Science, Space and Technology News 2024
Infrared image of the shockwave created by the massive giant star Zeta Ophiuchi in an interstellar dust cloud. The tenuous winds of sun-like main-sequence stars are much more difficult to observe. Credit: NASA/JPL-Caltech; NASA and The Hubble Heritage Team ; C. R.
XMM-Newton X-ray image of the star 70 Ophiuchi and the X-ray emission from the region surrounding the star represented in a spectrum over the energy of the X-ray photons . Most of the emission consists of X-ray photons from the star itself but scattered within the observing telescope and across the camera , but there is a significant contribution around the oxygen K-alpha line at an energy of 0.56 keV that originates from the extended astrosphere rather than from the star .
“We have developed a new algorithm to disentangle the stellar and the astrospheric contributions to the emission and detected charge exchange signals originating from stellar wind oxygen ions and the surrounding neutral interstellar medium of three main-sequence stars. This has been the first time X-ray charge exchange emission from astrospheres of such stars has been detected.
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