The persistent Be accreting pulsars are a sub-class of the BeXRBs characterizedby persistently low luminosity (Lx = 10^(34-35) erg/s) and long pulse period (P> 100 s). Since in these binaries the matter is accreted from the low-densitywind of the companion star, these systems are a particularly interestinglaboratory to study the emission processes occuring at low accretion rates.Therefore, it is very important to identify and investigate new sources of thistype. To this aim, we propose to observe the Galactic Be pulsar 4U 0728-25,which is a poorly studied candidate member of this class of sources. Our aim isto examine, at an unprecedented sensitivity level, its spectral and timingproperties, and to test if the description of the other persistent pulsars is applicable also in this case.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2023-04-10T20:55:36Z/2023-04-11T09:48:56Z
Version
20.10_20230417_1156
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, Mr Nicola La Palombara, 2024, 'Observation of the candidate persistent Be X-ray binary pulsar 4U 0728-25', 20.10_20230417_1156, European Space Agency, https://doi.org/10.57780/esa-[xxxxxxx]
