J/MNRAS/496/2021 New Galactic open clusters (Ferreira+, 2020)
Discovery and astrophysical properties of Galactic open clusters in dense
stellar fields using Gaia DR2.
Ferreira F.A., Corradi W.J.B., Maia F.F.S., Angelo M.S., Santos J.F.C.Jr.
<Mon. Not. R. Astron. Soc. 496, 2021-2038 (2020)>
=2020MNRAS.496.2021F 2020MNRAS.496.2021F (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Parallaxes, trigonometric ;
Proper motions ; Morphology
Keywords: Surveys - open clusters and associations: general -
Galaxy: stellar content
Abstract:
We report the discovery of 25 new open clusters resulting from a
search in dense low galactic latitude fields. We also provide, for the
first time, structural and astrophysical parameters for the new
findings and 34 other recently discovered open clusters using Gaia
DR2 data. The candidates were confirmed by jointly inspecting the
vector point diagrams and spatial distribution. The discoveries were
validated by matching near known objects and comparing their mean
astrometric parameters with the available literature. A
decontamination algorithm was applied to the three-dimensional
astrometric space to derive membership likelihoods for clusters stars.
By rejecting stars with low membership likelihoods, we built
decontaminated colour-magnitude diagrams and derived the clusters
astrophysical parameters by isochrone fitting. The structural
parameters were also derived by King-profile fittings over the stellar
distributions. The investigated clusters are mainly located within
3kpc from the Sun, with ages ranging from 30Myr to 3.2Gyr and
reddening limited to E(B-V)=2.5. On average, our cluster sample
presents less concentrated structures than Gaia DR2 confirmed
clusters, since the derived core radii are larger while the tidal
radii are not significantly different. Most of them are located in the
IV quadrant of the Galactic disc at low latitudes, therefore they are
immersed in dense fields characteristic of the inner Milky Way.
Description:
UFMG clusters parameters and memberlists.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
param.dat 362 59 Clusters parameters
members.dat 189 4593 Clusters memberlists
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/627/A35 : New open clusters in Galactic anti-centre (Castro-Ginard+ 2019)
J/A+A/635/A45 : 570 new open clusters in Galactic disc (Castro-Ginard+, 2020)
Byte-by-byte Description of file: param.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Name Cluster UFMG name (UFMGNN, UFMG4-UFMG62)
8- 10 I3 --- Sim2019 ? Cluster name according to Sim et al.,
2019JKAS...52..145S 2019JKAS...52..145S
12- 15 I4 --- Liu2019 ? Cluster name according to Liu et al.,
2019ApJS..245...32L 2019ApJS..245...32L
17- 22 A6 --- CG2020 Cluster name according to Castro-Ginard et
al. (2020, Cat. J/A+A/635/A45)
24- 25 I2 h RAh Right Ascension (J2000)
27- 28 I2 min RAm Right Ascension (J2000)
30- 34 F5.2 s RAs Right Ascension (J2000)
36 A1 --- DE- Declination sign (J2000)
37- 38 I2 deg DEd Declination (J2000)
40- 41 I2 arcmin DEm Declination (J2000)
43- 46 F4.1 arcsec DEs Declination (J2000)
48- 56 F9.5 deg RAdeg Cluster right ascension (J2000)
58- 66 F9.5 deg DEdeg Cluster declination (J2000)
68- 86 F19.15 deg GLON Cluster galactic longitude
88-107 F20.17 deg GLAT Cluster galactic latitude
109-112 I4 pc Dist Distance in pc
114-117 I4 pc e_Dist Distance uncertainty in pc
119-123 F5.2 --- m-M Distance modulus
125-128 F4.2 --- e_m-M Distance modulus uncertainty
130-133 F4.2 [yr] logt Age
135-138 F4.2 [yr] e_logt Age uncertainty
140-143 F4.2 mag E(B-V) Colour excess
145-148 F4.2 mag e_E(B-V) Colour excess uncertainty
150-153 I4 arcsec rlim Limiting radius in seconds of arc, defined as
