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High resolution infrared spectra of bulge globular clusters: The extreme chemical abundances of Terzan 4 and Terzan 5 | | Livia Origlia
; R. Michael Rich
; | | Date: |
9 Feb 2004 | | Subject: | astro-ph | | Abstract: | Using the NIRSPEC spectrograph at Keck II, we have obtained infrared echelle spectra covering the range $1.5-1.8 mu
m m$ for the highly reddened bulge globular clusters Terzan 4 and Terzan 5. The clusters are of interest because a blue horizontal branch in Terzan 4 is consistent with very low metallicity, while Terzan 5 has been proposed as possibly the most metal rich known Galactic globular cluster. We report the first detailed abundance analysis for stars in these clusters, and we find [Fe/H]=--1.60 and --0.21 dex for Terzan 4 and Terzan 5, respectively, confirming the presence of a large metallicity spread in the bulge as well as in the halo of the Galaxy. We find $
m [alpha/Fe]approx+0.5$ dex in Terzan 4 and $
m [alpha/Fe]approx +0.3$ dex in Terzan 5, consistent with what has been found for field stars in the bulge. The enhanced $alpha-$element abundances are also consistent with rapid chemical enrichment, most likely by type II SNe. Finally, we measure very low $^{12}$C/$^{13}$C$le10$ ratios in all the giant stars, confirming that extra-mixing mechanisms due to {it cool bottom processing} occur during evolution along the RGB. | | Source: | arXiv, astro-ph/0402193 | | Services: | Forum | Review | PDF | Favorites | |
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