Other
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.1786t&link_type=abstract
The Astronomical Journal, vol. 107, no. 5, p. 1786-1792
Other
28
Abundance, Astronomical Photometry, Blue Stars, Color-Magnitude Diagram, Galactic Bulge, Globular Clusters, Horizontal Branch Stars, Metallicity, Spatial Distribution, Calibrating, Charge Coupled Devices, Data Reduction, High Resolution, Optical Filters, Spatial Resolution, Telescopes
Scientific paper
We present color-magnitude diagrams in BVI (Cousins) of the globular cluster NGC 6522 in Baade's Window. Our photometry, which extends to V approximately equals 19, shows that NGC 6522 has an extended blue horizontal branch (BHB), typical of clusters of moderate metallicity close to the galactic center. We derive (Fe/H) = -1.6 +/- 0.2, E(B-V)zero = 0.52 +/- 0.05 for the cluster from comparison to the giant branches of other globulars and from the level of the cluster's horizontal branch. We identify a region in the color-magnitude diagrams which is populated mainly by BHB stars, and show that most of these are spatially concentrated around the cluster and so are not members of the bulge; the spatial density of bulge BHB stars is 0.4 arcmin-2. If the bulge has the same (1750 A--V) color as the bulge of M31, then about 20% the light at 1750 A is from BHB stars.
Terndrup Donald M.
Walker Alistair R.
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