J/other/BASI/29.519 VI CCD photometry in NGC 6631 (Sagar+, 2001)
A deep VI CCD photometric study of the neglected galactic star cluster NGC 6631.
Sagar R., Naidu B.N., Mohan V.
<Bull. Astron. Soc. India, 29, 519 (2001)>
=2001BASI...29..519S 2001BASI...29..519S
ADC_Keywords: Associations, stellar ; Photometry, CCD
Keywords: photometry - cluster: NGC 6631 - colour-magnitude diagram
Abstract:
We present VI CCD photometric observations of about 5500 stars up to a
limiting magnitude of V∼20 in an area of ∼16'x16' around the cluster
NGC 6631. The cluster parameters determined for the first time by
fitting the theoretical isochrones in the V, (V-I) diagram of the
cluster stars are E(V-I)=0.60±0.05mag, distance=2.6±0.5kpc,
age=400±100Myr and metallicity, Z=0.05. The cluster diameter
determined from the radial density profile is 4.8±0.5pc. The mass
function of the cluster has a slope of 2.1±05.
Description:
The VI CCD photometric observations were obtained during May 8 to 10,
2001.
Objects:
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RA (2000) DE Designation(s)
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18 27 12 -12 02.0 NGC 6631
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 40 5533 VI-Cousins CCD observations
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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- 4 I4 --- SNM Sequential number, Cl* NGC 6631 SNM NNNN in Simbad
7- 14 F8.2 pix Xpos X position (1)
17- 24 F8.2 pix Ypos Y position (1)
29- 33 F5.2 mag Vmag Johnson V magnitude
37- 40 F4.2 mag V-Ic Johnson-Cousins V-Ic colour index
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Note (1): North is up and East is left. 1pix =0.48".
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History:
Copied at http://obswww.unige.ch//webda/cgi-bin/frame_type_list.cgi?ngc6631
(End) Patricia Bauer [CDS] 07-Nov-2003