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 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:
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FileName Lrecl Records Explanations
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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)
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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)
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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).
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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