|Title||AN XMM STUDY OF THE BISTABILITY JUMP IN THE STELLAR WINDS OF B ERGIANTS|
|Author||Dr WAYNE WALDRON|
|Description||The stellar winds of B supergiants (SGs) go through a discontinuous jump in their terminal velocities and mass loss rates at spectral type B1 which is referred to as the bistability of B SGs. Since wind shocks produce the X-ray emission and are highly dependent on the stellar wind parameters, B SGs provide a natural laboratory to study the relationship between the radiative force, stellar wind, and X-ray emission. We are requesting EPIC-pn observations of 4 known B SG X-ray sources located at or near the bistability jump. The X-ray fluxes show a decrease, but the cause is not known. Spectral analyses of these EPIC observations will allow us to test the predictions of the stellar wind shock model.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2006-06-15T00:00:00Z, 020155, 17.56_20190403_1200. https://doi.org/10.5270/esa-gdvcuk8|