Appendix A

Photometric calibration fields. All coordinates are epoch 2000. Finding charts can be found at: http://cadcwww.hia.nrc.ca/standards and continue with the stetson link in the upper left corner.

Field	RA(2000)	Dec(2000)	Mag.	Comment
NGC 6397	17 40 41.30	-53 40 25	$V\sim12.5$	Main field
NGC 6752	19 12 44.70	-59 59 14	$V\sim15$
L106-550	14 40 55.40	-00 28 57	$V\sim15$
PG1525	15 28 13.50	-07 15 42	$V\sim15$
L107	15 39 18.90	-00 22 48	$V\sim15$
PG1323	13 25 50.60	-08 50 23	$V\sim15$
PG1633	16 35 32.70	+09 47 07	$V\sim15$
L110-232	18 40 50.40	+00 01 47	$V\sim16$
L110-441	18 43 22.90	+00 27 47	$V\sim16$
Mark A	20 44 02.00	-10 47 09	$V\sim15$

Figure: Palomar Sky Survey image of NGC 6397

Figure: Image of NGC$\,$6397 obtained with DFOSC and a Loral CCD. The field for this project should be centered on the cluster. Stars that we are primarily interested in are marked with circles, such that they can be checked for saturation. They have $V\,\sim\,12.5$.

Figure: Color-magnitude diagram of the field shown in Fig. 2. The circled stars in Fig. 2 are marked with large $+$ signs.