J/A+A/428/67 UBVRI mag of 3 Open Cluster Remnants candidates (Villanova+, 2004)
NGC 5385, NGC 2664 and Collinder 21: three candidate Open Cluster Remnants.
Villanova S., Carraro G., de la Fuente Marcos R., Stagni R.
<Astron. Astrophys. 428, 67 (2004)>
=2004A&A...428...67V 2004A&A...428...67V
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD
Keywords: open clusters and associations: individual: NGC 5385, NGC 2664,
Collinder 21 - open clusters and associations: general -
stars: binaries: close
Abstract:
We present CCD UBVI photometric and medium/high resolution
spectroscopic observations obtained in the field of the previously
unstudied dissolving open cluster candidates NGC 5385, NGC 2664 and
Collinder 21. Our analysis is based on the discussion of star counts,
photometry, radial velocity distribution, and proper motions available
from the Tycho 2 catalogue (I/259). All three aggregates clearly
emerge from the mean Galactic field, but, regrettably, the close
scrutiny of proper motions and radial velocities reveals that we are
not facing any physical group. Instead, what we are looking at are
just chance alignments of a few bright unrelated stars. Our analysis
casts some doubt on the Bica et al. (2001A&A...366..827B 2001A&A...366..827B) criterion to
look for Possible Open Cluster Remnants. It seems mandatory to define
a better criterion to adopt for further investigations.
Description:
Observations were carried out with the AFOSC camera at the 1.82m
Copernico telescope of Cima Ekar (Asiago, Italy), in in the
photometric nights of December 17 and 18, 2001.
Objects:
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RA (2000) DE Designation (File)
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13 52 27.0 +76 10 24 NGC 5385 (table1.dat)
08 47 11.0 +12 36 06 NGC 2664 (table2.dat)
01 50 11.0 +27 04 00 Collinder 21 (table3.dat)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 43 Photometry of NGC 5385
table2.dat 103 64 Photometry of NGC 2664
table3.dat 103 52 Photometry of Collinder 21
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
6- 13 F8.3 pix Xpos X coordinates (1)
16- 23 F8.3 pix Ypos Y coordinates (1)
27- 33 F7.4 mag Vmag ?=99.9999 V band magnitude
37- 43 F7.4 mag e_Vmag ?=99.9999 error in Vmag
47- 53 F7.4 mag B-V ?=99.9999 (B-V) color index
57- 63 F7.4 mag e_B-V ?=99.9999 error in (B-V)
67- 73 F7.4 mag U-B ?=99.9999 (U-B) color index
77- 83 F7.4 mag e_U-B ?=99.9999 error in (U-B)
87- 93 F7.4 mag V-I ?=99.9999 (V-I) color index
97-103 F7.4 mag e_V-I ?=99.9999 error in (V-I)
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Note (1): The center is in (500.0,500.0) pixel. The scale is 0.473"/pix.
East is toward negative X, South toward negative Y.
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Acknowledgements: Giovanni Carraro
(End) Patricia Vannier [CDS] 03-Sep-2004