Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..999w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 3, p. 999-1004.
Other
17
Color-Magnitude Diagram, Magellanic Clouds, Star Clusters, Variable Stars, Metallicity, Star Distribution, Stellar Spectrophotometry
Scientific paper
A search for RR Lyrae variables in the vicinity of the old Large Magellanic Cloud (LMC) cluster Hodge 11 has resulted in the discovery of only one variable, which is probably a field star. A color-magnitude diagram (CMD) confirms that the cluster is very metal poor, Fe/H = -2.04 +/- 0.2, with E(V-I) = 0.10 +/- 0.02. The distribution of stars on the horizontal branch (HB) is skewed to the extent that only blue HB stars appear to be present - these have a bifurcated grouping, as in M15. There are a few extremely blue stars that appear to be on a hotter extension of the HB - as they have no field counterparts these stars are likely cluster members. If the LMC distance modulus is assumed to be 18.5 mag, and a geometric correction corresponding to the position of Hodge 11 of -0.09 mag is applied, then Mv(HB) = 0.44 +/- 0.12, in excellent agreement with that found for other old LMC clusters. The surrounding field population mostly has age 2-3 Gyr and Fe/H is about - 0.5; there is a significant break in the luminosity function at about 2 Gyr in that there are only a few younger stars. A small cluster near Hodge 11 has an age of 1.5 Gyr.
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