A New Color-Magnitude Diagram for 47 Tucanae: A Statistical Analysis

Details A New Color-Magnitude Diagram for 47 Tucanae: A Statistical Analysis A New Color-Magnitude Diagram for 47 Tucanae: A Statistical Analysis

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aj....138.1455b&link_type=abstract

The Astronomical Journal, Volume 138, Issue 5, pp. 1455-1464 (2009).

Astronomy and Astrophysics

Astronomy

11

Globular Clusters: General, Globular Clusters: Individual: 47 Tuc

Scientific paper

We present a statistical analysis of color-magnitude diagrams of 47 Tuc derived from original and archival BVI photometry that produces the most probable locus for single stars. After adopting E(B-V) = 0.04, we derive an apparent distance modulus (m - M) V = 13.375 and achieve good matches to the most probable locus in the [B - V, V], [V - I, I], and [B - I, I] planes with 12 Gyr, [α/Fe] = +0.3, [Fe/H] = -0.83 isochrones from the Victoria-Regina models. This metallicity is generally lower than recent spectroscopically derived estimates for the cluster, but it is reinforced by the main-sequence match with a sample of subdwarfs.
Based in part on observations made with the European Southern Observatory (ESO) telescopes and obtained from the ESO/ST-ECF Science Archive facility.

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