Infrared Echelle Spectroscopy of Palomar6 and M71
arXiv:astro-ph/0408269 · doi:10.1086/425047
Abstract
We present high-resolution infrared echelle spectroscopy for the globular clusters Palomar 6 and M71. Our mean heliocentric radial velocity of Palomar 6 is +180.6 +/- 3.2 km sec/s and is 20 km/s lower than that found by Minniti in 1995. Contrary to the previous metallicity estimates using low-resolution spectroscopy, our results show that Palomar~6 has an intermediate metallicity with [Fe/H] = -1.0 +/- 0.1 and is slightly more metal-poor than M71. Reasonable changes in the surface temperature or the microturbulent velocity of the model atmospheres do not affect [Fe/H] at more than +/- 0.2 dex. In spite of its high metallicity, based on the spectrum of a single cluster member the [Si/Fe] and [Ti/Fe] ratios of Palomar~6 appear to be enhanced by 0.4 dex and 0.5 dex, respectively, suggesting that the Galactic inner halo may have experienced a very rapid chemical enrichment history.
arXiv commentAccepted for publication in AJ (Nov. 2004)
References in corpus (14)
- The YY Isochrones for alpha-element Enhanced Mixtures
- Star-to-Star Abundance Variations among Bright Giants in the Mildly Metal-Poor Globular Cluster M4
- New Analyses of Star-to-Star Abundance Variations Among Bright Giants in the Mildly Metal-Poor Globular Cluster M5
- The Chemical Composition Contrast between M3 and M13 Revisited: New Abundances for 28 Giant Stars in M3
- The First Stellar Abundance Measurements in the Galactic Center: the M Supergiant IRS 7
- Stellar Iron Abundances at the Galactic Center
- An abundance analysis for four Red Horizontal Branch Stars in the extremely metal rich globular cluster NGC 6528
- An Abundance Analysis for Five Red Horizontal Branch Stars in the Extremely Metal Rich Globular Cluster NGC 6553
- High resolution infrared spectra of bulge globular clusters: Liller~1 and NGC 6553
- On the UV Bright Phase of Metal-Rich Horizontal-Branch Stars
- Space Velocities of Southern Globular Clusters. IV. First Results for Inner-Galaxy Clusters
- Chemical Abundances Of Three Metal-Poor Globular Clusters (NGC 6287, NGC 6293, And NGC 6541) In The Inner Halo
- Infrared Spectroscopic Study of 8 Galactic Globular Clusters
- Infrared Photometry of the Globular Cluster Palomar 6
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- A Deep View of a Fossil Relic in the Galactic Bulge: The Globular Cluster HP1
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- On the metallicity distribution of the peculiar globular cluster M22
- Deep Hubble Space Telescope Imaging of Globular Clusters Towards the Galactic Bulge: Observations, Data Reduction and Color-Magnitude Diagrams
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- Dynamical evolution of Milky Way globular clusters on the cosmological timescale I. Mass loss and interaction with the nuclear star cluster
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- Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6