We propose XMM-Newton observations of two extreme magnetic Ap/Bp stars, HD 75049and HD 137509, that exhibit surface field strengths of about 30 kG. HD 75049 isan Ap star and its extraordinary large magnetic field is dominated by a strongdipole component. The B9p star HD 137509 exhibits a similar surface fieldstrength, but the underlying magnetic structure has a far more complex fieldgeometry. Our targets have magnetic fields that rival famous Babcock.s star thatwas recently established as a bright X-ray source. X-ray emission fromintermediate mass stars is thought to originate from magnetically confinedwind-shocks and the aim of this proposal is to test, whether HD 75049 and HD137509 emit X-rays and if so, to determine their basic X-ray properties.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2010-10-04T22:17:26Z/2010-11-28T01:53:42Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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.
European Space Agency, Dr Jan Robrade, 2011, 'The buddies of Babcock.s star - X-ray emission from extreme magnetic ApBp starsquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-i3il18l
