J/MNRAS/417/1559 CT1T2 photometry in 14 SMC star clusters (Piatti+, 2011)
Washington photometry of 14 intermediate-age to old star clusters in the
Small Magellanic Cloud.
Piatti A.E., Claria J.J., Bica E., Geisler D., Ahumada A.V., Girardi L.
<Mon. Not. R. Astron. Soc., 417, 1559-1575 (2011)>
=2011MNRAS.417.1559P 2011MNRAS.417.1559P
ADC_Keywords: Magellanic Clouds ; Associations, stellar ; Photometry, CMT1T2V
Keywords: techniques: photometric - galaxies: individual: SMC -
Magellanic Clouds - galaxies: star clusters: general
Abstract:
We present CCD photometry in the Washington system C, T1 and T2
passbands down to T1∼23 in the fields of L3, L28, HW 66, L100, HW 79,
IC 1708, L106, L108, L109, NGC 643, L112, HW 84, HW 85 and HW 86, 14
Small Magellanic Cloud (SMC) clusters, most of them poorly studied
objects. We measured T1 magnitudes and C-T1 and T1-T2 colours for
a total of 213 516 stars spread throughout cluster areas of
14.7x14.7arcmin2 each. We carried out an in-depth analysis of the
field star contamination of the colour-magnitude diagrams (CMDs) and
statistically cleaned the cluster CMDs.
Description:
We obtained images for the cluster sample on the nights of 2000
October 29-31, with a 2048x2048 pixel Tektronix CCD attached to
the 1.5-m telescope (scale 0.432arcsec/pixel) 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 168 14 Observation log of selected clusters
table18.dat 92 14 Fundamental properties of the SMC clusters
phot/* . 12 CCD CT1T2 data of stars in the field of the
selected clusters
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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- 7 A7 --- Cluster Cluster name (1)
9- 25 A17 --- OName Other name(s)
27 I1 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 33 I2 s RAs Right ascension (J2000)
35 A1 --- DE- Declination sign (J2000)
36- 37 I2 deg DEd Declination (J2000)
39- 40 I2 arcmin DEm Declination (J2000)
42- 43 I2 arcsec DEs Declination (J2000)
45- 50 F6.2 deg GLON Galactic longitude
52- 57 F6.2 deg GLAT Galactic latitude
59- 69 A11 --- FileName Name of the table with photometry
in subdirectory phot
71- 80 A10 "YYYY/MM/DD" Date1 First date of observation
82- 85 I4 s expC1 Exposure time in C band for Date1
87- 90 F4.2 --- airC1 Airmass in C band for Date1
92- 94 F3.1 arcsec seeC1 Seeing in C band for Date1
96- 98 I3 s expR1 Exposure time in R band for Date1
100-103 F4.2 --- airR1 Airmass in R band for Date1
105-107 F3.1 arcsec seeR1 Seeing in R band for Date1
109-111 I3 s expI1 Exposure time in I band for Date1
113-116 F4.2 --- airI1 Airmass in I band for Date1
118-120 F3.1 arcsec seeI1 Seeing in I band for Date1
122-131 A10 "YYYY/MM/DD" Date2 Second date of observation
133-135 I3 s expC2 ? Exposure time in C band for Date2
137-140 F4.2 --- airC2 ? Airmass in C band for Date2
142-144 F3.1 arcsec seeC2 ? Seeing in C band for Date2
146-147 I2 s expR2 ? Exposure time in R band for Date2
149-152 F4.2 --- airR2 ? Airmass in R band for Date2
154-156 F3.1 arcsec seeR2 ? Seeing in R band for Date2
158-159 I2 s expI2 ? Exposure time in I band for Date2
161-164 F4.2 --- airI2 ? Airmass in I band for Date2
166-168 F3.1 arcsec seeI2 ? Seeing in I band for Date2
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Note (1): Cluster identifications are from Lindsay (1958MNRAS.118..172L 1958MNRAS.118..172L,
LNNN, <Cl Lindsay NNN>), Hodge & Wright (1974AJ.....79..858H 1974AJ.....79..858H, HW NN) and
Lauberts (1982, Cat. VII/34, ESO).
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Byte-by-byte Description of file: table18.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Cluster Cluster name
10- 13 F4.2 mag E(BH) Colour excess E(B-V) from Burstein & Heiles
(1982AJ.....87.1165B 1982AJ.....87.1165B)
18- 21 F4.2 mag SFD.m Colour excess E(B-V) from Schlegel et al. maps
(1998ApJ...500..525S 1998ApJ...500..525S), lower limit
26- 29 F4.2 mag SFD.M Colour excess E(B-V) from SFD, upper limit
34- 37 F4.2 mag E(B-V) Adopted colour excess
42- 45 F4.2 Gyr Age Age of cluster
47- 49 A3 --- --- [±]
51- 54 F4.2 Gyr e_Age Mean error on Age
57 A1 --- l_dT1 Limit on dT1
58- 61 F4.2 mag dT1 ? δT1 from cluster sequence
63- 65 A3 --- --- [±]
67- 70 F4.2 mag e_dT1 ? Mean error on dT1
74- 77 F4.1 [Sun] [Fe/H] Metallicity from isochrone analysis
80- 84 F5.2 [Sun] FeSGB ? Metallicity from Standard Giant Branch
86- 88 A3 --- --- [±]
90- 92 F3.1 [Sun] e_FeSGB ? Mean erro ron SGB
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Byte-by-byte Description of file: phot/*
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Sequential number
7- 14 F8.3 pix Xpos X position
16- 23 F8.3 pix Ypos Y position
25- 30 F6.3 mag T1mag Washington T1 (red) magnitude
32- 36 F5.3 mag e_T1mag rms uncertainty on T1mag
38 I1 --- o_T1mag Number of observation for T1
40- 45 F6.3 mag C-T1 ?=99.999 Washington C-T1 colour index
47- 51 F5.3 mag e_C-T1 ?=9.999 rms uncertainty on C-T1
53 I1 --- o_C-T1 Number of observations for C-T1
55- 60 F6.3 mag T1-T2 ?=99.999 Washington T1-T2 colour index
62- 66 F5.3 mag e_T1-T2 ?=9.999 rms uncertainty on T1-T2
68 I1 --- o_T1-T2 Number of observations for T1-T2
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 07-May-2012