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J/AJ/142/61         RGB stars in LMC outer disk              (Carrera+, 2011)

Metallicities, age-metallicity relationships, and kinematics of red giant branch stars in the outer disk of the Large Magellanic Cloud. Carrera R., Gallart C., Aparicio A., Hardy E. <Astron. J., 142, 61 (2011)> =2011AJ....142...61C
ADC_Keywords: Magellanic Clouds ; Stars, giant ; Photometry ; Spectroscopy Keywords: galaxies: abundances - galaxies: evolution - galaxies: kinematics and dynamics - galaxies: stellar content - Magellanic Clouds Abstract: The outer disk of the Large Magellanic Cloud (LMC) is studied in order to unveil clues about its formation and evolution. Complementing our previous studies in innermost fields (3kpc≲R≲7kpc), we obtained deep color-magnitude diagrams in six fields with galactocentric distances from 5.2kpc to 9.2kpc and different azimuths. The comparison with isochrones shows that while the oldest population is approximately coeval in all fields, the age of the youngest populations increases with increasing radius. This agrees with the results obtained in the innermost fields. Low-resolution spectroscopy in the infrared CaII triplet region has been obtained for about 150 stars near the tip of the red giant branch in the same fields. Radial velocities and stellar metallicities have been obtained from these spectra. The metallicity distribution of each field has been analyzed together with those previously studied. Description: V- and I-band images for the northern fields, and B- and R-band images for the others, were obtained with the Wide Field Imager (WFI) at the 2.2m telescope at La Silla Observatory, Chile. The spectroscopic observations were carried out in service mode on ESO period 82 with FLAMES mounted at Very Large Telescope (VLT) UT2. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 78 249 LMC RGB stars observed
See also: J/A+A/480/379 : Abundances of 59 red giants in LMC (Pompeia+, 2008) J/AJ/139/878 : RGB stars in 8 LMC clusters (Sharma+, 2010) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Hour of Right Ascension (J2000) 4- 5 I2 min RAm Minute of Right Ascension (J2000) 7- 11 F5.2 s RAs Second of Right Ascension (J2000) 13 A1 --- DE- Sign of the Declination (J2000) 14- 15 I2 deg DEd Degree of Declination (J2000) 17- 18 I2 arcmin DEm Arcminute of Declination (J2000) 20- 23 F4.1 arcsec DEs Arcsecond of Declination (J2000) 25- 30 F6.3 0.1nm W(CaT) The Ca II triplet lines index ΣCa (1) 32- 36 F5.3 0.1nm e_W(CaT) Uncertainty in SigmaCa 38- 44 F7.4 mag BVmag The B or V band magnitude (2) 46- 52 F7.4 mag Imag The I band magnitude 54- 61 F8.4 km/s RV Radial velocity 63- 68 F6.3 km/s e_RV Uncertainty in RV 70- 78 A9 --- Com Comments
Note (1): Defined as the sum of the equivalent widths of the three lines. Note (2): V magnitude for northern field (-61≤DE≤-59), B magnitude for eastern and western fields (-71≤DE≤-70).
History: From electronic version of the journal References: Gallart et al., Paper I 2008ApJ...682L..89G Carrera et al., Paper II 2008AJ....135..836C, Cat. J/AJ/135/836 Carrera et al., Paper III 2007AJ....134.1298C, Cat. J/AJ/134/1298
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 12-Oct-2012
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