Abstract
view Abstract Citations (15) References (47) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS BVRI CCD Photometry of the Globular Cluster NGC 1904 (M79) Alcaino, Gonzalo ; Liller, William ; Alvarado, Franklin ; Wenderoth, Erich Abstract 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. Publication: The Astronomical Journal Pub Date: January 1994 DOI: 10.1086/116846 Bibcode: 1994AJ....107..230A Keywords: Color-Magnitude Diagram; Galactic Clusters; Metallicity; Stellar Color; Astronomical Photometry; Charge Coupled Devices; Electrophotometry; Red Shift; Astronomy; GLOBULAR CLUSTERS: INDIVIDUAL: NGC 1904 (M79) full text sources ADS | data products SIMBAD (7) CDS (1)
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