An XMM-Newton observation of the multiple system HD 167971 (O5-8V + O5-8V + (O8I)) and the young open cluster NGC 6604

@article{Becker2005AnXO,
  title={An XMM-Newton observation of the multiple system HD 167971 (O5-8V + O5-8V + (O8I)) and the young open cluster NGC 6604},
  author={M. D. Becker and G. Rauw and R. Blomme and J. Pittard and I. Stevens and M. Runacres},
  journal={Astronomy and Astrophysics},
  year={2005},
  volume={437},
  pages={1029-1046}
}
We discuss the results of two XMM-Newton observations of the open cluster NGC 6604 obtained in April and September 2002. We concentrate mainly on the multiple system HD 167971 (O5-8V + O5-8V + (O8I)). The soft part of the EPIC spectrum of this system is thermal with typical temperatures of about 2 × 10 6 to 9 × 10 6 K. The nature (thermal vs. non-thermal) of the hard part of the spectrum is not unambiguously revealed by our data. If the emission is thermal, the high temperature of the plasma… Expand
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