J/AJ/161/102 VPDs and CMDs of Berkeley32, Berkeley98 and King23 (Sariya+, 2021)
Astrometric and photometric investigation of three old age open clusters in the
Gaia era: Berkeley 32, Berkeley 98, and King 23.
Sariya D.P., Jiang I.-G., Bisht D., Yadav R.K.S., Rangwal G.
<Astron. J., 161, 102 (2021)>
=2021AJ....161..102S 2021AJ....161..102S
ADC_Keywords: Clusters, open; Photometry, infrared; Optical; Proper motions;
Parallaxes, trigonometric
Keywords: Hertzsprung Russell diagram ; Star clusters ; Open star clusters ;
Initial mass function ; Orbit determination
Abstract:
Using the photometric and kinematical data from Gaia Data Release 2,
three old open clusters namely Berkeley32 (Be32), Berkeley98 (Be98),
and King23 are investigated. The latter two of these clusters are
poorly studied in the literature. The numbers of the most probable
cluster members are 563, 260, and 114 for Be32, Be98, and King23,
respectively, with membership probabilities higher than 80% and lying
within the clusters limiting radii. Mean proper motions (PMs;
µαcosδ and µδ) of the clusters are
determined as (-0.34±0.008, -1.60±0.006), (-1.34±0.007,
-3.22±0.008), and (-0.46±0.009, -0.87±0.012)mas/yr. The
errors mentioned in the PMs are the Gaussian fitting errors. The blue
straggler stars (BSS) in all three old clusters were found to exhibit
centralized radial distribution. The clusters' radii are determined as
9.4', 12.95', and 6.6' for Be32, Be98, and King23 using radial density
profiles. Ages of the clusters determined by isochrone fitting are
4.90±0.22, 3.23±0.15, and 1.95±0.22Gyr. The errors given
in the clusters ages are the internal errors. The mass function slopes
are found to be flatter than Salpeter's value for all three clusters.
All three clusters are found to be dynamically relaxed. Galactic
orbits are derived for these clusters, which demonstrate that the
studied clusters follow a circular path around the Galactic center.
Description:
To investigate the clusters under study, we used the data from Gaia
DR2. The ranges covered by Gaia bands, G, GBP, and GRP, in the optical
wavelengths are 330-1050nm, 330-680nm, and 630-1050nm, respectively
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig3.dat 147 4123 Vector point diagrams (VPDs) and color-magnitude
diagram (CMDs) of Berkeley 32
fig4.dat 145 2835 VPDs and CMDs of Berkeley 98
fig5.dat 144 1672 VPDs and CMDs of King 23
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/AcA/41/167 : UBV photometry in Berkeley 32 (Kaluzny+, 1991)
J/A+AS/133/387 : NGC 1817 and NGC 1807 proper motions (Balaguer-Nunnez+, 1998)
J/A+AS/131/89 : NGC 1750 + NGC 1758 proper motions (Tian+ 1998)
J/other/BASI/29.53 : UBVI photometry in Berkeley 32 (Richtler+, 2001)
J/A+A/463/789 : Blue stragglers in open clusters (Ahumada+, 2007)
J/A+A/480/79 : Abundances of giants in 5 Galactic clusters (Bragaglia+, 2008)
J/A+A/493/959 : UBV(RI)cHalpha photometry in omega Cen (Bellini+, 2009)
J/A+A/496/441 : Radial velocities of Berkeley 32 stars (Randich+, 2009)
J/MNRAS/399/2146 : Orbits of open clusters in the Galaxy (Wu+, 2009)
J/A+A/523/A48 : Gaia photometry (Jordi+, 2010)
J/A+A/535/A30 : Chemical abundance of 12 stars open clusters (Carrera+, 2011)
J/A+A/558/A53 : MW global survey of star clusters. II. (Kharchenko+, 2013)
J/MNRAS/430/3350 : Proper motions and membership in NGC 3766 (Yadav+, 2013)
J/ApJ/797/115 : HSTPROMO I. Observations and NGC7078 results (Bellini+, 2014)
J/A+A/584/A59 : Proper motions and membership in NGC 6366 (Sariya+, 2015)
J/A+A/593/A116 : Open clusters within 1.8 kpc of the Sun (Joshi+, 2016)
J/AJ/153/134 : PMs and photometry of stars in NGC 3201 (Sariya+, 2017)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)
J/other/RAA/18.126 : Membership catalog for M12 (NGC6218) stars (Sariya+, 2018)
J/A+A/619/A155 : Open cluster kinematics with Gaia DR2 (Soubiran+, 2018)
J/A+A/627/A35 : New open clusters Galactic anti-centre (Castro-Ginard+, 2019)
Byte-by-byte Description of file: fig3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/4123] Sequential Number
6- 12 F7.4 arcmin Dist [0.04/13] Radial distance from cluster sequence
(1)
14- 20 F7.4 mas plx [-3.78/4.18] Gaia DR2 parallax
22- 27 F6.4 mas e_plx [0.02/1] Uncertainty in plx
29- 35 F7.3 mas/yr pmRA [-12/11] Gaia DR2 proper motion along RA
37- 41 F5.3 mas/yr e_pmRA [0.04/1] Uncertainty in pmRA
43- 49 F7.3 mas/yr pmDE [-12/11.6] Gaia DR2 proper motion along DE
51- 55 F5.3 mas/yr e_pmDE [0.03/1] Uncertainty in pmDE
57- 63 F7.4 mag Gmag [7.73/20] Apparent Gaia DR2 G band magnitude
65- 70 F6.4 mag e_Gmag [0.0002/0.03] Uncertainty in Gmag
72- 78 F7.4 mag BPmag [7.66/20.8] Apparent Gaia DR2 blue passband
magnitude
80- 85 F6.4 mag e_BPmag [0.0003/0.1] Uncertainty in BPmag
87- 93 F7.4 mag RPmag [7.39/19.2] Apparent Gaia DR2 red passband
magnitude
95-100 F6.4 mag e_RPmag [0.0006/0.1] Uncertainty in RPmag
102-107 F6.2 % Memb [0/100] Membership probability percentage
109-110 I2 h RAh [06] Hour of Right Ascension (J2000) (2)
112-113 I2 min RAm [57/59] Minute of Right Ascension (J2000) (2)
115-127 F13.10 s RAs Second of Right Ascension (J2000) (2)
129 A1 --- DE- [+] Sign of the Declination (J2000) (2)
130-131 I2 deg DEd [06] Degree of Declination (J2000) (2)
133-134 I2 arcmin DEm [13/39] Arcminute of Declination (J2000) (2)
136-147 F12.9 arcsec DEs Arcsecond of Declination (J2000) (2)
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Note (1): The Berkeley 32 cluster radius is 9.4arcmin.
