Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743448s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #434.48; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Detailed chemical abundances for twenty one elements are presented for four red giants in the anomalous globular cluster Palomar 1 using high-resolution (R=36000) spectra from the High Dispersion Spectrograph (HDS) on the Subaru telescope. Pal 1 has long been considered unusual because of its low surface brightness, sparse red giant branch, young age, and its possible association with an extragalactic stream of stars. The mean metallicity of the four stars is in agreement with the Ca II triplet metallicity, [Fe/H] = -0.6 +/- 0.2, and does not show significant scatter from star to star. Furthermore, the [alpha/Fe] ratios are similar to those of Galactic stars at this metallicity; therefore the chemistry of these 4 stars suggests that Pal 1 does not have an (obvious) extra galactic origin. However, some variations in the heavy element abundances do indicate an interesting formation/evolutionary history for this cluster.
Aoki Wako
Arimoto Nobou
Irwin Mike
Sakari Charli
Venn Kim
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