Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-14
Astronomy and Astrophysics
Astrophysics
Now with correct Figure 6; no other changes; 22 pages, 8 figures, accepted for publication in the AJ
Scientific paper
10.1088/0004-6256/135/4/1551
We present chemical abundances for O, Na, Mg, Al, Si, Ca, Ti and Fe in eight red giants and one turnoff star in the metal rich globular cluster 47 Tuc, based on spectroscopy with the MIKE high resolution spectrograph on the Magellan 6.5-m Clay telescope. A robust line by line differential abundance analysis technique, relative to the K-giant Arcturus, was used to reduce systematic errors from atmospheric and atomic parameters. Our derived mean LTE [Fe/H] of -0.76 +- 0.01 +- 0.04 dex (random and systematic error, respectively) is more metal poor by about 0.1 dex than recent literature results. The chemical element ratios in this nearby globular cluster most closely resemble those of the Galactic bulge, although there is a non-negligible overlap with the composition of thick-disk stars. We find that the [Al/Fe] and [Na/Fe] ratios coincide with the upper boundary of the trends seen in the bulge and thick disk. There is only a small intrinsic scatter in the majority of the abundance ratios, indicating that 47 Tuc is mostly a rather chemically homogeneous system.
Koch Andreas
McWilliam Andrew
No associations
LandOfFree
A new abundance scale for the globular cluster 47 Tuc does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A new abundance scale for the globular cluster 47 Tuc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A new abundance scale for the globular cluster 47 Tuc will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-37390