A Method for Simultaneous Determination of Metallicity and Reddening of a Globular Cluster based on the $V vs. (B-R)$ Color-Magnitude Diagram

Details A Method for Simultaneous Determination of Metallicity and Reddening of a Globular Cluster based on the $V vs. (B-R)$ Color-Magnitude Diagram A Method for Simultaneous Determination of Metallicity and Reddening of a Globular Cluster based on the $V vs. (B-R)$ Color-Magnitude Diagram

2009-03-13

arxiv.org/abs/0903.2351v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

10 pages, 4 figures, accepted by Astronomy Letters

Scientific paper

We describe a method by which the abundance of metals and the reddening of globular clusters are simultaneously derived. The method is based on the analysis of the shape of the red giant branch and V magnitude of the horizontal branch on the V vs. (B-R) color-magnitude diagram for a cluster. The application of our technique to the photometry of the globular cluster NGC7006 yields the metallicity $[Fe/H] = - 1.78 \pm0.11$ and the reddening $E_{B-R} = 0.^{m}25 \pm0.^{m}02$.

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