| Name | 050350 |
| Title | A Study of the Discontinuous Drop in X-ray Emission at Spectral Type B1 |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503500101 |
| DOI | https://doi.org/10.5270/esa-or3081d |
| Author | European Space Agency |
| Description | B supergiants display a discontinuous drop in X-ray emission along a dividing line in the H-R diagram (analogous to the one for K giants) which is referred to as the bistability jump at spectral type B1. Our XMM study of the X-ray properties on both sides of the jump have revealed several interesting results, but some uncertainties have arisen since B supergiant winds are thick to soft X-rays, and these winds are thought to be clumpy. We now have observational evidence that the bistabilty jump extends to the lower luminosity B giants which have lower wind densities. Hence, they do not have the problems that are associated with B supergiants. Therefore we are requesting XMM EPIC observations of 5 B giants to broaden our understanding of the B star dividing line. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2008-03-06T15:51:03Z/2008-03-12T22:06:49Z |
| 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 | 2009-04-03T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2009, A Study Of The Discontinuous Drop In X-Ray Emission At Spectral Type B1, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-or3081d |