Abstract
view Abstract Citations (43) References (50) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Young Globular Clusters in the Milky Way: ARP 2 Buonanno, R. ; Corsi, C. E. ; Pecci, F. Fusi ; Richer, H. B. ; Fahlman, G. G. Abstract We have obtained the first B,V CCD color-magnitude diagram (CMD) of the galactic globular cluster Arp 2. About 1600 stars have been measured between the tip of the red giant branch at V approximately 15.5 and V approximately 23.5, about two magnitudes below the main sequence turnoff. A centrally concentrated population of blue stragglers has been detected. The slope of the red giant branch and the overall CMD morphology are consistent with that of a metal-poor cluster, with (Fe/H) = -1.84 +/- 0.25. A preliminary spectroscopic measurement based on the Ca II triplet yields (Fe/H) = -1.73 +/- 0.05. The comparison of the CMD of Arp 2 with that of other clusters favors a value more metal-poor than that indicated by the Ca II triplet. In this respect, Arp 2 is similar to Ruprecht 106. Differential ages between Arp 2 and a number of reference clusters are obtained from the vertical age parameter, deltaHBTO and the horizontal age parameter, delta(B-V)RGBTO By requiring both age estimators to give consistent results, we find that Arp 2 is approximately 3 Gyr younger than the group of the metal-poor clusters and slightly older than Ruprecht 106. The detection of young metal-poor clusters (Fe/H) less than or = -1.8) implies a complex scenario for the origin of the galactic halo, possibly involving interactions with satellite galaxies and their cluster systems. Publication: The Astronomical Journal Pub Date: February 1995 DOI: 10.1086/117308 Bibcode: 1995AJ....109..650B Keywords: Chronology; Color-Magnitude Diagram; Globular Clusters; Milky Way Galaxy; Astronomical Spectroscopy; Blue Stars; Charge Coupled Devices; Galactic Clusters; Galactic Halos; Interacting Galaxies; Metallicity; Morphology; Red Giant Stars; Astronomy; GLOBULAR CLUSTERS: INDIVIDUAL: ARP 2 full text sources ADS | data products SIMBAD (19) CDS (1)
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