J/other/BASI/29.53 UBVI photometry in Berkeley 32 (Richtler+, 2001)
A study of the old galactic star cluster Berkeley 32.
Richtler T., Sagar R.
<Bull. Astron. Soc. India, 29, 53-70 (2001)>
=2001BASI...29...53R 2001BASI...29...53R
ADC_Keywords: Photometry, UBVRI ; Clusters, open
Keywords: Open star clusters: individual: Berkeley 32 ; star: evolution ;
HR diagram ; Mass functions ; Galactic disk
Abstract:
We present new CCD photometry of the distant old open star cluster
Berkeley 32 in Johnson V and Cousins I passbands. A total of about
3200 stars have been observed in a field of about 13'x13'. The
colour-magnitude diagram (CMD) in V, (V-I) has been generated down
to V=22mag. A broad but well defined main sequence is clearly visible.
Some blue stragglers, a well developed subgiant branch and a Red Clump
are also seen. By fitting isochrones to this CMD as well as to other
CMDs available in the literature, and using the Red Clump location,
the reddening, distance and age of the star cluster have been
determined. The cluster has a distance of about 3.3kpc, its radius
is about 2.4pc; the reddening E(B-V) is 0.08 mag and the age is about
6.3Gyr. By comparison with theoretical isochrones, a metallicity of
[Fe/H]~-0.2dex has been estimated.
Description:
The CCD observations have been obtained on 1999 March 22 with the 3.5m
telescope at Calar Alto Observatory, Spain, run by the Max-Planck
Institute for astronomy, Heidelberg. The focal reducer MOSCA attached
at the RC Cassegrain focus provided an effective f/2.7 focal ratio
(http://www.caha.es/caha/instruments/mosca/manual.html). The
observations have been carried out in the Johnson V and Cousins I
filters using the SITE 18b CCD chip. The pixel size is 0.53arcsec.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
be32.dat 60 3201 (VI) photometry in Berkeley 32
table6.dat 57 95 UBVI photometry of candidate giant branch and
blue straggler stars
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See also:
J/AcA/41/167 : UBV photometry in Berkeley 32 (Kaluzny+, 1991)
J/PASJ/56/295 : BVIc photometry of old open clusters (Hasegawa+, 2004)
J/A+A/480/79 : Abundances of giants in 5 Galactic clusters (Bragaglia+ 2008)
J/A+A/496/441 : Radial velocities of Berkeley 32 stars (Randich+ 2009)
J/MNRAS/368/471 : Berkeley 32 BVI photometry and spectroscopy (D'Orazi+ 2006)
Byte-by-byte Description of file: be32.dat
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Bytes Format Units Label Explanations
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6- 9 I4 --- Seq Running number
13- 19 F7.2 pix Xpos Pixel position (1pix=0.53arcsec) along X axis
23- 29 F7.2 pix Ypos Pixel position (1pix=0.53arcsec) along Y axis
31- 36 F6.3 mag Vmag Johnson V magnitude
40- 44 F5.3 mag e_Vmag Mean error on Vmag
47- 52 F6.3 mag (V-I) Color index with Cousins I
56- 60 F5.3 mag e_(V-I) Mean error on (V-I)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1 A1 --- C [RB] Candidate giant (R) or blue straggler (B)
3- 6 I4 --- Seq Star sequence number, as in "be32.dat"
8- 13 F6.2 pix Xpos Pixel position, as in "be32.dat"
15- 20 F6.2 pix Ypos Pixel position, as in "be32.dat"
22- 27 F6.2 pix Rpos Radius position from cluster center
29- 34 F6.3 mag Vmag Johnson V magnitude
35- 39 F5.3 mag (U-B) ? (U-B) Johnson color
40- 44 F5.3 mag (B-V) ? (V-B) Johnson color
45- 49 F5.3 mag (V-I) ? Johnson-Cousins color
50- 51 A2 --- --- [KM]
52- 54 I3 --- KM ? Number in Kaluzny + Mazur 1991AcA....41..167K 1991AcA....41..167K
56- 57 A2 --- Mm [PM] if Probable photometric Member
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History:
From WEBDA (http://www.univie.ac.at/webda/ftp/ocl/be032/richtler.dat.Z)
(End) Francois Ochsenbein [CDS] 08-Aug-2010