| Name | 055605 |
| Title | X-ray study of an enigmatic hard X-ray emitting normal B star |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0556050101 |
| DOI | https://doi.org/10.5270/esa-brr394p |
| Author | Dr Christian Motch |
| Description | Our search for new Gamma-Cas analogs in the 2XMMp catalogue has led to the discovery of very hard X-ray emission (kT virgul 7 keV) from an otherwise normal K=8.8 B2-3V star. The Log(Lx) of 32.4 is typical for Gamma-Cas analogs. However, the absence of any circumstellar disc, five years after the XMM observations, opens the possibility that the star is one of the wind accreting neutron star binaries predicted by massive binary evolution theories. The discovery and study of such a system would allow to test evolutionary models and quantify the contribution of these systems to the overall population of accreting galactic sources. We propose to re-observe the source with XMM-Newton and obtain simultaneous optical spectroscopy to determine its true nature. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2008-05-02T10:58:18Z/2008-05-02T18:43:31Z |
| Version | 17.56_20190403_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 | 2009-06-10T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2009-06-10T00:00:00Z, 055605, 17.56_20190403_1200. https://doi.org/10.5270/esa-brr394p |