| Proposal ID | 084091 |
| 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=0840910101 |
| DOI | https://doi.org/10.5270/esa-2ly098h |
| 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 overall data set will allow us to bring strongerconstraints on the X-ray emitting mechanism. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2019-03-22T10:19:37Z/2020-04-05T19:01:41Z |
| Version | 21.51_20241115_1113 |
| 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 | 2021-05-09T00:00:00Z |
| Last Update | 2026-06-19 |
| Keywords | "gamma cas analogs", "bring stronger constraints", "stars displaying", "luminosity intermediate", "magnetic activity", "overall data set", "normal massive stars", "rotating star", "local absorption", "neutron star binary", "white dwarf", "hard xray emission", "xray emitting mechanism", "variability patterns" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Christian Motch, 2021, 'Follow-up observations of Gamma-Cas analogs', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-2ly098h |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |