J/MNRAS/466/392 UBVRICT1T2 photometry of 7 open clusters (Piatti+, 2017)
Highly dynamically evolved intermediate-age open clusters.
Piatti A.E., Dias W.S., Sampedro L.M.
<Mon. Not. R. Astron. Soc., 466, 392-406 (2017)>
=2017MNRAS.466..392P 2017MNRAS.466..392P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CMT1T2V
Keywords: techniques: photometric - open clusters and associations: general
Abstract:
We present a comprehensive UBVRI and Washington CT1T2 photometric
analysis of seven catalogued open clusters, namely: Ruprecht 3, 9, 37,
74, 150, ESO 324-15 and 436-2. The multiband photometric data sets in
combination with 2MASS photometry and Gaia astrometry for the brighter
stars were used to estimate their structural parameters and
fundamental astrophysical properties. We found that Ruprecht 3 and ESO
436-2 do not show self-consistent evidence of being physical systems.
The remained studied objects are open clusters of intermediate age
(9.0≤log(t[yr-1])≤9.6), of relatively small size
(rcls∼0.4-1.3pc) and placed between 0.6 and 2.9kpc from the Sun. We
analysed the relationships between core, half-mass, tidal and Jacoby
radii as well as half-mass relaxation times to conclude that the
studied clusters are in an evolved dynamical stage. The total cluster
masses obtained by summing those of the observed cluster stars
resulted to be ∼10-15 per cent of the masses of open clusters of
similar age located closer than 2kpc from the Sun. We found that
cluster stars occupy volumes as large as those for tidally filled
clusters.
Description:
We downloaded Johnson UBV, Kron-Cousins RI and Washington C images
from the public website of the National Optical Astronomy Observatory
(NOAO) Science Data Management (SDM) Archives
(http://www.noao.edu/sdm/archives.php). They were obtained using a
4Kx4K CCD detector array (scale of 0.289-arcsec/pix) attached to the
1.0-m telescope at the Cerro Tololo Inter-American Observatory (CTIO),
Chile, in 2011 January 31-February 4 (CTIO programme no. 2011A-0114,
PI: Claria).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
cluster.dat 65 7 Selected star clusters
table3.dat 193 155 Ruprech 3
table4.dat 193 243 Ruprecht 9
table5.dat 193 2334 Ruprecht 37
table6.dat 193 182 Ruprecht 74
table7.dat 193 291 Ruprecht 150
table8.dat 193 134 ESO 324-15
table9.dat 193 114 ESO 436-02
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Byte-by-byte Description of file: cluster.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Cluster Cluster name
14- 15 I2 h RAh Cluster right ascension (J2000)
17- 18 I2 min RAm Cluster right ascension (J2000)
20- 24 F5.2 s RAs Cluster right ascension (J2000)
26 A1 --- DE- Cluster declination sign (J2000)
27- 28 I2 deg DEd Cluster declination (J2000)
30- 31 I2 arcmin DEm Cluster declination (J2000)
33- 36 F4.1 arcsec DEs Cluster declination (J2000)
38- 45 F8.4 deg GLON Cluster Galactic longitude
47- 54 F8.4 deg GLAT Cluster Galactic latitude
56- 65 A10 --- Table Name of the table with photometry
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Byte-by-byte Description of file: table[3456789].dat
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Bytes Format Units Label Explanations
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4- 7 I4 --- Star Star sequential number
9- 16 F8.3 pix Xpos X position
18- 25 F8.3 pix Ypos Y position
29- 34 F6.3 mag Vmag ?=99.999 V magnitude
39- 43 F5.3 mag e_Vmag ?=9.999 rms uncertainty on Vmag
46 I1 --- o_Vmag ?=9 Number of measurements for Vmag
50- 55 F6.3 mag U-B ?=99.999 U-B colour index
60- 64 F5.3 mag e_U-B ?=9.999 rms uncertainty on U-B
67 I1 --- o_U-B ?=9 Number of measurements for U-B
71- 76 F6.3 mag B-V ?=99.999 B-V colour index
81- 85 F5.3 mag e_B-V ?=9.999 rms uncertainty on B-V
88 I1 --- o_B-V ?=9 Number of measurements for B-V
92- 97 F6.3 mag V-R ?=99.999 V-R colour index
102-106 F5.3 mag e_V-R ?=9.999 rms uncertainty on V-R
109 I1 --- o_V-R ?=9 Number of measurements for V-R
113-118 F6.3 mag V-I ?=99.999 V-I colour index
123-127 F5.3 mag e_V-I ?=9.999 rms uncertainty on V-I
130 I1 --- o_V-I ?=9 Number of measurements for V-I
134-139 F6.3 mag T1mag ?=99.999 T1 magnitude
144-148 F5.3 mag e_T1mag ?=9.999 rms uncertainty on T1mag
151 I1 --- o_T1mag ?=9 Number of measurements for T1mag
155-160 F6.3 mag C-T1 ?=99.999 C-T1 colour index
165-169 F5.3 mag e_C-T1 ?=9.999 rms uncertainty on C-T1
172 I1 --- o_C-T1 ?=9 Number of measurements for C-T1
176-181 F6.3 mag T1-T2 ?=99.999 T1-T2 colour index
186-190 F5.3 mag e_T1-T2 ?=9.999 rms uncertainty on T1-T2
193 I1 --- o_T1-T2 ?=9 Number of measurements for T1-T2
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Aug-2019