Deep near-IR photometry of eight metal-poor globular clusters in the Galactic bulge and halo

Details Deep near-IR photometry of eight metal-poor globular clusters in the Galactic bulge and halo Deep near-IR photometry of eight metal-poor globular clusters in the Galactic bulge and halo

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...459..499k&link_type=abstract

Astronomy and Astrophysics, Volume 459, Issue 2, November IV 2006, pp.499-509

Astronomy and Astrophysics

Astrophysics

4

Galaxy: Structure, Galaxy: Globular Clusters: General, Stars: Evolution, Infrared: Stars, Techniques: Photometric

Scientific paper

High quality J, H and K' images are used to investigate the morphological properties of the near-infrared color-magnitude diagrams for five metal-poor bulge globular clusters and three halo clusters. Photometric parameters to describe the RGB shape, i.e., the colors at fixed magnitudes of M_K=M_H=(-5.5, -5, -4 and -3), the magnitudes at fixed colors of (J-K)o = (J-H)o = 0.70, and the RGB slope, have been measured from the fiducial normal points of the CMDs. We also measured the near-infrared magnitudes of the RGB bump and tip on the luminosity function of the RGB stars for each cluster. The RGB parameters of the observed metal-poor bulge and halo clusters are consistent with the previous empirical relationships between the RGB parameters and the cluster metallicity for metal-rich bulge clusters and halo clusters. The near-infrared magnitudes of the RGB bump and tip are in good agreement with the theoretical prediction of the Yonsei-Yale isochrone.

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