Infrared Echelle Spectroscopy of Palomar 6 and M71 | Zendy

Jae-Woo Lee | Zendy; Bruce W. Carney | Zendy; S. Balachandran | Zendy

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Infrared Echelle Spectroscopy of Palomar 6 and M71

Author(s) -

Jae-Woo Lee,

Bruce W. Carney,

S. Balachandran

Publication year - 2004

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/425047

Subject(s) - metallicity , globular cluster , astrophysics , spectroscopy , halo , galactic halo , infrared spectroscopy , physics , high resolution , infrared , astronomy , stars , materials science , galaxy , geology , quantum mechanics , remote sensing

We present high-resolution infrared echelle spectroscopy for the globularclusters Palomar 6 and M71. Our mean heliocentric radial velocity of Palomar 6is +180.6 +/- 3.2 km sec/s and is 20 km/s lower than that found by Minniti in1995. Contrary to the previous metallicity estimates using low-resolutionspectroscopy, our results show that Palomar~6 has an intermediate metallicitywith [Fe/H] = -1.0 +/- 0.1 and is slightly more metal-poor than M71. Reasonablechanges in the surface temperature or the microturbulent velocity of the modelatmospheres do not affect [Fe/H] at more than +/- 0.2 dex. In spite of its highmetallicity, 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 avery rapid chemical enrichment history.Comment: Accepted for publication in AJ (Nov. 2004

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