J/PASP/123/519 C,T1 photometry of 6 LMC clusters (Piatti+, 2011)
First estimates of the fundamental parameters of three Large Magellanic Cloud
clusters.
Piatti A.E., Claria J.J., Parisi M.C., Ahumada A.V.
<Publ. Astron. Soc. Pac., 123, 519-530 (2011)>
=2011PASP..123..519P 2011PASP..123..519P
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Photometry, CMT1T2V
Keywords: star clusters and associations - astronomical techniques - galaxies
Abstract:
As part of an ongoing project to investigate the cluster formation and
chemical evolution history in the Large Magellanic Cloud (LMC), we
have used the CTIO 0.9m telescope to obtain CCD imaging in the
Washington system of NGC 2161, SL 874, and KMHK 1719 - three unstudied
star clusters located in the outer region of the LMC. We measured T1
magnitudes and C-T1 colors for a total of 9611 stars distributed
throughout cluster areas of 13.6x13.6arcmin2. Cluster radii were
estimated from star counts distributed throughout the entire observed
fields. Careful attention was paid to setting apart the cluster and
field star distributions so that statistically cleaned color-magnitude
diagrams (CMDs) were obtained. Based on the best fits of isochrones
computed by the Padova group to the (T1, C-T1) CMDs, the δT1
index, and the standard giant branch procedure, ages and metallicities
were derived for the three clusters.
Description:
We obtained images for the three selected clusters on the nights of
2004 December 17 and 18 with a 2048x2048-pixel Tektronix CCD attached
to the 0.9m telescope (scale 0.396"/pix) at Cerro Tololo
Inter-American Observatory (CTIO), Chile.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 126 5 Observation Log of selected clusters
table2.dat 50 1689 CCD CT1 data of stars in the field of L 110
table3.dat 50 881 CCD CT1 data of stars in the field of L 112
table4.dat 50 3478 CCD CT1 data of stars in the field of NGC 2161
table5.dat 50 6139 CCD CT1 data of stars in field of SL 874
table6.dat 50 6139 CCD CT1 data of stars in field of KMHK 1719
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Cluster Star cluster name (1)
11 I1 h RAh Cluster right ascension (J2000)
13- 14 I2 min RAm Cluster right ascension (J2000)
16- 17 I2 s RAs Cluster right ascension (J2000)
19 A1 --- DE- Cluster declination sign (J2000)
20- 21 I2 deg DEd Cluster declination (J2000)
23- 24 I2 arcmin DEm Cluster declination (J2000)
26- 27 I2 arcsec DEs Cluster declination (J2000)
29- 34 F6.2 deg GLON Galactic longitude
36- 41 F6.2 deg GLAT Galactic latitude
43- 53 A11 "Y/M/D" ObsDate Observation date (2004 year)
55- 58 I4 s ExpC Exposture time for C filter
60- 63 F4.2 arcsec AirM.C Air mass for C filter
65- 67 F3.1 --- See.C ? Seeing for C filter
69- 71 I3 s ExpR Exposture time for R filter
73- 76 F4.2 arcsec AirM.R Air mass for R filter
78- 80 F3.1 --- See.R ? Seeing for R filter
82- 87 A6 --- File Name of the table with photometry
89-126 A38 --- OName Other star name(s) (1)
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Note (1): Cluster identifications from:
L = Lindsay 1958MNRAS.118..172L 1958MNRAS.118..172L, <Cl Lindsay NNN>
ESO = Lauberts 1982, Cat. VII/34,
SL = Shapley & Lindsay 1963IrAJ....6...74S 1963IrAJ....6...74S, <[SL63] NNN>
LW = Lynga & Westerlund 1963MNRAS.127...31L 1963MNRAS.127...31L,
KMHK = Kontizas et al. 1990, Cat. VII/183,
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Byte-by-byte Description of file: table[2-6].dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequential number within the field
6- 13 F8.3 pix Xpos X position (1)
15- 22 F8.3 pix Ypos Y position (1)
24- 29 F6.3 mag T1mag T1 magnitude
32- 36 F5.3 mag e_T1mag rms uncertainty on T1mag
38- 43 F6.3 mag C-T1 C-T1 colour index
46- 50 F5.3 mag e_C-T1 rms uncertainty on C-T1
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Note (1): The dimensions of each selected field region were 600x600 pixels
and acted as reference to statistically filter an equal area centered
on the clusters. 1 pix = 0.396arcsec.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Mar-2013