The 2MASS Color-Magnitude Diagram of the Globular Cluster Lyngå 7

Details The 2MASS Color-Magnitude Diagram of the Globular Cluster Lyngå 7 The 2MASS Color-Magnitude Diagram of the Globular Cluster Lyngå 7

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....128.1228s&link_type=abstract

The Astronomical Journal, Volume 128, Issue 3, pp. 1228-1232.

Astronomy and Astrophysics

Astronomy

6

Globular Clusters: Individual (Lyngå 7)

Scientific paper

We have extracted JHKS photometry from the All-Sky Point Source Catalog of the Two Micron All Sky Survey (2MASS) in the vicinity of the globular cluster Lyngå 7. The cluster color-magnitude diagram (CMD) extends from the tip of the red giant branch to approximately 1 mag below the core helium burning red clump stars. The reddening-independent red giant branch slope in the 2MASS photometric system is measured to be Δ(J-KS)/ΔKS=-0.104+/-0.004, which implies a metal abundance of [Fe/H]=-0.76+/-0.06 on the Carretta & Gratton scale. Adopting a reddening of E(B-V)=0.73+/-0.12 as the average of previously published values, we use the inferred absolute K-band magnitude of the red clump [MK(RC)=-1.28+/-0.07] to calculate a distance of (m-M)0=14.33+/-0.10 (7.3+/-0.3 kpc). Finally, we have reanalyzed the previously published optical CMD of Lyngå 7 from Ortolani and coworkers along with the 2MASS near-IR photometry and conclude that Lyngå 7 is close in age to 47 Tucanae, if not slightly (~2 Gyr) younger.
This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.

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