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An X-Ray Survey of the Open Cluster NGC 6475 (M7) With ROSAT
1995
Astronomical Journal
A ROSAT x-ray survey, with complimentary optical photometry, of the open cluster NGC 6475 has enabled the detection of -50 late-F to K0 and -70 K/M dwarf new candidate members, providing the first reliable detection of low-mass stars in this low galactic latitude, 220 Myr old cluster. The x-ray observations reported here have a typical limiting sensitivity of Lx=1029 erg/s. The detection frequency of early type cluster members is consistent with the hypothesis that the x-ray emitting early type
doi:10.1086/117599
fatcat:bgmlmsxksnc2hmuwecbffurscy