Near-Infrared Imaging of the Central Regions of Metal-Poor Inner Spheroid Globular Clusters

Details Near-Infrared Imaging of the Central Regions of Metal-Poor Inner Spheroid Globular Clusters Near-Infrared Imaging of the Central Regions of Metal-Poor Inner Spheroid Globular Clusters

2001-04-26

arxiv.org/abs/astro-ph/0104434v1

Astronomy and Astrophysics

Astrophysics

26 pages of text and 13 postscript figures. To appear in the Astronomical Journal

Scientific paper

10.1086/321078

JHK images obtained with the Canada-France-Hawaii Telescope (CFHT) Adaptive Optics Bonnette (AOB) are used to investigate the near-infrared photometric properties of red giant branch (RGB) and horizontal branch (HB) stars in eight metal-poor globular clusters with R_GC < 2 kpc. The slope of the RGB on the (K, J-K) CMDs confirms the metal-poor nature of these clusters, four of which appear to have metallicities comparable to M92. The luminosity functions of RGB stars in inner spheroid and outer halo clusters have similar slopes, although there is a tendency for core-collapsed clusters to have slightly flatter luminosity functions than non-collapsed clusters. The distribution of red HB stars on the (K, J-K) CMDs of inner spheroid clusters with [Fe/H] ~ -1.5 is very different from that of clusters with [Fe/H] ~ -2.2, suggesting that metallicity is the main parameter defining HB content among these objects. The RGB-bump is detected in four of the inner spheroid clusters, and this feature is used to compute distances to these objects. Finally, the specific frequency of globular clusters in the inner Galaxy is discussed in the context of the early evolution of the bulge. If the globular cluster formation efficiency for the inner Galaxy is similar to that measured in other spheroidal systems, then the main body of the bulge could have formed from gas that was chemically enriched in situ.

Affiliated with

Also associated with

No associations

Rating

Near-Infrared Imaging of the Central Regions of Metal-Poor Inner Spheroid Globular Clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Near-Infrared Imaging of the Central Regions of Metal-Poor Inner Spheroid Globular Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-Infrared Imaging of the Central Regions of Metal-Poor Inner Spheroid Globular Clusters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-654553