Consequences of the Pegasus AG outbreak

Consequences of the Pegasus AG outbreak

Using the ESA XMM-Newton Space Telescope, researchers were able to observe the symbiotic star AG Pegasus after the end of its flash in 2015. Pegasus AG (HD 207757) is a dual system represented by a red giant and a white dwarf. It is classified as a symbiotic new due to a slow new-like outbreak. The first outbreak was recorded in the mid-19th century, and the last in 2015.

AG Pegasus was repeatedly observed in x-rays. But the discrepancy in the results of research on the properties of X-rays showed that further reviews are needed to determine more accurate characteristics. Therefore, in November 2017, scientists used the XMM-Newton telescope to study the new one after its last flash.

Consequences of the Pegasus AG outbreak

The original image of AG Pegasus from EPIC-MOS1 (0.2-10 keV) in the energy band with spectral extraction regions. The original spectrum was extracted from the central circle, and the background spectrum was extracted from the adjacent annular space. The circled plus sign gives the Pegasus AG optical location (SIMBAD) Astronomers report that XMM-Newton observations have provided better-quality information than previous X-ray surveys from the Swift and ROSAT space telescopes. The new information allowed better limit the characteristics of the X-rays of Pegasus AG. It turns out that these rays are endowed with thermal origin and almost all source calculations are located at energies above 2.0 keV. This means that the star is in a state after the explosion and belongs to the class of beta X-ray sources of symbiotic stars.

Also, the reviews did not reveal short-term variability of X-rays. This suggests that X-rays and UV rays in Pegasus AG are from different areas of the binary system and are subject to different formation mechanisms. There is an assumption that X-rays are caused by opposing stellar winds in a binary system. But it is necessary to conduct additional observations in other spectral regions to confirm this theory.

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