A dataset provided by the European Space Agency

Name 040105
Title The B Supergiant Bistability-Jump in X-ray Emission
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0401050201

DOI 10.5270/esa-mtc1xf8
Author Dr Wayne Waldron
Description The stellar winds of B supergiants (BSgs) go through a discontinuous jump in their terminal velocities, mass loss rates, and X-ray emission at spectral type B1 which is referred to as the bistability of BSg winds. Since wind shocks produce the X-ray emission and are highly dependent on the stellar wind parameters, BSgs provide a natural laboratory to study the relationship between the radiative force, stellar wind, and X-ray emission. Although the drop in X-ray flux appears consistent with theoretical predictions, our AO-3 XMM observations of 2 BSgs at the jump indicate severe problems with current theory. We are requesting one additional EPIC observation of J Pup (B0.5 Ib), a BSg located near the bistability jump, to determine the extent of these problems.
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The XMM Cluster Su...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2007-03-16T22:12:46Z/2007-03-17T19:27:14Z
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 2008-09-27T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2008-09-27T00:00:00Z, 040105, 17.56_20190403_1200. https://doi.org/10.5270/esa-mtc1xf8