, Volume 62, Issue 3, pp 209-216

A globular cluster in the dwarf galaxy Sextans B

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Abstract

We present spectroscopic observations of a massive globular cluster in the dwarf irregular galaxy Sextans B, discovered by us on the Hubble Space Telescope Wide Field and Planetary Camera 2 (HST WFPC2) images. Long-slit spectra were obtained with the SCORPIO spectrograph on the 6-m telescope at the Special Astrophysical Observatory of the Russian Academy of Sciences. We determine the age, metallicity and alpha-element abundance ratio for the globular cluster to be 2 ± 1 Gyr, −1.35 ±0.25 dex, and 0.1 ± 0.1 dex, respectively. Main photometric and structural parameters of it were determined using our surface photometry on the HST images. The mass (∼105 M⊙), luminosity and structural parameters appear to be typical of the globular clusters in our own Galaxy. Our findings shed new light on the evolutionary history of Sextans B.

Original Russian Text © M.E. Sharina, T.H. Puzia, A.S. Krylatyh, 2007, published in Astrofozicheskij Byulleten, 2007, Vol. 62, No. 3, pp. 225–232.