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This cluster is fairly compact with a
Trumpler class of I3p,[6] and is still undergoing
star formation.[10][7] It lies at the heart of an
H II region with the identifier S54, and the two are most likely linked.[6] The cluster has an estimated age of 6.5[1] million years and contains several massive stars of the
OB type.[6] One of these is the high mass triple star system HD 167971, which includes the over-contact
eclipsing binary MY Ser. It is one of the most luminous stars in the galaxy.[10] HD 168112 is another colliding-wind binary in the cluster; both systems are over-luminous in their
X-ray emission.[11]
^De Becker, M. (July 2015). "Long-term XMM-Newton investigation of two particle-accelerating colliding-wind binaries in NGC 6604: HD 168112 and HD 167971". Monthly Notices of the Royal Astronomical Society. 451 (1): 1070–1080.
arXiv:1506.01493.
Bibcode:
2015MNRAS.451.1070D.
doi:
10.1093/mnras/stv1034.