J/AJ/139/878 RGB stars in 8 LMC clusters (Sharma+, 2010)
Toward the general red giant branch slope-metallicity-age calibration. I. Metallicities, ages, and kinematics for eight Large Magellanic Cloud clusters. Sharma S., Borissova J., Kurtev R., Ivanov V.D., Geisler D. <Astron. J., 139, 878-897 (2010)> =2010AJ....139..878S
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Stars, giant Keywords: galaxies: star clusters: general - Magellanic Clouds - stars: abundances Abstract: In this paper, we discuss the properties of color-magnitude diagrams, age, metallicity, and radial velocities of eight massive Large Magellanic Cloud (LMC) clusters using data taken from the FORS2 multiobject spectrograph at the 8.2m Very Large Telescope/Unit Telescope 1. The strong near-infrared CaII triplet lines of red giant branch stars obtained from the high signal-to-noise ratio spectra are used to determine the metallicity and radial velocity of cluster members. Description: Short exposure images of eight LMC clusters were observed with FORS2 VLT through the filters V and R under excellent atmospheric conditions (seeing<0.7") on 2006 October 5 and 2006 November 17. The spectroscopic observations were carried out with FORS2 in visitor mode at the Antu (VLT-UT1) 8.2m telescope at ESO's Paranal Observatory during the night of 2006 November 16-17. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 35 8 Log of the imaging observations table2.dat 83 198 Position and measured values for all RGB stars (coordinates corrected by the author)
See also: J/A+A/480/379 : Abundances of 59 red giants in LMC (Pompeia+, 2008) J/MNRAS/383/183 : CaII triplet of RGB from VLT/FLAMES obs. (Battaglia+, 2008) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 -- Cluster Cluster name 9- 10 I2 h RAh Right ascension (J2000) 12- 13 I2 min RAm Right ascension (J2000) 15- 16 I2 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign (J2000) 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 26 I2 arcsec DEs Declination (J2000) 28- 29 I2 s ExpV Exposure time in V band 31- 32 I2 s ExpR Exposure time in R band 34- 35 I2 --- Nstar Number of stars in table2
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Star Star designation, Cluster-NN 12- 13 I2 h RAh Right ascension (J2000) (1) 15- 16 I2 min RAm Right ascension (J2000) 18- 22 F5.2 s RAs Right ascension (J2000) 24 A1 --- DE- Declination sign (J2000) (1) 25- 26 I2 deg DEd Declination (J2000) (1) 28- 29 I2 arcmin DEm Declination (J2000) 31- 34 F4.1 arcsec DEs Declination (J2000) 36- 40 F5.1 km/s RV Radial velocity 42- 45 F4.1 km/s e_RV rms uncertainty on RV 47- 51 F5.2 mag V-VHB Brightness difference between star (V) and cluster's horizontal branch (VHB) 53- 55 I3 --- S/N Signal-to-noise ratio 57- 60 F4.2 0.1nm SW Sum of the EWs of three Ca triplet lines (2) 62- 65 F4.2 --- W' Reduced equivalent width, W'=SW+β(V-VHB) 67- 70 F4.2 --- e_W' rms uncertainty on W' 72- 76 F5.2 [Sun] [Fe/H] Metallicity 78- 81 F4.2 [Sun] e_[Fe/H] rms uncertainty on [Fe/H] 83 A1 --- Mmb [mn] Membership (m, member; n, non-member)
Note (1): Positions corrected by the author (in the original publication, they are shifted towards SE from 1" to more). Note (2): Where SW = EW(8498) + EW(8542) + EW(8662).
History: * 16-May-2012: from electronic version of the journal * 23-Oct-2012: Table 2, coordinates corrected by the author.
(End) Patricia Vannier [CDS] 16-May-2012
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