmnw1k3