J/AJ/170/149 TUBITAK UBV Photometry of Roslund 3 & Ruprecht 174 (Karagoz+, 2025)
A multidata approach to open clusters: Roslund 3 and Ruprecht 174 in CCD UBV and
Gaia DR3 context.
Karagoz H., Yontan T., Bilir S., Plevne O., Ak T., Ak S., Canbay R.,
Banks T.
<Astron. J., 170, 149 (2025)>
=2025AJ....170..149K 2025AJ....170..149K
ADC_Keywords: Clusters, open; Photometry, UBV; Optical; Proper motions;
Parallaxes, trigonometric; Colors
Keywords: Open star clusters ; Hertzsprung Russell diagram ; Stellar kinematics
Abstract:
A detailed analysis of the structural, astrophysical, kinematic, and
dynamical properties of the open clusters Roslund 3 and Ruprecht 174
is carried out using CCD UBV photometry in conjunction with
astrometric and photometric data from Gaia DR3. Membership
probabilities were computed via the UPMASK algorithm applied to Gaia
proper motions and trigonometric parallaxes, leading to the
identification of 198 likely members for Roslund 3 and 397 for
Ruprecht 174. Astrophysical parameters were derived using both the
classical approach, where parameters are independently determined, and
a Markov chain Monte Carlo technique, which estimates them
simultaneously. The agreement between the results from both methods
confirms their reliability and highlights the robustness of the
classical method. The reddening values were determined as
E(B-V)=0.410±0.046mag for Roslund 3 and E(B-V)=0.615±0.042mag for
Ruprecht 174. The estimated distances are d=1687±121pc for Roslund 3
and d=2385±163pc for Ruprecht 174. Both clusters exhibit
metallicities close to the solar value, with [Fe/H]=0.030±0.065dex
for Roslund 3 and [Fe/H]=0.041±0.064dex for Ruprecht 174. The
corresponding ages were found to be τ=60±6 and
τ=520±50Myr, respectively. The present-day mass function slopes
were found to be 1.18±0.13 for Roslund 3 and 1.53±0.30 for
Ruprecht 174, consistent with the canonical Salpeter value within
uncertainties. Galactic orbital analyses indicate that both clusters
are thin-disk members confined within the Solar circle. Additionally,
relaxation times and spatial distributions of stars suggest that both
clusters have reached dynamical relaxation and exhibit clear signs of
mass segregation.
Description:
The CCD UBV photometric observations of Roslund 3 and Ruprecht 174
were collected at the TUBITAK National Observatory (TUG) using the 1m
f/10 Ritchey-Chretien telescope (T100) located in Turkey. Observations
were performed on 2020 July 23 for Roslund 3 and on 2022 August 31 for
Ruprecht 174 and had a 21.5'x21.5' field of view. For Roslund 3, a
total of 32 images were obtained with exposure times ranging from 5 to
1600s in U, B, and V bands. Similarly, 41 images were collected for
Ruprecht 174 with exposure times between 1.5 and 1500s.
In addition to the UBV catalogs obtained from observations, Gaia DR3
data (I/355) were separately compiled for each cluster to utilize a
comprehensive analysis. These catalogs are utilized to determine the
membership probabilities of stars and to derive astrometric parameters
as well as astrophysical parameters based on recent Gaia data.
Objects:
--------------------------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------------------------
19 58 46.80 +20 30 32.0 Roslund 3 = Cl Roslund 3
20 43 25.39 +37 01 52.0 Ruprecht 174 = Cl Ruprecht 174
--------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table5.dat 155 10956 TUBITAK and Gaia DR3 catalogs for Roslund 3 and
Ruprecht 174
--------------------------------------------------------------------------------
See also:
I/317 : The PPMXL Catalog (Roeser+ 2010)
I/322A : UCAC4 Catalogue (Zacharias+, 2012)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/A+A/333/897 : Mass segregation in open clusters (Raboud+ 1998)
J/A+AS/141/491 : Chemical composition of halo and disk stars (Nissen+, 2000)
J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)
J/A+A/446/949 : Open clusters proper motions based on UCAC2 (Dias+, 2006)
J/A+A/504/681 : Integrated BVJHKs for 650 open clusters (Kharchenko+, 2009)
