|Title||The stellar wind of hot subdwarf stars|
|Author||Dr Nicola La Palombara|
|Description||All we know about hot subdwarf (sd) stars is based on studies in the optical and UV domain, while none of them has been detected at X-rays. The only exception is the sdO binary HD49798, in which the WD companion shows a significant X-ray emission, due to the matter accreted from the sd primary. A recent XMM observation of this source has revealed a significant X-ray emission also during the eclipse phase, when the WD is obscured by the primary subdwarf, thus suggesting that the observed X-ray flux is due to the subdwarf itself. In order to investigate if also other sdO stars are characterized by an intrinsic X-ray emission, we propose to observe BD+37 442: it is a nearby and bright sdO star with a strong stellar wind, therefore it is the best candidate to perform this type of search.|
|Publication||Discovery of a Compact Companion to the Hot Subdwarf Star BD +37 442 . La Palombara, Nicola, Mereghetti, Sandro, et all. . ApJ . 750-34 . 2012 . 2012ApJ...750L..34L ,
Observations of the Unique X--ray Emitting Subdwarf Stars HD 49798 and BD +37 442 . La Palombara, N., Mereghetti, S., et all. . CEAB . 37-267 . 2013 . 2013CEAB...37..267L ,
Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift . Yershov, V. N., . Ap&SS . 354-97 . 2014 . 2014Ap&SS.354...97Y ,
The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
News on the X-ray emission from hot subdwarf stars . Palombara, Nicola La, Mereghetti, Sandro, . OAst . 26-187 . 2017 . 2017OAst...26..187P ,
|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, 2012-09-13T00:00:00Z, 067139, 17.56_20190403_1200. https://doi.org/10.5270/esa-vv7pyiu|