Abstract
view Abstract Citations (28) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Blue Horizontal Branch Stars in NGC 6522 And Baade's Window Terndrup, Donald M. ; Walker, Alistair R. Abstract 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. Publication: The Astronomical Journal Pub Date: May 1994 DOI: 10.1086/116986 Bibcode: 1994AJ....107.1786T Keywords: 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; Astronomy; GLOBULAR CLUSTERS: INDIVIDUAL: NGC 6522; STARS: HORIZONTAL-BRANCH full text sources ADS | data products SIMBAD (6)
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