Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-03-25
Astronomy and Astrophysics
Astrophysics
6 pages, 2 included figures, aas2pp4,sty Latex style. To be published in Astrophysical Journal Letters
Scientific paper
10.1086/310670
The recent detection of a double Red Giant Branch in the optical color-magnitude diagram (CMD) of the bulge globular cluster HP1 (Ortolani et al. 1997), a more populated metal-poor steep one corresponding to the cluster itself, and another metal-rich curved, led us to explore in the present Letter the possibility of capture of field stars by a globular cluster orbiting in dense bulge regions over several gigayears. Analytical arguments, as well as N-body calculations for a cluster model of 10^5 solar masses in a bulge-like environment, suggest that a significant fraction of cluster stars may consist of captures. Metal-poor globular clusters in the inner bulge, like HP1, contrasting at least in Delta [Fe/H] = 1.0 dex with respect to the surrounding metal-rich stars, are ideal probes to further test the capture scenario. In turn, if this scenario is confirmed, the double RGB of HP1 could provide direct estimates of blanketing amounts, which is fundamental for the photometric calibration of metal-rich stellar populations.
Barbuy Beatriz
Bica Eduardo
Dottori Horacio
Oliveira Irapuan Rodrigues de F.
Ortolan Sergio
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