J/MNRAS/371/1301 BVI photometry of six old open clusters (Carraro+, 2006)
Fundamental parameters of six neglected old open clusters.
Carraro G., Subramaniam A., Janes K.A.
<Mon. Not. R. Astron. Soc., 371, 1301-1310 (2006)>
=2006MNRAS.371.1301C 2006MNRAS.371.1301C
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Keywords: open clusters and associations: individual: Berkeley 44 -
open clusters and associations: individual: NGC 6827 -
open clusters and associations: individual: Berkeley 52 -
open clusters and associations: individual: Berkeley 56 -
open clusters and associations: individual: Skiff 1 -
open clusters and associations: individual: Berkeley 5
Abstract:
In this paper, we present the first BVI CCD photometry of six
overlooked old open clusters (Berkeley 44, NGC 6827, Berkeley 52,
Berkeley 56, Skiff 1 and Berkeley 5) and derive estimates of their
fundamental parameters by using isochrones from the Padova library.
We found that all the clusters are older than the Hyades, with ages
ranging from 0.8Gyr (NGC 6827 and Berkeley 5) to 4.0Gyr (Berkeley 56).
The latter is one of the old open clusters with the largest
heliocentric distance.
Description:
The observations were carried out using the 2-m Himalayan Chandra
Telescope (HCT) at the Indian Astronomical Observatory (IAO), located
at Hanle, India, and operated by Indian Institute of Astrophysics. The
CCD used for imaging is a 2kx4k CCD, where the central 2kx2k
pixels were used for imaging. The pixel size is 15m with an image
scale of 0.297arcsec/pix and the average seeing was 1.3 and 1.4arsec
on August 9 and 30, respectively.
Objects:
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RA (2000) DE Designation(s) (file)
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01 47 48 +62 56 Berkeley 5 = C 0144+626 (ber5.dat)
19 17 12 +19 28 Berkeley 44 = C 1915+194 (ber44.dat)
20 14 18 +28 58 Berkeley 52 = C 2012+288 (ber52.dat)
21 17 42 +41 54 Berkeley 56 = C 2115+416 (ber56.dat)
19 48 54 +21 12 NGC 6827 = NGC 6827 (ngc6827.dat)
00 58 24 +68 28 Skiff 1 = Cl Skiff 1 (skiff1.dat)
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
ber5.dat 75 2250 Berkeley 5 CCD BVI photometry
ber44.dat 75 12730 *Berkeley 44 CCD BVI photometry
ber52.dat 75 2973 Berkeley 52 CCD BVI photometry
ber56.dat 75 7117 Berkeley 56 CCD BVI photometry
ngc6827.dat 75 11742 NGC 6827 CCD BVI photometry
skiff1.dat 75 6486 *Skiff 1 CCD BVI photometry
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Note on ber44.dat : Control field, north of Berkeley 44 at
19:17:12+19:38:00 (J2000)
Note on skiff1.dat : Control field, east of Skiff 1 at
01:06:24+68:29:00 (J2000)
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Byte-by-byte Description of file: ber*.dat ngc6827.dat skiff1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Sequential number (1)
8- 15 F8.3 pix Xpos X position (2)
18- 25 F8.3 pix Ypos Y position (2)
29- 35 F7.4 mag Vmag ?=99.9999 V magnitude
39- 45 F7.4 mag e_Vmag ?=99.9990 rms uncertainty on Vmag
49- 55 F7.4 mag B-V ?=99.9999 B-V colour index
59- 65 F7.4 mag e_B-V ?=99.9990 rms uncertainty on B-V
69- 75 F7.4 mag V-I ?=99.9999 V-I colour index
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Note (1): Caution: for NGC 6827, the WEBDA number = Seq - 1 !
Note (2): North is up, east on the left. 1pix=0.297"
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History:
Copied at WEBDA, http://www.univie.ac.at/webda/archive_ngc.html and
http://www.univie.ac.at/webda/archive_anon.html
(End) Patricia Vannier [CDS] 15-May-2007