X-ray properties of the young open clusters HM1 and IC2944/2948
Abstract
Using XMM data, we study for the first time the X-ray emission of HM1 and IC2944/2948. Low-mass, pre-main-sequence objects with an age of a few Myr are detected, as well as a few background or foreground objects. Most massive stars in both clusters display the usual high-energy properties of that type of objects, 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-noise ratio at soft energies, due to the high extinction, may be the main cause of this difference. In HM1, the two Wolf-Rayet stars show contrasting behaviors: WR89 is extremely bright, but much softer than WR87. It remains to be seen whether wind-wind collisions or magnetically confined winds can explain these emissions. In IC2944/2948, the X-ray sources concentrate around HD101205; a group of massive stars to the north of this object is isolated, suggesting that there exist two subclusters in the field-of-view.
Keywords
Cite
@article{arxiv.1305.5105,
title = {X-ray properties of the young open clusters HM1 and IC2944/2948},
author = {Yael Naze and Gregor Rauw and Hugues Sana and Michael F. Corcoran},
journal= {arXiv preprint arXiv:1305.5105},
year = {2015}
}
Comments
29 pages in total with 10 figures (12 pages paper + supplementary material), accepted by A&A