J/AJ/141/115 BV(RI)c photometry on NGC 3532 (Clem+, 2011)
Deep, wide-field CCD photometry for the open cluster NGC 3532.
Clem J.L., Landolt A.U., Hoard D.W., Wachter S.
<Astron. J., 141, 115 (2011)>
=2011AJ....141..115C 2011AJ....141..115C
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD
Keywords: open clusters and associations: individual (NGC 3532) -
techniques: photometric
Abstract:
We present the results of a deep, wide-field CCD survey for the open
cluster NGC 3532. Our new BV(RI)c photometry effectively covers a one
square degree area and reaches an unprecedented depth of V∼21 to
reveal that NGC 3532 is a rich open cluster that harbors a large
number of faint, low-mass stars. We employ a number of methods to
reduce the impact of field star contamination in the cluster
color-magnitude diagrams (CMDs), including supplementing our
photometry with JHKs data from the 2MASS catalog. These efforts allow
us to define a robust sample of candidate main-sequence stars suitable
for a purely empirical determination of the cluster's parameters by
comparing them to the well-established Hyades main sequence.
Description:
The current observations of NGC 3532 were collected at the Cerro
Tololo Inter-American Observatory (CTIO) 0.9m telescope over a number
of nights scheduled during the 2000 A observing semester. The images
were obtained using a 2048x2048 Tektronix CCD equipped with a set
of broadband Johnson-Kron-Cousins BV(RI)c filters.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 130 316367 BV(RI)c CCD photometry and equatorial
coordinates for stars in NGC 3532
table3.dat 115 230 New photometry for previously studied stars
table4.dat 87 230 Previous broadband photometry for stars in
NGC 3532
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- Seq [1/316367] Sequential identification number
8- 14 F7.1 pix Xpix X-coordinate in finding chart (1)
16- 22 F7.1 pix Ypix Y-coordinate in finding chart (1)
24- 29 F6.3 mag Bmag ?=99.999 Photometric Johnson B band magnitude
31- 36 F6.4 mag e_Bmag ?=9.9999 Standard error in Bmag
38- 39 I2 --- o_Bmag ?=0 Number of measurements in Bmag
41- 46 F6.3 mag Vmag ?=99.999 Photometric Johnson V band magnitude
48- 53 F6.4 mag e_Vmag ?=9.9999 Standard error in Vmag
55- 56 I2 --- o_Vmag ?=0 Number of measurements in Vmag
58- 63 F6.3 mag Rmag ?=99.999 Photometric Cousins R band magnitude
65- 70 F6.4 mag e_Rmag ?=9.9999 Standard error in Rmag
72- 73 I2 --- o_Rmag ?=0 Number of measurements in Rmag
75- 80 F6.3 mag Imag ?=99.999 Photometric Cousins I band magnitude
82- 87 F6.4 mag e_Imag ?=9.9999 Standard error in Imag
89- 90 I2 --- o_Imag ?=0 Number of measurements in Imag
92- 97 F6.3 --- chi Mean value of χ
99-106 F8.3 --- sharp Mean value of sharpness parameter
(0 for stellar fit)
108-109 I2 h RAh Hour of Right Ascension (J2000)
111-112 I2 min RAm Minute of Right Ascension (J2000)
114-118 F5.2 s RAs Second of Right Ascension (J2000)
120 A1 --- DE- Sign of the Declination (J2000)
121-122 I2 deg DEd Degree of Declination (J2000)
124-125 I2 arcmin DEm Arcminute of Declination (J2000)
127-130 F4.1 arcsec DEs Arcsecond of Declination (J2000)
--------------------------------------------------------------------------------
Note (1): increases west from RA=11:05:33 at 0.25"/pixel and
increases north from Dec=-58:43:48 at 0.25"/pixel.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- WEBDA WEBDA catalog number
5- 10 I6 --- Seq Sequential identification number,
as in table2
12- 13 I2 h RAh Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- Sign of the Declination (J2000)
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 41 F6.3 mag Bmag Photometric Johnson B band magnitude
43- 48 F6.4 mag e_Bmag Standard error in Bmag
50- 51 I2 --- o_Bmag Number of measurements in Bmag
53- 58 F6.3 mag Vmag Photometric Johnson V band magnitude
60- 65 F6.4 mag e_Vmag Standard error in Vmag
67- 68 I2 --- o_Vmag Number of measurements in Vmag
70- 75 F6.3 mag Rmag Photometric Cousins R band magnitude
77- 82 F6.4 mag e_Rmag Standard error in Rmag
84- 85 I2 --- o_Rmag Number of measurements in Rmag
87- 92 F6.3 mag Imag Photometric Cousins I band magnitude
94- 99 F6.4 mag e_Imag Standard error in Imag
101-102 I2 --- o_Imag Number of measurements in Imag
104-108 F5.3 --- chi Mean value of χ
110-115 F6.3 --- sharp Mean value of sharp
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- WEBDA WEBDA catalog number
5- 9 F5.2 mag Vmag1 ?=99.99 Koelbloed (1959BAN....14..265K 1959BAN....14..265K)
V band magnitude
11- 15 F5.2 mag (B-V)1 ?=99.99 Koelbloed (1959BAN....14..265K 1959BAN....14..265K)
(B-V) color index
17- 21 F5.2 mag Vmag2 ?=99.99 Butler 1977 V band magnitude
23- 27 F5.2 mag (B-V)2 ?=99.99 Butler 1977 (B-V) color index
29- 33 F5.2 mag Vmag3 ?=99.99 Fernandez & Salgado
(1980A&AS...39...11F 1980A&AS...39...11F) V band magnitude
35- 39 F5.2 mag (B-V)3 ?=99.99 Fernandez & Salgado
(1980A&AS...39...11F 1980A&AS...39...11F) (B-V) color index
41- 45 F5.2 mag Vmag4 ?=99.99 Johansson (1981A&AS...43..421J 1981A&AS...43..421J)
V band magnitude
47- 51 F5.2 mag (B-V)4 ?=99.99 Johansson (1981A&AS...43..421J 1981A&AS...43..421J)
(B-V) color index
53- 57 F5.2 mag Vmag5 ?=99.99 Wizinowich & Garrison
(1982AJ.....87.1390W 1982AJ.....87.1390W) V band magnitude
59- 63 F5.2 mag (B-V)5 ?=99.99 Wizinowich & Garrison
(1982AJ.....87.1390W 1982AJ.....87.1390W) (B-V) color index
65- 69 F5.2 mag (V-Rc)5 ?=99.99 Wizinowich & Garrison
(1982AJ.....87.1390W 1982AJ.....87.1390W) (V-Rc) color index
71- 75 F5.2 mag (V-Ic)5 ?=99.99 Wizinowich & Garrison
(1982AJ.....87.1390W 1982AJ.....87.1390W) (V-Ic) color index
77- 81 F5.2 mag Vmag6 ?=99.99 Claria & Lapasset
(1988MNRAS.235.1129C 1988MNRAS.235.1129C) V band magnitude
83- 87 F5.2 mag (B-V)6 ?=99.99 Claria & Lapasset
(1988MNRAS.235.1129C 1988MNRAS.235.1129C) (B-V) color index
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Aug-2012