| Name | 078030 |
| Title | X-ray emission of extreme He stars |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0780300101 |
| DOI | https://doi.org/10.5270/esa-ir3aucm |
| Author | European Space Agency |
| Description | Radiation-driven winds are a common feature of hot stars, not only for massive stars but also for low-mass stars, which display weak winds. Massive stars are well known X-ray sources, in which the observed X-ray emission is attributed to turbulence and shocks in the strong winds. Although the winds of low-mass stars are significantly weaker, turbulence and shocks could be present also in this case and produce X-ray emission. Recently this was confirmed for two low-mass extreme He stars, BD+37 442 and BD+37 1977: in both cases the spectral properties are similar to those observed in massive stars. Now we propose to observe with XMM also other extreme He stars, which, although are characterized by rather different physical properties, have radiation-driven winds comparable to that of the previous sdO stars. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2016-09-18T15:09:20Z/2016-09-19T05:29:20Z |
| 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 | 2017-10-04T22:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2017, X-Ray Emission Of Extreme He Stars, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ir3aucm |