Other
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..230a&link_type=abstract
The Astronomical Journal, vol. 107, no. 1, p. 230-239
Other
11
Color-Magnitude Diagram, Galactic Clusters, Metallicity, Stellar Color, Astronomical Photometry, Charge Coupled Devices, Electrophotometry, Red Shift
Scientific paper
We present BVRI photometry of three overlapping fields in the globular cluster NGC 1904 (M79), observed with a charge coupled device (CCD) camera and the 2.2 m Max-Planck-Institute telescope at European Southern Observatory (ESO) La Silla. We critically compare our photometry using the INVENTORY data reduction code with results derived by other investigators using different codes. These comparisons convince us that all modern codes give results reliable to at least +/- 0.03 mag at all levels, as long as the fields are not overly crowded. Specifically, our results for NGC 1904 (M79) are as follows: VTO = 19.60 +/- 0.10 (estimated external error), with turnoff colors at B - V = 0.40, V - R = 0.27, V - I = 0.57, and B - I = 0.97, all with estimated external errors of +/- 0.06. By fitting the four resulting ridge lines to the theoretical isochrones of VandenBerg & Bell (1985) interpolated to (Fe/H) = -1.60, Y = 0.20, and (O/Fe) = 0.00, we derive an average value for the age of 16 Gyr, where we have adopted E(B - V) = 0.01.
Alcaino Gonzalo
Alvarado Franklin
Liller William
Wenderoth Erich
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