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J/MNRAS/306/361 UBVI CCD photometry of M35 (NGC 2168) (Sung+ 1999)
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UBVI CCD photometry of M 35 (NGC 2168).
Sung H., Bessell M.S.
<Mon. Not. R. Astron. Soc. 306, 361 (1999)>
=1999MNRAS.306..361S
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ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Abstract:
UBVI CCD photometry has been obtained for the intermediate-age open
cluster M35 (NGC 2168). From this new photometry we derived the
cluster parameters (Vo-MV= 9.60+/-0.10 mag, E(B-V) = 0.255+/-0.024
mag), age (logAge=8.3+/-0.3) and a photometric abundance (Z~0.008,
i.e. [Fe/H]~-0.3) from comparison with theoretical isochrones of the
Padova group. A minimum binary frequency (35+/-5%) was estimated from
the distribution of distance moduli of unevolved proper motion
members. Faint photometric members were selected by using differences
in the reddening effect on colour indices.
Description:
BVI CCD photometry was performed for the central region of M35 on 1997
November 23 at Siding Spring Observatory with the 40-inch telescope
(f/8) and a thinned SITe 2048×2048 CCD (24-mm pixels). The scale was
0.602 arcsec/pixel, giving 20.5arcmin on a side. Two sets of exposure
times were used in the observations: long exposures 60s in I, 150s in
V, 300s in B, 600s in U; short exposures: 5s in I and V, 7s in B and
15s in U. The seeing was between 1.4 and 2.1arcsec.
Objects:
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RA (2000) DE Designation(s)
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06 08 56 +24 21.6 M35 = NGC 2168 = C 0605+243
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 102 1150 CCD photometry in M35
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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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3- 6 I4 --- Seq [1,1150]+ Running number
(Cl* NGC 2168 SB Seq in Simbad)
8- 14 F7.3 arcmin oRA RA Distance to HD 41940
16- 22 F7.3 arcmin oDE DE Distance to HD 41940
24- 29 F6.3 mag Vmag V magnitude (Johnson)
31- 36 F6.3 mag V-I V-I Cousins color index
38- 43 F6.3 mag B-V B-V Johnson color index
45- 50 F6.3 mag U-B U-B Johnson color index
53- 57 F5.3 mag e_Vmag Photometric standard error on Vmag
59- 63 F5.3 mag e_V-I V-I Photometric standard error on V-I
65- 69 F5.3 mag e_B-V B-V Photometric standard error on B-V
71- 75 F5.3 mag e_U-B U-B Photometric standard error on U-B
78 I1 --- o_Vmag Number of independent detections
80 I1 --- o_V-I Number of independent detections
82 I1 --- o_B-V Number of independent detections
84 I1 --- o_U-B Number of independent detections
87- 89 I3 --- M+S ? ID number used by McNamara & Sekiguchi
(1986AJ.....91..557M)
90 A1 --- m_M+S Multiplicity index on M&S
91- 94 F4.2 --- PrPM [0,1]? proper motion membership probability
96- 98 F3.1 --- TClass ? Temperature class (0=O, 1=B, 2=A, etc)
100-102 F3.1 --- LClass ? Luminosity class (V=5.0, III=3.0)
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Acknowledgements:
sungh@astro.snu.ac.kr
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(End) Hwankyung Sung [Seoul Univ.] Francois Ochsenbein [CDS] 20-May-2001