A dataset provided by the European Space Agency

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


DOI https://doi.org/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.
Publication No observations found associated with the current proposal
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