Based on observations collected with the Danish
1.54-m telescope at the European Southern Observatory, La Silla (Chile); at
Complejo Astronómico El Leoncito, which is operated under agreement between the
Consejo Nacional de Investigaciones Científicas y Técnicas de la
República Argentina and the National Universities of La Plata, Córdoba,
and San Juan, Argentina, and at Cerro Tololo Inter-American Observatory,
National Optical Astronomy Observatories, operated by the Association of
Universities for Research in Astronomy, Inc., under contract with the National
Science Foundation.
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