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https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

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Using XMM data, we study for the first time the X-ray emission of HM1 andIC2944/2948. Low-mass, pre-main-sequence objects with an age of a few Myr aredetected, as well as a few background or foreground objects. Most massive starsin both clusters display the usual high-energy properties of that type ofobjects, though with log(Lx/Lbol) apparently lower in HM1 than in IC2944/2948.Compared with studies of other clusters, it seems that a low signal-to-noiseratio at soft energies, due to the high extinction, may be the main cause ofthis difference. In HM1, the two Wolf-Rayet stars show contrasting behaviors:WR89 is extremely bright, but much softer than WR87. It remains to be seenwhether wind-wind collisions or magnetically confined winds can explain theseemissions. In IC2944/2948, the X-ray sources concentrate around HD101205; agroup of massive stars to the north of this object is isolated, suggesting thatthere exist two subclusters in the field-of-view.

X-ray properties of the young open clusters HM1 and IC2944/2948