CaiiTriplet Spectroscopy of Large Magellanic Cloud Red Giants. I. Abundances and Velocities for a Sample of Populous Clusters | Zendy

A. J. Grocholski | Zendy; Andrew A. Cole | Zendy; Ata Sarajedini | Zendy; D. Geisler | Zendy; Verne V. Smith | Zendy

Open Access

CaiiTriplet Spectroscopy of Large Magellanic Cloud Red Giants. I. Abundances and Velocities for a Sample of Populous Clusters

Author(s) -

A. J. Grocholski,

Andrew A. Cole,

Ata Sarajedini,

D. Geisler,

Verne V. Smith

Publication year - 2006

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 - 10.1086/507303

Subject(s) - physics , astrophysics , metallicity , large magellanic cloud , stars , photometry (optics) , galaxy , spiral galaxy , halo , astronomy , spectroscopy , cluster (spacecraft) , radial velocity , star cluster , computer science , programming language

Abridged Abstract - Utilizing the FORS2 instrument on the VLT, we have obtained near infraredspectra for more than 200 stars in 28 populous LMC clusters. This clustersample spans a large range of ages (~ 1-13 Gyr) and metallicities (-0.3 >[Fe/H] > -2.0) and has good areal coverage of the LMC disk. The strongabsorption lines of the Calcium II triplet are used to derive cluster radialvelocities and abundances. We determine mean cluster velocities to typically1.6 km/s and mean metallicities to 0.04 dex (random error). For eight of theseclusters, we report the first spectroscopically determined metallicities basedon individual cluster stars, and six of these eight have no published radialvelocity measurements. (continued in paper)Comment: 26 pages of text plus 14 figures and 6 tables. Accepted for publication in AJ. Scheduled for Vol. 132, No. 4 (October 2006

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