A dataset provided by the European Space Agency

Name 050350
Title A Study of the Discontinuous Drop in X-ray Emission at Spectral Type B1


DOI 10.5270/esa-or3081d
Author Dr Wayne Waldron
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.
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B stars seen...
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, 2009-04-03T00:00:00Z, 050350, 17.56_20190403_1200. https://doi.org/10.5270/esa-or3081d