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Multiple Stellar Populations of Globular Clusters from Homogeneous Ca-CN-CH-NH Photometry. VI. M3 (NGC 5272) is not a Prototypical Normal Globular Cluster
Jae-Woo Lee, Christopher Sneden
We present Ca-CN-CH-NH photometry for the well-known globular cluster (GC) M3 (NGC 5272). We show new evidence for two M3 populations with distinctly different carbon and nitrogen…
The Distances to Open Clusters from Main-Sequence Fitting. V. Extension of Color Calibration and Test using Cool and Metal-Rich Stars in NGC 6791
Deokkeun An, Donald M. Terndrup, Marc H. Pinsonneault +1
We extend our effort to calibrate stellar isochrones in the Johnson-Cousins () and the 2MASS () filter systems based on observations of well-studied open clusters. Us…
The RR Lyrae variables and Horizontal Branch of NGC6656 (M22)
Andrea Kunder, Peter B. Stetson, Santi Cassisi +10
The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC6656 (M22), with observations spanning a range of twenty-two years. We…