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An Unexpected Discovery in the Rich Open Cluster NGC 6819 Using XMM-Newton
Natalie M. Gosnell, David Pooley, Aaron M. Geller +4
We present the first study of the X-ray population of the intermediate-age rich open cluster NGC 6819 using the XMM-Newton Observatory. In the past decade, Chandra X-ray observatio…
WIYN Open Cluster Study. XLVIII. The Hard-Binary Population of NGC 188
Aaron M. Geller, Robert D. Mathieu
(abridged) We present an in-depth study of the hard-binary population of the old (7 Gyr) open cluster NGC 188. The main-sequence solar-type hard binaries in NGC 188 are nearly indi…
A mass transfer origin for blue stragglers in NGC 188 as revealed by half-solar-mass companions
Aaron M. Geller, Robert D. Mathieu
In open star clusters, where all members formed at about the same time, blue straggler stars are typically observed to be brighter and bluer than hydrogen-burning main-sequence sta…