J/MNRAS/432/3349 Galactic star clusters structural parameters (Camargo+, 2013)
Towards a census of the Galactic anticentre star clusters.
III. Tracing the spiral structure in the outer disc.
Camargo D., Bica E., Bonatto C.
<Mon. Not. R. Astron. Soc., 432, 3349-3360 (2013)>
=2013MNRAS.432.3349C 2013MNRAS.432.3349C (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Morphology
Keywords: Galaxy: disc - open clusters and associations: general -
Galaxy: structure
Abstract:
In this paper, we investigate the nature of 27 star cluster
candidates, most of them projected towards the Galactic anticentre. We
derive fundamental parameters for 20 confirmed clusters, among these 7
are new identifications. Four of the remaining are uncertain cases
that require deeper photometry to establish their nature, and four are
probably field fluctuations. In addition, we provide a partial census
of the open clusters towards the Galactic anticentre. We also include
in this study some interesting objects outside the anticentre region,
in the second and third Galactic quadrants, mainly in the Perseus and
outer arms. These clusters confirm the extension of the outer arm
along the third quadrant. We also point out that the embedded cluster
FSR 486, at a distance of 7.2±1.3kpc from the Sun, is projected on
the line of sight of the Local Group irregular dwarf galaxy IC 10.
Thus, part of the unusual properties of IC 10 may be explained by a
Galactic contamination. We point out the importance of embedded
clusters in tracing the spiral structure.
Description:
We investigate the nature of 27 star cluster candidates. Out of this
total, 17 are located in the anticentre region in the sector
160°≤l≤200°, 5 in the second and 5 in the third Galactic
quadrants, outside the anticentre sector. 20 objects were confirmed as
star clusters and we derived their parameters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 114 20 Derived fundamental parameters for confirmed
star clusters in the present study
table3.dat 84 6 Structural parameters for clusters in
the current sample
tableb1.dat 114 54 Derived fundamental parameters for clusters
in Papers I, II, and III
tableb2.dat 78 27 Structural parameters for clusters in
Papers I, II, and III
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Byte-by-byte Description of file: table2.dat tableb1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Cluster Cluster name
13- 15 A3 --- Phase [EC OC ECt] Phase (1)
17- 18 I2 h RAh Optimized central right ascension (J2000)
20- 21 I2 min RAm Optimized central right ascension (J2000)
23- 26 F4.1 s RAs Optimized central right ascension (J2000)
28 A1 --- DE- Optimized central declination sign (J2000)
29- 30 I2 deg DEd Optimized central declination (J2000)
32- 33 I2 arcmin DEm Optimized central declination (J2000)
35- 38 F4.1 arcsec DEs Optimized central declination (J2000)
40- 43 F4.2 mag AV Absorption in V band
45- 49 F5.3 mag e_AV rms uncertainty on AV in the cluster's
central region
51- 54 I4 Myr Age Age from 2MASS photometry
56- 59 I4 Myr e_Age rms uncertainty on Age
61- 64 F4.2 kpc Dist Heliocentric distance
66- 69 F4.2 kpc e_Dist rms uncertainty on Dist
71- 75 F5.2 kpc RGC Galactocentric distance (2)
77- 80 F4.2 kpc e_RGC rms uncertainty on RGC
82- 87 F6.2 kpc xCG Galactocentric x position
89- 92 F4.2 kpc e_xCG rms uncertainty on xCG
94- 98 F5.2 kpc yCG Galactocentric y position
100-103 F4.2 kpc e_yCG rms uncertainty on yCG
105-109 F5.2 kpc zCG Galactocentric z position
111-114 F4.2 kpc e_zCG rms uncertainty on zCG
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Note (1): Evolurionary phase as follows:
EC = embedded cluster
OC = open cluster
ECt = transition cluster
Note (2): RGC calculated using R_☉-=7.2kpc as the distance of the Sun to the
Galactic centre (Bica et al., 2006, Cat. J/A+A/450/105)
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Byte-by-byte Description of file: table3.dat tableb2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Cluster Cluster name
14- 17 F4.2 arcmin/pix Scale arcmin to parsec scale
19- 24 F6.2 pc-2 sOK σOK in pc (1)
26- 29 F4.1 pc-2 e_sOK rms uncertainty on sOK
31- 34 F4.2 pc Rcore Core radius in pc
36- 39 F4.2 pc e_Rcore rms uncertainty on Rcore
41- 44 F4.1 pc RRDP Radial density profile radius in pc
46- 48 F3.1 pc e_RRDP rms uncertainty on RRDP
50- 54 F5.2 arcmin-2 sOK2 σOK in arcmin (1)
56- 59 F4.1 arcmin-2 e_sOK2 rms uncertainty on sOK2
61- 64 F4.2 arcmin Rcore2 Core radius in arcmin
66- 69 F4.2 arcmin e_Rcore2 rmd uncertainty onRcore2
71- 74 F4.1 arcmin RRDP2 Radial density profile radius in arcmin
76- 78 F3.1 arcmin e_RRDP2 rms uncertainty on RRDP2
80- 84 A5 --- DR ? Comparison field ring (only in table 3)
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Note (1): σ(R)=σbg+σO/(1+(R/Rcore)2), where
σbg is the residual background surface density of stars,
σO is the central density of stars and Rcore is the core radius.
To minimise degrees of freedom in RDP fits with the King-like profile
(see text), σbg was kept fixed (measured in the respective comparison
fields) while σ0 and Rcore were allowed to vary.
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History:
From electronic version of the journal
References:
Camargo et al., Paper I 2010A&A...521A..42C 2010A&A...521A..42C
Camargo et al., Paper II 2011MNRAS.416.1522C 2011MNRAS.416.1522C
Camargo et al., Paper III 2012MNRAS.423.1940C 2012MNRAS.423.1940C
(End) Patricia Vannier [CDS] 26-May-2017