Note (2): Positions from Gaia DR2 but converted to J2000 when
obtained from CDS/VizieR.
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Byte-by-byte Description of file: fig4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/2835] Sequential Number
6- 12 F7.4 arcmin Dist [0.27/15] Radial distance from cluster sequence
(1)
14- 20 F7.4 mas plx [-2.19/2.79] Gaia DR2 parallax
22- 27 F6.4 mas e_plx [0.01/0.63] Uncertainty in plx
29- 34 F6.3 mas/yr pmRA [-3/-0.2] Gaia DR2 proper motion along RA
36- 40 F5.3 mas/yr e_pmRA [0.02/0.98] Uncertainty in pmRA
42- 47 F6.3 mas/yr pmDE [-4/-1] Gaia DR2 proper motion along DE
49- 53 F5.3 mas/yr e_pmDE [0.02/0.9] Uncertainty in pmDE
55- 61 F7.4 mag Gmag [10.2/20.1] Apparent Gaia DR2 G band magnitude
63- 68 F6.4 mag e_Gmag [0.0002/0.02] Uncertainty in Gmag
70- 76 F7.4 mag BPmag [10.2/20.6] Apparent Gaia DR2 blue passband
magnitude
78- 83 F6.4 mag e_BPmag [0.0009/0.07] Uncertainty in BPmag
85- 91 F7.4 mag RPmag [10.1/19.4] Apparent Gaia DR2 red passband
magnitude
93- 98 F6.4 mag e_RPmag [0.0005/0.07] Uncertainty in RPmag
100-105 F6.2 % Memb [0/100] Membership probability percentage
107-108 I2 h RAh [22] Hour of Right Ascension (J2000) (2)
110-111 I2 min RAm [40/45] Minute of Right Ascension (J2000) (2)
113-125 F13.10 s RAs Second of Right Ascension (J2000) (2)
127 A1 --- DE- [+] Sign of the Declination (J2000) (2)
128-129 I2 deg DEd [52] Degree of Declination (J2000) (2)
131-132 I2 arcmin DEm [07/38] Arcminute of Declination (J2000) (2)
134-145 F12.9 arcsec DEs Arcsecond of Declination (J2000) (2)
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Note (1): The Berkeley 98 cluster radius is 12.95arcmin.
Note (2): Positions from Gaia DR2 but converted to J2000 when
obtained from CDS/VizieR.
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Byte-by-byte Description of file: fig5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/1672] Sequential Number
6- 11 F6.4 arcmin Dist [0.02/10] Radial distance from cluster sequence
(1)
13- 19 F7.4 mas plx [-1.87/2.69] Gaia DR2 parallax
21- 26 F6.4 mas e_plx [0.02/0.73] Uncertainty in plx
28- 33 F6.3 mas/yr pmRA [-7.87/2] Gaia DR2 proper motion along RA
35- 39 F5.3 mas/yr e_pmRA [0.03/0.99] Uncertainty in pmRA
41- 46 F6.3 mas/yr pmDE [-3.98/5.85] Gaia DR2 proper motion along DE
48- 52 F5.3 mas/yr e_pmDE [0.03/0.95] Uncertainty in pmDE
54- 60 F7.4 mag Gmag [7.47/19.6] Apparent Gaia DR2 G band magnitude
62- 67 F6.4 mag e_Gmag [0.0002/0.02] Uncertainty in Gmag
69- 75 F7.4 mag BPmag [8.35/19.9] Apparent Gaia DR2 blue passband
magnitude
77- 82 F6.4 mag e_BPmag [0.0006/0.05] Uncertainty in BPmag
84- 90 F7.4 mag RPmag [6.59/19] Apparent Gaia DR2 red passband
magnitude
92- 97 F6.4 mag e_RPmag [0.0006/0.05] Uncertainty in RPmag
99-104 F6.2 % Memb [0/100] Membership probability percentage
106-107 I2 h RAh [07] Hour of Right Ascension (J2000) (2)
109-110 I2 min RAm [21/23] Minute of Right Ascension (J2000) (2)
112-124 F13.10 s RAs Second of Right Ascension (J2000) (2)
126 A1 --- DE- [-] Sign of the Declination (J2000) (2)
127-128 I2 deg DEd [0/2] Degree of Declination (J2000) (2)
130-131 I2 arcmin DEm Arcminute of Declination (J2000) (2)
133-144 F12.9 arcsec DEs Arcsecond of Declination (J2000) (2)
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Note (1): The King 23 cluster radius is 6.6 arcmin.
Note (2): Positions from Gaia DR2 but converted to J2000 when
obtained from CDS/VizieR.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 14-Apr-2021