J/other/BASI/32.295 CCD UBVRI photometry of 3 open clusters (Sujatha+, 2004)
UBVRI CCD photometric studies of open clusters
Berkeley 15, Czernik 18 and NGC 2401.
Sujatha S., Babu G.S.D., Ananthamurthy S.
<Bull. Astron. Soc. India, 32, 295-309 (2004)>
=2004BASI...32..295S 2004BASI...32..295S
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Keywords: Open clusters - distances - ages
Abstract:
CCD photometric observations of three open clusters Berkeley 15
(= OCl 414), Czernik 18 (= OCl 426) and NGC 2401 (= OCl 588), obtained
for the first time in UBVRI filters down to V=20mag, are presented
here. They are located at distances of 1259, 955 and 3467 parsecs with
their respective ages estimated as ∼5x109years, ∼0.8 to 1x109years
and ∼1x109years. While OCl 414 and OCl 426 are in the direction of
the Auriga - Perseus constellations, OCl 588 is placed in the
direction of Ophiuchus constellation in our Galaxy. The clusters
studied here are of intermediate and old age category.
Description:
The clusters were observed on 13 and 14 December 2001, with the 1.02m
telescope at the Vainu-Bappu Observatory of Indian Institute of
Astrophysics at Kavalur. Standard UBVRI filters along with 1k CCD were
used at the Cassegrain focus of the telescope, the image scale being
0.315arcsec/pixel. The well-known open cluster M67 (NGC 2682) was also
observed on each of the above-mentioned dates for the calibration of
the instrument.
Objects:
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RA (2000) DE Designation(s) (tables)
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05 02 05 +44 30 00 Berkeley 15 = OCl 414 (table3.dat)
04 28 00 +30 56 00 Czernik 18 = OCl 426 (table4.dat)
07 29 24 -13 58 00 NGC 2401 = OCl 588 (table5.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 60 110 Standardised UBVRI photometric data for individual
stars in the open cluster Berkeley 15 (OCl 414)
table4.dat 61 89 Standardised UBVRI photometric data for individual
stars in the open cluster Czernik 18 (OCl 426)
table5.dat 60 146 Standardised UBVRI photometric data for individual
stars in the open cluster NGC 2401 (OCl 588)
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Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- SBA Sequential number (1)
5- 11 F7.3 pix Xpos X position (2)
13- 19 F7.3 pix Ypos Y position (2)
21- 26 F6.3 mag Vmag Johnson V magnitude
28- 33 F6.3 mag U-B ?=- Johnson U-B colour index
35- 40 F6.3 mag B-V Johnson B-V colour index
42- 47 F6.3 mag V-R Johnson V-R colour index
49- 53 F5.3 mag V-I Johnson V-I colour index
55- 60 F6.3 mag B-I Johnson B-I colour index
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Note (1): Simbad designations:
Cl* Berkeley 15 SBA NNN for table 3
Cl* Czernik 18 SBA NN for table 4
Cl* NGC 2401 SBA NNN for table 5
Note (2): North is towards the top and east is towards the left. 1 pix=0.315".
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History:
From electronic version of the journal at ADS
(End) Patricia Vannier [CDS] 24-Oct-2005