The table below gives standard magnitudes measured through B, V, and I filters for the standard stars used to calibrate our images of M13. Each star is indicated by both a letter which corresponds to the markers in the above picture and its Stetson identification number.

ID Stetson ID B Magnitude V Magnitude I Magnitude
A 566 14.021 12.899 11.68
B 572 14.497 13.514 12.410
C 518 14.427 13.433 12.324
D 1407 13.781 12.484 11.140
E 1465 15.187 14.356 13.357
F 1232 14.257 13.197 12.039

There are three Cepheid IIs in M13; V1, V6, and V2. Watch this space for color-magnitude diagrams and light curves!

SEDS Info On M13.

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