J/MNRAS/428/502 UBVI photometry of 7 open clusters (Carraro+, 2013)
Five old open clusters more in the outer Galactic disc.
Carraro G., Beletsky Yu., Marconi G.
<Mon. Not. R. Astron. Soc., 428, 502-517 (2013)>
=2013MNRAS.428..502C 2013MNRAS.428..502C
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD
Keywords: open clusters and associations: general -
open clusters and associations: individual: Berkeley 76, Haffner 4,
Ruprecht 10, Haffner 7, Haffner 11, Haffner 15
Abstract:
New photometric material is presented for six outer disc supposedly
old, Galactic star clusters: Berkeley 76, Haffner 4, Ruprecht 10,
Haffner 7, Haffner 11 and Haffner 15, which are projected against the
rich and complex Canis Major overdensity at 225°≤l≤248°,
-7°b≤-2°. This CCD data set, in the UBVI passbands, is used
to derive their fundamental parameters, in particular age and
distance. Four of the program clusters turn out to be older than 1Gyr.
This fact makes them ideal targets for future spectroscopic campaigns
aiming at deriving their metal abundances. This, in turn, contributes
to increase the number of well-studied outer disc old open clusters.
Only Haffner 15, previously considered an old cluster, is found to be
a young, significantly reddened cluster, member of the Perseus arm in
the third Galactic quadrant. As for Haffner 4, we suggest an age of
about half a Gyr. The most interesting result we found is that
Berkeley 76 is probably located at more than 17kpc from the Galactic
centre, and therefore is among the most peripherical old open clusters
so far detected. Besides, for Ruprecht 10 and Haffner 7, which were
never studied before, we propose ages larger than 1Gyr.
All the old clusters of this sample are scarcely populated and show
evidence of tidal interaction with the Milky Way, and are therefore
most probably in advanced stages of dynamical dissolution.
Description:
The targets were observed with the Y4KCAM camera attached to the Cerro
Tololo Inter-American Observatory (CTIO) 1-m telescope, operated by
the Small and Moderate Aperture Research Telescope System (SMARTS)
consortium during an observation run in 2005 November-December.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
clusters.dat 130 7 Basic parameters (table1) and fundamental
estimated parameters (table4) for the clusters
table2.dat 53 24 UBVI photometric observations of star clusters
be76.dat 128 3433 UBVI photometry of Berkeley 76
haff4.dat 128 6078 UBVI photometry of Haffner 4
haff7.dat 128 8319 UBVI photometry of Haffner 7
haff9.dat 128 7342 BVI photometry of Haffner 9
haff11.dat 128 8118 UBVI photometry of Haffner 11
haff15.dat 128 3330 UBVI photometry of Haffner 15
rup10.dat 128 5396 UBVI photometry of Ruprecht 10
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See also:
B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2013)
Byte-by-byte Description of file: clusters.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Cluster Cluster name
12 A1 --- n_Cluster [*] Note on Haffner 9 (1)
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 20 I2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 30 I2 arcsec DEs Declination (J2000)
32- 37 F6.2 deg RAdeg Right ascension in decimal degrees (J2000)
39- 44 F6.2 deg DEdeg Declination in decimal degrees (J2000)
46- 52 F7.3 deg GLON Galactic longitude
54- 59 F6.3 deg GLAT Galactic latitude
61- 65 F5.3 mag E(B-V)E ?=- Expected reddening (2)
67- 69 F3.1 arcmin Rad ?=- Cluster radius
71- 73 F3.1 arcmin e_Rad ? rms uncertainty on Rad
75- 78 F4.2 mag E(B-V) Redenning
80- 83 F4.2 mag e_E(B-V) ? rms uncertainty on E(B-V)
85- 89 F5.2 mag MOD Distance modulus from V band
91- 94 F4.2 mag e_MOD ? rms uncertainty on MOD
96- 99 F4.1 kpc Dist ?=- Heliocentric distance
101 A1 --- l_Age [~] Limit flag on Age
102-105 F4.2 Gyr Age ?=- Age
107 A1 --- l_Z [~] Limit flag on Z
108-112 F5.2 pc Z Height below the Galactic plane
114 A1 --- l_RGC [~] Limit flag on RGC
115-119 F5.2 kpc RGC Galactocentric distance
121-130 A10 --- FileName Name of the table with photometry
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Note (1): For Haffner 9, as the cluster was not in tables 1 and 4,
all parameters are from Hasegawa et al., 2008PASP...60.1267H 2008PASP...60.1267H,
and E(V-I) is the value quoted in E(B-V) column.
Note (2): expected reddening along the line of sight all the way to infinity
according to Schlegel, Finkbeiner & Davis (1998ApJ...500..525S 1998ApJ...500..525S) maps.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Cluster Cluster name
13- 16 I4 yr Obs.Y Observation date (year)
18- 25 A8 "month" Obs.M Observation date (month)
27- 28 I2 d Obs.D Observation date (day)
30 A1 --- Band [UBVI] Observed band
33- 43 A11 s Texp Exposure time(s)
45- 48 F4.2 --- AirM0 Lower value of Airmass interval
49 A1 --- --- [-]
50- 53 F4.2 --- AirM1 Upper value of Airmass interval
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Byte-by-byte Description of file: be*.dat haff*.dat rup*.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequential number within the cluster (1)
7- 14 F8.3 pix Xpos X position
17- 24 F8.3 pix Ypos Y position
26- 36 F11.7 deg RAdeg Right ascension (J2000)
38- 48 F11.7 deg DEdeg Declination (J2000)
52- 58 F7.4 mag Umag ?=99.9999 Johnson U magnitude
62- 68 F7.4 mag e_Umag ?=99.999 rms uncertainty on Umag
72- 78 F7.4 mag Bmag ?=99.9999 Johnson B magnitude
82- 88 F7.4 mag e_Bmag ?=99.999 rms uncertainty on Bmag
92- 98 F7.4 mag Vmag ?=99.9999 Johnson V magnitude
102-108 F7.4 mag e_Vmag ?=99.999 rms uncertainty on Vmag
112-118 F7.4 mag Imag ?=99.9999 Cousins I magnitude
122-128 F7.4 mag e_Imag ?=99.999 rms uncertainty on Imag
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Note (1): Stars will be identified as <[CBM2013] Berkeley 76 NNNN>,
<[CBM2013] Haffner NN NNNN> and <[CBM2013] Ruprecht 10 NNNN> in Simbad.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Dec-2013