Chemical Composition of Globulars of the Sagittarius System

Astronomy and Astrophysics – Astronomy

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Scientific paper

We will present results about the abundances of iron, alpha-elements, and the r-process element Eu of six red giant stars belonging to Sagittarius globular clusters Terzan 8 and Arp 2. The Sagittarius dwarf galaxy (Sgr) offers an opportunity to study the chemical evolution of a galaxy very different from the Milky Way. Detailed chemical composition measurements of the Sgr globular clusters (GCs) will permit us to define the differences between this dwarf galaxy and the Milky Way, that would provide a check on current ideas in the chemical evolution, place constraints on the star formation rate and IMF in the Sgr, and set limits on the accretion of objects similar to Sgr in the construction of the Galactic halo. Thus, it is particularly important to have a complete census of the handful of GCs (M54, Terzan 7, Pal 12, Terzan 8, and Arp 2) associated with the Sgr galaxy. Well determined chemical composition for the most metal-poor Sgr GCs would be very useful, as currently there is data only for M54. Photometric estimates suggest that Ter 8 and Arp 2 have metallicities near -1.6 and -2.0 dex respectively. Thus, these two GCs are vital to our knowledge of the metal-poor Sgr GC population and they are also thought to be among the oldest GCs in the Sgr system, so their measured abundances would significantly clarify the age-composition relation of the Sgr dwarf galaxy. With the scenario described above in mind, we have collected high-resolution spectra of six red giant stars to undertake the first detailed chemical abundance analysis of globular clusters Terzan 8 and Arp 2. Spectra with resolving power of 40,000 and spectral range between 3400 and 9400 A were obtained with the echelle spectrograph MIKE mounted on the 6.5m telescope at Las Campanas Observatory.

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