J/MNRAS/397/1073 UBVI photometry in NGC 2587 (Piatti+, 2009)
NGC 2587: a sparse open cluster projected on to a populous star field.
Piatti A.E., Claria J.J., Ahumada A.V.
<Mon. Not. R. Astron. Soc., 397, 1073-1083 (2009)>
=2009MNRAS.397.1073P 2009MNRAS.397.1073P
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Keywords: techniques: photometric -
galaxy: open clusters and associations: general -
Galaxy: open clusters and associations: individual: NGC 2587
Abstract:
We present CCD photometry in the Johnson U, B and V and Kron-Cousins
I passbands for the open cluster NGC 2587. The sample consists of 4406
stars reaching down to V∼21.0. We developed a new method to clean
statistically the colour-magnitude diagrams. NGC 2587 appears to be
a sparse, relatively bright open cluster, with a few tens of members
projected on to a populous star field.
Description:
We obtained CCD images of the cluster field with the UBVIKC filters
and the 0.9-m telescope at Cerro Tololo Inter-American Observatory
(CTIO, Chile) during the night of 2000 December 28-29.
Objects:
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RA (2000) DE Designation(s)
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08 23.5 -29 30 NGC 2587 = Cl Collinder 184
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 92 33 Calibrated UBVI data of standard stars
table3.dat 82 4406 CCD UBVI data of stars in the field of NGC 2587
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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- 12 A12 --- Name Star name
14- 19 F6.3 mag Vmag V magnitude
21- 25 F5.3 mag e_Vmag rms uncertainty on Vmag
27- 32 F6.3 mag r(V) Residual (calibrated standard value) in Vmag
34- 39 F6.3 mag U-B U-B colour index
41- 45 F5.3 mag e_U-B rms uncertainty on U-B
47- 52 F6.3 mag r(U-B) Residual (calibrated standard value) in U-B
54- 59 F6.3 mag B-V B-V colour index
61- 65 F5.3 mag e_B-V rms uncertainty on B-V
67- 72 F6.3 mag r(B-V) Residual (calibrated standard value) in B-V
74- 79 F6.3 mag V-I V-I colour index
81- 85 F5.3 mag e_V-I rms uncertainty on V-I
87- 92 F6.3 mag r(V-I) Residual (calibrated standard value) in V-I
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/4406] Sequential number
6- 13 F8.3 pix Xpos X position (1)
15- 22 F8.3 pix Ypos Y position (1)
24- 29 F6.3 mag Vmag V magnitude
31- 35 F5.3 mag e_Vmag rms uncertainty on Vmag
37 I1 --- o_Vmag Number of measurements in V band
39- 44 F6.3 mag U-B ?=99.999 U-B colour index
46- 50 F5.3 mag e_U-B ?=9.999 rms uncertainty on U-B
52 I1 --- o_U-B Number of measurements in U-B
54- 59 F6.3 mag B-V ?=99.999 B-V colour index
61- 65 F5.3 mag e_B-V ?=9.999 rms uncertainty on B-V
67 I1 --- o_B-V Number of measurements in B-V
69- 74 F6.3 mag V-I ?=99.999 V-I colour index
76- 80 F5.3 mag e_V-I ?=9.999 rms uncertainty on V-I
82 I1 --- o_V-I Number of measurements in V-I
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Note (1): North is up and east is to the left. 1pix=0.4arcsec.
The bright star close to the cluster centre is HD 70927
(No. 2096, x=896.643, y=1113.205, RA=08:23:37.7730, DE=-29:30:04.447, Eq=J2000)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Jun-2011