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
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503500101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0503500201

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.
Publication The XMM Cluster Survey: optical analysis methodology and the first data release . Mehrtens, Nicola, Romer, A. Kathy, et all. . MNRAS . 423-1024 . 2012 . 2012MNRAS.423.1024M ,
The XMM Cluster Survey: X-ray analysis methodology . Lloyd-Davies, E. J., Romer, A. Kathy, et all. . MNRAS . 418-14 . 2011 . 2011MNRAS.418...14L ,
Exospheric solar wind charge exchange as seen by XMM-Newton . Carter, J. A., Semba, S., . AN . 333-313 . 2012 . 2012AN....333..313C ,
A report on the X-ray properties of the tau Sco-like stars . Ignace, R., Oskinova, L. M., . MNRAS . 429-516 . 2013 . 2013MNRAS.429..516I ,
B fields in OB stars (BOB): on the detection of weak magnetic fields in the two early B-type stars beta CMa and &epsil CMa. Possible lack of a "magnetic desert" in massive stars . Fossati, L., Castro, N., et all. . A&A . 574-20 . 2015 . 2015A&A...574A..20F ,
On X-ray pulsations in beta Cephei-type variables . Oskinova, L. M., Todt, H., et all. . A&A . 577-32 . 2015 . 2015A&A...577A..32O ,
Sunyaev-Zel.dovich effect or not? Detecting the main foreground effect of most galaxy clusters . Xiao, Weike, Chen, Chen, et all. . MNRAS . 432-41 . 2013 . 2013MNRAS.432L..41X ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
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