A Near-Infrared Photometric Study of the Metal-poor Inner Spheroid Globular Clusters NGC 6139 and NGC 6287

Details A Near-Infrared Photometric Study of the Metal-poor Inner Spheroid Globular Clusters NGC 6139 and NGC 6287 A Near-Infrared Photometric Study of the Metal-poor Inner Spheroid Globular Clusters NGC 6139 and NGC 6287

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.1744d&link_type=abstract

The Astronomical Journal, Volume 116, Issue 4, pp. 1744-1756.

Astronomy and Astrophysics

Astronomy

6

Galaxy: Globular Clusters: Individual: Ngc Number: Ngc 6139, Globular Clusters: Individual (Ngc 6287), Infrared: Stars

Scientific paper

Moderately deep J, H, K, 2.2 μm continuum, and 2.3 μm CO images are used to investigate the photometric properties of stars in the metal-poor inner spheroid globular clusters NGC 6139 and NGC 6287. The data sample stars as faint as the subgiant branch (SGB) in NGC 6139 and the main-sequence turnoff (MSTO) in NGC 6287. The photometric properties of bright giants are used to estimate the distance, metallicity, and reddening of each cluster. The brightness of the red giant branch tip, as calibrated from the Bergbusch & VandenBerg isochrones, suggests that mu_0 = 15.4 +/- 0.1 for NGC 6139 and mu_0 = 14.6 +/- 0.1 for NGC 6287. The steep giant branches and weak 2.3 μm CO indices confirm the extreme metal-poor natures of these clusters and suggest that [Fe/H] = -2 for NGC 6139 and [Fe/H] = -2.2 for NGC 6287. Techniques to correct for reddening variations and foreground star contamination are discussed and applied to the NGC 6287 data to construct a K luminosity function (LF) that is complete almost to the MSTO. Comparisons with LFs derived from the Bergbusch & VandenBerg models suggest that the age of NGC 6287 is 12 Gyr, although the number of SGB stars sampled in the existing study is too small to rule out an age as old as 16 Gyr. It is noted that near-infrared LFs may prove useful for establishing a relative age scale for heavily obscured globular clusters.

Affiliated with

Also associated with

No associations

Rating

A Near-Infrared Photometric Study of the Metal-poor Inner Spheroid Globular Clusters NGC 6139 and NGC 6287 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 A Near-Infrared Photometric Study of the Metal-poor Inner Spheroid Globular Clusters NGC 6139 and NGC 6287, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Near-Infrared Photometric Study of the Metal-poor Inner Spheroid Globular Clusters NGC 6139 and NGC 6287 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1719736