A dataset provided by the European Space Agency

Name 084031
Title The impact of Be disks on the X-ray emission of gamma Cas stars


DOI https://doi.org/10.5270/esa-[xxxxxxx]
Author Prof Gregor Rauw
Description gamma Cas stars are Oe-Be stars that display an intriguing bright and hard X-ray emission. The origin of this X-ray emission could be either accretion by a compact companion or an interaction between the Be star and its decretion disk. Evidence favouring the latter scenario was obtained over recent years. This includes observations of a quasi-simultaneous decrease by a factor 10 of the X-ray emission of HD45314 as the disk of this star nearly dissipated in 2016. We aim at further constraining the gamma Cas phenomenon by taking advantage of such spectacular variations. For this purpose, we propose observing a gamma Cas star next time that its disk undergoes either an outburst or in case it clears away.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2019-08-26T07:23:28Z/2021-07-25T02:55:18Z
Version 19.17_20220121_1250
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 2022-08-10T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2022-08-10T00:00:00Z, 084031, 19.17_20220121_1250. https://doi.org/10.5270/esa-[xxxxxxx]