J/MNRAS/466/4960 UBVRI and CT1T2 photometry of 15 open clusters (Piatti, 2017)
On the physical reality of overlooked open clusters.
Piatti A.E.
<Mon. Not. R. Astron. Soc., 466, 4960-4973 (2017)>
=2017MNRAS.466.4960P 2017MNRAS.466.4960P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry
Keywords: techniques: photometric - open clusters and associations: general
Abstract:
We present UBVRI and CT1T2 photometry for 15 catalogued open
clusters of relative high brightness and compact appearance. From
these unprecedented photometric data sets, covering wavelengths from
the blue up to the near-infrared, we performed a thorough assessment
of their reality as stellar aggregates. We statistically assigned to
each observed star within the object region a probability of being a
fiducial feature of that field in terms of its local luminosity
function, colour distribution and stellar density. Likewise, we used
accurate parallaxes and proper motions measured by the Gaia satellite
to help our decision on the open cluster reality. 10 catalogued
aggregates did not show any hint of being real physical systems; three
of them had been assumed to be open clusters in previous studies,
though. On the other hand, we estimated reliable fundamental
parameters for the remaining five studied objects, which were
confirmed as real open clusters. They resulted to be clusters
distributed in a wide age range, 8.0≤log(t yr-1)≤9.4, of solar
metal content and placed between 2.0 and 5.5kpc from the Sun. Their
ages and metallicities are in agreement with the presently known
picture of the spatial distribution of open clusters in the Galactic
disc.
Description:
The National Optical Astronomy Observatory Science Data Management
Archives (http://www.noao.edu/sdm/archives.php) interface were used to
download the whole set of publicly available calibration and programme
images. The data processing, the calibration to the standard
photometric systems and the point spread function photometry for the
programme fields were carried out altogether with some previously
studied objects, as described in Piatti et al. (2017, Cat.
J/MNRAS/466/392). We included here two catalogued open clusters (ESO
371-25 and 561-5) for which Washington CT1 images are publicly
available and had not been paid particular attention until now.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
clusters.dat 79 15 List of selected star clusters
table2.dat 193 765 UBVRI and CT1T2 data of stars in the field of
Alessi 14
table3.dat 193 1782 UBVRI and CT1T2 data of stars in the field of
ESO 211-9
table4.dat 193 3224 UBVRI and CT1T2 data of stars in the field of
ESO 260-6
table5.dat 193 968 UBVRI and CT1T2 data of stars in the field of
ESO 315-14
table6.dat 55 1205 R and C data of stars in the field of
ESO 371-25
table7.dat 193 460 UBVRI and CT1T2 data of stars in the field of
ESO 383-10
table8.dat 193 3071 UBVRI and CT1T2 data of stars in the field of
ESO 430-9
table9.dat 193 304 UBVRI and CT1T2 data of stars in the field of
ESO 437-61
table10.dat 193 1699 UBVRI and CT1T2 data of stars in the field of
ESO 493-3
table11.dat 55 1712 R and C data of stars in the field of
ESO 561-5
table12.dat 193 5494 UBVRI and CT1T2 data of stars in the field of
Hogg 9
table13.dat 193 4336 UBVRI and CT1T2 data of stars in the field of
Miller 1
table14.dat 193 2291 UBVRI and CT1T2 data of stars in the field of
NGC 5269
table15.dat 193 2338 UBVRI and CT1T2 data of stars in the field of
Ruprecht 5
table16.dat 193 2862 UBVRI and CT1T2 data of stars in the field of
Ruprecht 15
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See also:
J/MNRAS/466/392 : UBVRICT1T2 photometry of 7 open clusters (Piatti+, 2017)
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 Clustername
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 23 F4.1 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 33 I2 arcsec DEs Declination (J2000)
35- 42 F8.4 deg GLON Galactic longitude
44- 50 F7.4 deg GLAT Galactic latitude
52- 67 A16 --- Filters Filters
69- 79 A11 --- Table Name of the table with photometry
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Byte-by-byte Description of file: table[2345789].dat table1[023456].dat
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Bytes Format Units Label Explanations
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4- 7 I4 --- Star Star sequential number, within the cluster
9- 16 F8.3 pix Xpos X position
18- 25 F8.3 pix Ypos Y position
29- 34 F6.3 mag Vmag V magnitude
39- 43 F5.3 mag e_Vmag rms uncertainty on Vmag
46 I1 --- o_Vmag ? Number of measurements for Vmag
50- 55 F6.3 mag U-B ? U-B colour index
60- 64 F5.3 mag e_U-B ? rms uncertainty on U-B
67 I1 --- o_U-B ? Number of measurements for U-B
71- 76 F6.3 mag B-V ? B-V colour index
81- 85 F5.3 mag e_B-V ? rms uncertainty on B-V
88 I1 --- o_B-V ? Number of measurements for B-V
92- 97 F6.3 mag V-R ? V-R colour index
102-106 F5.3 mag e_V-R ? rms uncertainty on V-R
109 I1 --- o_V-R ? Number of measurements for V-R
113-118 F6.3 mag V-I ? V-I colour index
123-127 F5.3 mag e_V-I ? rms uncertainty on V-I
130 I1 --- o_V-I ? Number of measurements for V-I
134-139 F6.3 mag T1mag ? T1 magnitude
144-148 F5.3 mag e_T1mag ? rms uncertainty on T1mag
151 I1 --- o_T1mag ? Number of measurements for T1mag
155-160 F6.3 mag V-T1 ? V-T1 colour index
165-169 F5.3 mag e_V-T1 ? rms uncertainty on V-T1
172 I1 --- o_V-T1 ? Number of measurements for V-T1
176-181 F6.3 mag T1-T2 ? T1-T2 colour index
186-190 F5.3 mag e_T1-T2 ? rms uncertainty on T1-T2
193 I1 --- o_T1-T2 ? Number of measurements for T1-T2
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Byte-by-byte Description of file: table6.dat table11.dat
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Bytes Format Units Label Explanations
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3- 6 I4 --- Star Star sequential number, within the cluster
8- 15 F8.3 pix Xpos X position
17- 24 F8.3 pix Ypos Y position
27- 32 F6.3 mag T1mag T1 magnitude
34- 38 F5.3 mag e_T1mag rms uncertainty on T1mag
40 I1 --- o_T1mag ? Number of measurements for T1mag
42- 47 F6.3 mag C-T1 C-T1 colour index
49- 53 F5.3 mag e_C-T1 rms uncertainty on C-T1
55 I1 --- o_C-T1 Number of measurements for C-T1
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Nov-2019