J/MNRAS/483/5508 Three new Galactic star clusters (Ferreira+, 2019)
Three new Galactic star clusters discovered in the field of the open cluster
NGC 5999 with Gaia DR2.
Ferreira F.A., Santos J.F.C. Jr., Corradi W.J.B., Maia F.F.S., Angelo M.S.
<Mon. Not. R. Astron. Soc. 483, 5508-5517 (2019)>
=2019MNRAS.483.5508F 2019MNRAS.483.5508F (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Associations, stellar
Keywords: Galaxy: stellar content - open clusters and associations: general -
surveys: Gaia
Abstract:
We report the serendipitous discovery of three new open clusters,
named UFMG 1, UFMG 2 and UFMG 3 in the field of the intermediate-age
cluster NGC 5999, by using Gaia DR2 data. A colour-magnitude filter
tailored for a proper selection of main-sequence stars and red clump
giants turned evident the presence of NGC 5999 and these three new
stellar groups in proper motion space. Their structural parameters
were derived from King-profile fittings over their projected
stellar distributions and isochrone fits were performed on the
clusters cleaned colour-magnitude diagrams built with Gaia bands to
derive their astrophysical parameters. The clusters projected sky
motion were calculated for each target using our members selection.
Distances to the clusters were inferred from stellar parallaxes
through a bayesian model, showing that they are marginally consistent
with their isochronal distances , considering the random and
systematic uncertainties involved. The new clusters are located in the
nearby Sagittarius arm (d∼1.5kpc) with NGC 5999 at the background
(d∼1.8kpc). They contain at least a few hundred stars of nearly solar
metallicity and have ages between 100 and 1400Myr.
Description:
Clusters UFMG1, UFMG2, UFMG3 and NGC5999 memberlists.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 151 4 Astrophysical parameters for the new clusters
and NGC 5999
ngc5999.dat 139 405 NGC 5999 member list
ufmg1.dat 139 191 UFMG 1 member list
ufmg2.dat 139 592 UFMG 2 member list
ufmg3.dat 139 261 UFMG 3 member list
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Cluster name
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 19 F4.1 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 29 I2 arcsec DEs Declination (J2000)
31- 36 F6.2 deg GLON Galactic longitude
38- 42 F5.2 deg GLAT Galactic latitude
44- 49 F6.3 mas/yr pmRA* Proper motion along RA, pmRA*cosDE
51 I1 uas/yr e_pmRA* rms uncertainty on pmRA* (1)
53- 58 F6.3 mas/yr pmDE Proper motion along DE
60 I1 uas/yr e_pmDE rmns uncertainty on pmDE (1)
62- 64 F3.1 pc rlim Limiting radius, defined as the radius where
the stellar density reaches the sky level
66- 68 F3.1 pc e_rlim rms uncertainty on rlim
70- 72 F3.1 pc rc Core radius
74- 76 F3.1 pc e_rc rms uncertainty on rc
78- 81 F4.1 pc rt Tital radius
83- 85 F3.1 pc e_rt rms uncertainty on rt
87- 90 F4.2 [yr] logt Age
92- 95 F4.2 [yr] e_logt rms uncertainty on logt
97-101 F5.2 mag m-M Distance modulus
103-105 F3.1 mag e_m-M rms uncertainty on m-M
107-110 F4.2 --- c Contentration parameter (c=log(rt/rc))
112-115 F4.1 [-] [Fe/H] Metallicity
117-119 F3.1 [-] e_[Fe/H] rms uncertainty on [Fe/H]
121-124 F4.2 kpc Dist Distance
126-129 F4.2 kpc e_Dist rms uncertainty on Dist
131-134 F4.2 mag E(B-V) Reddening
136-139 F4.2 mag e_E(B-V) rms uncertainty on E(B-V)
141-143 I3 --- N Number of members
145-151 A7 --- FileName Name of the file with member list
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Note (1): proper motions are also affected by systematic uncertainties of
0.1mas/yr.
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Byte-by-byte Description of file: ngc5999.dat ufmg1.dat ufmg2.dat ufmg3.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension (J2000)
11- 20 F10.6 deg DEdeg Declination (J2000)
22- 28 F7.4 mag Gmag Gaia DR2 G magnitude (Vega)
30- 35 E6.4 mag e_Gmag rms uncertainty on Gmag (Vega)
37- 43 F7.4 mag BPmag Gaia DR2 BP magnitude (Vega)
45- 50 E6.4 mag e_BPmag rms uncertainty on BPmag (Vega)
52- 58 F7.4 mag RPmag Gaia DR2 RP magnitude (Vega)
60- 65 E6.4 mag e_RPmag rms uncertainty on RPmag (Vega)
67- 76 F10.8 --- Prob Membership probability
78- 83 F6.3 mas/yr pmRA* Gaia DR2 proper motion in right ascension
direction, pmRA*cosDE
85- 89 F5.3 mas/yr e_pmRA* rms uncertainty on pmRA*
91- 96 F6.3 mas/yr pmDE Gaia DR2 proper motion in declination
direction
98-102 F5.3 mas/yr e_pmDE rms uncertainty on pmDE
104-110 F7.4 mas Plx Gaia DR2 Absolute stellar parallax
112-117 F6.4 mas e_Plx rms uncertainty on Plx
119-124 F6.1 pc Dist ? Estimated distance
127-132 F6.1 pc e_Dist ? Error on estimated distance (lower value)
134-139 F6.1 pc E_Dist ? Error on estimated distance (upper value)
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Acknowledgements:
Filipe A. Ferreira, filipeandradeferreira(at)hotmail.com
(End) Patricia Vannier [CDS] 23-Apr-2019