The scarce group of Oe stars are usually considered as the hot analogs of theBe-type objects. They should thus feature an equatorial decretion disk, possiblyconfined by a magnetic field. On theoretical grounds, such a magnetic field isexpected to significantly affect the properties of the X-ray spectrum of thestar. However, the existence of a disk has been questioned by recent opticalspectropolarimetric observations and previous X-ray observations of two Oe stars(HD 155806 and HD 119682) revealed two very different behaviours. To help settlethese issues, we propose to obtain XMM-Newton observations of two other Oestars, HD 45314 and HD 60848 for 20 ksec each.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2012-04-02T12:33:47Z/2012-04-14T14:16:12Z
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, Prof Gregor Rauw, 2013, 'Probing the winds of Oe stars: Be disks or not Be disksquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-aa4i4aa