the radius where the stellar density reaches
the sky level
155-156 I2 arcsec e_rlim Limiting radius uncertainty
158-160 I3 arcsec rc Core radius in seconds of arc
162-164 I3 arcsec e_rc Core radius in seconds of arc uncertainty
166-169 F4.2 pc rc-pc Core radius in pc
171-173 F3.1 pc e_rc-pc Core radius in pc uncertainty
175-178 I4 arcsec rt Tidal radius in seconds of arc
180-182 I3 arcsec e_rt Tidal radius in seconds of arc uncertainty
184-187 F4.1 pc rt-pc Tidal radius in pc
189-191 F3.1 pc e_rt-pc Tidal radius in pc uncertainty
193-198 F6.3 mas/yr pmRAcl Mean proper motion along RA of members,
pmRA*cosDE
200-204 F5.3 mas/yr s_pmRAcl Standard deviation of pmra of members
206-210 F5.3 mas/yr e_pmRAcl Standard deviation of pmra of members
over square root of Nmembers
212-217 F6.3 mas/yr pmDEcl Mean proper motion along DE of members
219-223 F5.3 mas/yr s_pmDEcl Standard deviation of pmde of members
225-229 F5.3 mas/yr e_pmDEcl Standard deviation of pmde of members
over square root of Nmemb
231-235 F5.3 mas plxcl Mean parallax of members
237-241 F5.3 mas s_plxcl Standard deviation of plx of members
243-247 F5.3 mas s_plxcl01 Standard deviation of plx of members added in
quadrature a systematic uncertainty of
0.1mas
249-253 F5.3 mas e_plxcl01 Standard deviation (s_plxcl01) of
plx of members over square root of Nmemb
255-257 I3 --- Nmemb Number of cluster members
259-276 F18.13 kpc Xgc Position X in Galactic cartesian coordinates
according to the Galactic center position
278-297 F20.14 kpc X Position X in Galactic cartesian coordinates
299-320 F22.16 kpc Y Position Y in Galactic cartesian coordinates
322-342 F21.16 kpc Z Position Z in Galactic cartesian coordinates
344-362 F19.13 kpc Rgc Distance from Galactic centre assuming the
Sun is at 8340pc
--------------------------------------------------------------------------------
Byte-by-byte Description of file: members.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg Right ascension (ICRS) at Ep=2015.5
13- 23 F11.7 deg DEdeg Declination (ICRS) at Ep=2015.5
25- 30 F6.4 mas Plx Absolute stellar parallax
32- 37 F6.4 mas e_Plx Standard error of parallax
39- 44 F6.3 mas/yr pmRA Proper motion in right ascension
direction, pmRA*cosDE
46- 50 F5.3 mas/yr e_pmRA Standard error of proper motion in right
ascension
52- 57 F6.3 mas/yr pmDE Proper motion in declination direction
59- 63 F5.3 mas/yr e_pmDE Standard error of proper motion in
declination
65- 71 F7.4 mag Gmag G-band mean magnitude (Vega)
73- 78 E6.4 mag e_Gmag Standard error of G-band mean magnitude
(Vega)
80- 86 F7.4 mag BPmag Integrated BP mean magnitude (Vega)
88-108 E21.19 mag e_BPmag Standard error of BP mean magnitude (Vega)
110-116 F7.4 mag RPmag Integrated RP mean magnitude (Vega)
118-123 E6.4 mag e_RPmag Standard error of RP mean magnitude (Vega)
125-131 F7.2 --- chi2 AL chi-square value
133-137 F5.1 --- NgAL Number of good observations AL
139-143 F5.3 --- E(BP/RP) BP/RP excess factor
145-148 F4.1 --- Nper Number of visibility periods used in
Astrometric solution
150-156 E7.4 --- pmRApmDECcor Correlation between proper motion in RA
and proper motion in DE
158-164 E7.4 --- plxpmRAcor Correlation between parallax and
proper motion in right ascension
166-172 E7.4 --- plxpmDECcor Correlation between parallax and
proper motion in declination
174-180 F7.5 --- pastrom Membership probability
182 I1 --- fmemb [1] Flag member
184-189 A6 --- Name UFMG cluster name (UFMGNN, UFMG4-UFMG62)
--------------------------------------------------------------------------------
Acknowledgements:
Filipe A. Ferreira, filipe1906(at)ufmg.br
(End) Filipe A. Ferreira [UFNG, Brasil], Patricia Vannier [CDS] 23-Jun-2020