tokens: We thank the McDonald Observatory staff in West Texas for their hospitality during the observing runs for this research. P. W. C. especially thanks David Doss for his help, without which the collection of some of this data would not have been possible. P. W. C. would also like to acknowledge Pat Hartigan for his comments and discussion throughout this project. We thank the referee for their helpful comments which improved the quality of this manuscript. This research has made use of the SIMBAD database and the NASA Astrophysics Data System. We acknowledge partial support for this research from the NSF through grant 1212122, from NASA Astrophysics Data Analysis Program through grant NNX13AF09G, and from Space Telescope Science Institute through grant HST-60-12996.001, all made to Rice University.
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