Spectral energy distribution and abundances of NGC 288 stars

NGC 288, an intermediate Population II globular cluster located near the south Galactic pole, has a dominant blue horizontal branch, intermediate metallicity, and age about 15 Gyr. It has been investigated in a number of studies using spectrophotometric techniques. We present here new spectral energy distributions (SEDs) of bright stars in NGC 288 constructed using 12 of the BATC (Beijing Arizona Taipei Connecticut) 15 intermediate-band filter systems. Using Kurucz models, we have estimated reliable effective temperatures for stars and [Fe/H] = - 1.24 + 0.04. Using theoretical isochrones that Worthey has calculated for our filter set, we obtain a distance modulus of m - M = 14.57 ± 0.07 for this cluster. The purpose of this study is to establish a stellar SED data bank by using cluster stars of different age, temperature, abundance and surface gravity. The SEDs for the stars in NGC 288 form part of this data bank, which will be used for future studies of objects in Selected Area fields.