J/MNRAS/399/2146 : Orbits of open clusters in the Galaxy (Wu+, 2009)
J/MNRAS/407/2109 : Kinematic study of open clusters (Vande Putte+, 2010)
J/AJ/141/92 : BVI photometry of 10 distant open clusters (Janes+, 2011)
J/A+A/558/A53 : Milky Way global surv. of star clust. II. (Kharchenko+, 2013)
J/A+A/564/A79 : Proper motions of open clusters from UCAC4 (Dias+, 2014)
J/MNRAS/453/1095 : NGC 6866 UBVRI photometry (Bostanci+, 2015)
J/other/ApSS/355.267 : NGC 6811 CCD UBVRI photometry (Yontan+, 2015)
J/other/ApSS/361.126 : NGC 6819 CCD UBV photometry (Ak+, 2016)
J/other/ASpR/58.1900 : NGC 225 CCD UBV photometry (Bilir+, 2016)
J/other/ApSS/361.126 : NGC 6819 CCD UBV photometry (Ak+, 2016)
J/AJ/153/99 : Galactic outer disk: a field toward Tombaugh 1 (Carraro+, 2017)
J/other/AstBu/72.257 : Homogeneous Cat. of Open Cluster Param. (Loktin+, 2017)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)
J/MNRAS/478/5184 : UCAC5 open clusters membership & proper motion (Dias+, 2018)
J/MNRAS/479/5491 : Absolute parameters of 509 main-sequence stars (Eker+, 2018)
J/A+A/619/A155 : Open cluster kinematics with Gaia DR2 (Soubiran+, 2018)
J/A+A/623/A108 : Age of 269 GDR2 open clusters (Bossini+, 2019)
J/ApJS/245/32 : Newly identified star clusters in Gaia DR2 (Liu+, 2019)
J/A+A/623/A108 : Age of 269 GDR2 open clusters (Bossini+, 2019)
J/A+A/633/A99 : Gaia DR2 open clusters in the MW. II (Cantat-Gaudin+, 2020)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/MNRAS/494/4713 : Study of NGC 381, NGC 2360 and Berkeley 68 (Maurya+, 2020)
J/other/ApSS/366.68 : Czernik 2 & NGC 7554 CCD UBV photometry (Akbulut+, 2021)
J/MNRAS/504/356 : Updated parameters of 1743 open clusters (Dias+, 2021)
J/A+A/652/A102 : 3794 open clusters parameters (Hao+, 2021)
J/A+A/647/A19 : 3D Kinematics and age of OCs (Tarricq+, 2021)
J/AN/342/538 : Frolov 1 and NGC 7510 CCD UBV photometry (Yontan+, 2021)
J/AJ/163/191 : Photometry & astrometry in NGC 1664 & NGC 6939 (Koc+, 2022)
J/AJ/166/263 : UBV & Gaia DR3 photometry of King 6 & NGC 1605 (Gokmen+, 2023)
J/A+A/673/A114 : Improving the open cluster census. II. (Hunt+, 2023)
J/AJ/165/79 : Catalogs for Berkeley 68 and Stock 20 (Yontan, 2023)
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Cluster Open cluster name (1)
14- 17 I4 --- ID [1/6999] Identifier
19- 20 I2 h RAh Hour of right ascension (J2000)
22- 23 I2 min RAm Minute of right ascension (J2000)
25- 29 F5.2 s RAs Second of right ascension (J2000)
31- 32 I2 deg DEd Degree of declination (J2000)
34- 35 I2 arcmin DEm Arcminute of declination (J2000)
37- 41 F5.2 arcsec DEs Arcsecond of declination (J2000)
43- 48 F6.3 mag Vmag [9/21.3] Apparent magnitude in V-band
50- 54 F5.3 mag e_Vmag [1e-3/0.11] Uncertainty in Vmag
56- 61 F6.3 mag U-B [-4/3.3]? U-B color
63- 67 F5.3 mag e_U-B [1e-3/1]? Uncertainty in U-B
69- 74 F6.3 mag B-V [-0.62/5.51]? B-V color
76- 80 F5.3 mag e_B-V [1e-3/0.31]? Uncertainty in B-V
82- 87 F6.3 mag Gmag [7.5/21.22] Apparent magnitude in G-band from
Gaia DR3 (I/350)
89- 93 F5.3 mag e_Gmag [3e-3/0.05] Uncertainty in Gmag
95- 99 F5.3 mag BP-RP [3.8e-2/5.9]? Gaia DR3 BP-RP color
101- 105 F5.3 mag e_BP-RP [5e-3/7.9]? Uncertainty in BP-RP
107- 113 F7.3 mas/yr pmRA [-29.5/38.3]? Proper motion in direction of
right ascension from Gaia DR3
115- 120 F6.3 mas/yr e_pmRA [9e-3/16.5]? Uncertainty in pmRA
122- 129 F8.3 mas/yr pmDE [-101/56.2]? Proper motion in direction of
declination from Gaia DR3
131- 136 F6.3 mas/yr e_pmDE [0.01/11.71]? Uncertainty in pmDE
138- 143 F6.3 mas plx [-8.8/13.2]? Parallax from Gaia DR3
145- 149 F5.3 mas e_plx [9e-3/2.2]? Uncertainty in plx
151- 155 F5.3 --- Prob [0/1] Membership probability
--------------------------------------------------------------------------------
Note (1): Clusters as follows:
Roslund 3 = 3957 occurrences
Ruprecht 174 = 6999 occurrences
--------------------------------------------------------------------------------
History:
From electronic version of the journal
License: CC-BY-4.0
(End) Prepared by [AAS], Robin Leichtnam [CDS] 29-Jun-2026