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J/AJ/129/1465      Spectroscopy of red giants in the LMC bar       (Cole+, 2005)

Spectroscopy of red giants in the Large Magellanic Cloud bar: abundances, kinematics, and the age-metallicity relation. Cole A.A., Tolstoy E., Gallagher J.S.III, Smecker-Hane T.A. <Astron. J., 129, 1465-1482 (2005)> =2005AJ....129.1465C
ADC_Keywords: Magellanic Clouds ; Stars, giant ; Radial velocities ; Abundances Keywords: galaxies: evolution - galaxies: stellar content - Magellanic Clouds Abstract: We report metallicities and radial velocities derived from spectra at the near-infrared calcium triplet for 373 red giants in a 200arcmin2 area at the optical center of the LMC bar. These are the first spectroscopic abundance measurements of intermediate-age and old field stars in the high surface brightness heart of the LMC. The metallicity distribution is sharply peaked at the median value [Fe/H]=-0.40, with a small tail of stars extending down to [Fe/H]≤-2.1; 10% of the red giants are observed to have [Fe/H]≤-0.7. Description: The spectroscopic observations were made in Visitor Mode at the Yepun (VLT-UT4) 8.2m telescope at ESO's Paranal Observatory, on the nights of 2002 December 24-26. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 100 373 Data for red giants in the bar field table3.dat 45 373 Derived quantities for red giants in the bar field
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AJ/120/1808 : Stroemgren photometry in LMC disk (Cole+, 2000) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASS The 2MASS identification (G1) 18- 21 A4 --- Field Field identification 23- 28 F6.3 mag Vmag The V band magnitude 30- 34 F5.3 mag e_Vmag The 1σ error in Vmag 36- 41 F6.3 mag Imag The I band magnitude 43- 47 F5.3 mag e_Imag The 1σ error in Imag 49- 53 F5.1 km/s RV Heliocentric velocity 55- 57 F3.1 km/s e_RV The 1σ error in RV 59- 62 F4.2 0.1nm EW Summed 3 Ca II triplet equivalent width in units of Angstroms (1) 64- 67 F4.2 0.1nm e_EW The 1σ error in EW 68-100 A33 --- Note Additional note
Note (1): Of the three lines ranged from 3.5Å≤EW≤10Å, with typical errors of ∼2%.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 16 A16 --- 2MASS The 2MASS Identification (G1) 18- 22 F5.2 [Sun] [Fe/H] Log of Fe/H number abundance 24- 27 F4.2 [Sun] e_[Fe/H] The 1σ error in [Fe/H] 29- 33 F5.2 [Sun] [a/Fe] Log of (α-process elements)/Fe number abundance 35- 39 F5.2 [yr] log(Age) Log of the age 41- 44 F4.2 [yr] e_log(Age) The 1σ error in log(Age)
Global Notes: Note (G1): Except where an unambiguous identification was not possible; in these cases the number from the OGLE-II catalog.
History: From electronic version of the journal References: Cole et al., 2000AJ....120.1808C, Cat. J/AJ/120/1808 Cole et al., 2004MNRAS.347..367C Smecker-Hane et al., 2004, ApJ, submitted
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 22-Aug-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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