J/ApJ/562/303 Old Stellar Populations of the SMC (Dolphin+ 2001)
Old Stellar Populations of the Small Magellanic Cloud
Dolphin A.E., Walker A.R., Hodge P.W., Mateo M., Olszewski E.W.,
Schommer R.A., Suntzeff N.B.
<Astrophys. J. 562, 303 (2001)>
=2001ApJ...562..303D 2001ApJ...562..303D
ADC_Keywords: Magellanic Clouds ; Populations, stellar
Mission_Name: HST
Description:
Photometry is given for six data sets of SMC photometry, all in the V
and I bands. Field names in the file summary below are the names used
in the STScI archive for the WFPC2 observations. WFPC2 observations of
NGC 121 and the SMC fields reach limiting magnitudes of V=26 and
I=25.5; ground-based observations cover a square region of 14.5 arcmin
on a side and reach V=25.5 and I=24.5.
Objects:
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RA (2000) DE Designation(s)
-----------------------------------------
00 26 42 -71 31 00 NGC 121 field
00 46 00 -70 35 00 SMC Field 1
00 49 00 -70 48 00 SMC Field 2
00 46 12 -70 47 00 SMC Field 3
00 49 00 -70 33 00 SMC Field 4
-----------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
field1.dat 41 952 SMC-004600-703500 photometry
field2.dat 41 1180 SMC-004900-704800 photometry
field3.dat 41 1039 SMC-004612-704700 photometry
field4.dat 41 970 SMC-004900-703300 photometry
ground.dat 41 16110 Ground-based photometry
ngc121.dat 41 16710 NGC121 photometry
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Byte-by-byte Description of file: field1.dat field2.dat field3.dat field4.dat
Byte-by-byte Description of file: ngc121.dat
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Bytes Format Units Label Explanations
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1 A1 --- Chip WFPC2 chip number; 1=PC1, 2=WFC2, etc.
3- 8 F6.2 pix X *X position
10- 15 F6.2 pix Y *Y position
17- 22 F6.3 mag Vmag V magnitude in HST F555W filter
24- 28 F5.3 mag e_Vmag V uncertainty
30- 35 F6.3 mag Imag I magnitude in HST F814W filter
37- 41 F5.3 mag e_Imag I uncertainty
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Note on X and Y: Positions are given in the HSTphot system; (0.5,0.5) refers
to the center of the lower-left pixel.
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Byte-by-byte Description of file: ground.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 pix X *X position
9- 15 F7.2 pix Y *Y position
17- 22 F6.3 mag Vmag V magnitude
24- 29 F6.3 mag V-I V-I color
31- 35 F5.3 mag e_Vmag V uncertainty
37- 41 F5.3 mag e_V-I V-I uncertainty
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Note on X and Y: Positions are given in the DAOPHOT system; (1.0,1.0) refers
to the center of the lower-left pixel.
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(End) Andrew Dolphin [NOAO] 10-Dec-2001