A dataset provided by the European Space Agency

Name: Follow-up observations of Gamma-Cas analogs
Published: 2022-02-09T00:00:00Z

Proposal ID	086065
Title	Follow-up observations of Gamma-Cas analogs
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0860650501
DOI	https://doi.org/10.57780/esa-ts7tbv5
Principal Investigator, PI	Dr Christian Motch
Abstract	Gamma-Cas analogs are early Be stars displaying very unusual hard X-ray emissionwith a luminosity intermediate between normal massive stars and XRBs. Both anunexpected magnetic activity in a critically rotating star, or accretion in a Be+ white dwarf (or neutron star) binary, have been invoked to account for theseoutstanding features. We request follow-up observations to better characterisethe high-energy properties (X-ray temperatures, local absorption and variabilitypatterns) of those Gamma-Cas analogs and candidate analogs lacking sensitiveenough observations. The new X-ray data together with the existing optical datawill allow us to bring stronger constraints on the X-ray emitting mechanism.
Publications	SRG/eROSITA survey of Be stars \|Naz\\u00e9, Ya\\u00ebl, Robrade, Jan, \| MNRAS \| 525-4186 \| 2023 \| 2023MNRAS.525.4186N \| http://ui.adsabs.harvard.edu/#abs/2023MNRAS.525.4186N Colliding winds in WR21 and WR31 - I. The X-ray view \|Naz\\u00e9, Ya\\u00ebl, Rauw, Gregor, et al. \| MNRAS \| 526-2167 \| 2023 \| 2023MNRAS.526.2167N \| http://ui.adsabs.harvard.edu/#abs/2023MNRAS.526.2167N 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	2021-01-24T04:00:52Z/2021-01-24T17:37:32Z
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	2022-02-09T00:00:00Z
Keywords	"existing optical data", "bring stronger constraints", "xray emitting mechanism", "hard xray emission", "xray data", "magnetic activity", "white dwarf", "neutron star binary", "normal massive stars", "gamma cas analogs", "luminosity intermediate", "local absorption", "stars displaying", "variability patterns", "rotating star"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Christian Motch, 2022, 'Follow-up observations of Gamma-Cas analogs', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-ts7tbv5