J/other/RAA/15.2193 NGC 6819 3D members (Gao+, 2015)
3D cluster members and near-infrared distance of open cluster NGC 6819.
Gao X.-H., Xu S.-K., Chen L.
<Res. Astron. Astrophys., 15, 2193-2203 (2015)>
=2015RAA....15.2193G 2015RAA....15.2193G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Proper motions ; Radial velocities ;
Photometry, SDSS
Keywords: open clusters and associations: individual (NGC 6819) -
Hertzsprung-Russell and C-M diagrams -
stars: kinematics and dynamics - stars: distances
Abstract:
In order to obtain clean members of the open cluster NGC 6819, the
proper motions and radial velocities of 1691 stars are used to
construct a three-dimensional (3D) velocity space. Based on the DBSCAN
clustering algorithm, 537 3D cluster members are obtained. From the
537 3D cluster members, the average radial velocity and absolute
proper motion of the cluster are Vr=+2.30±0.04km/s and
(PMRA, PMDE)=(-2.5±0.5, -4.3±0.5)mas/yr, respectively. The proper
motions, radial velocities, spatial positions and color-magnitude
diagram of the 537 3D members indicate that our membership
determination is effective. Among the 537 3D cluster members, 15 red
clump giants can be easily identified by eye and are used as reliable
standard candles for the distance estimate of the cluster. The
distance modulus of the cluster is determined to be
(m-M)0=11.86±0.05mag (2355±54pc), which is quite consistent with
published values. The uncertainty of our distance modulus is dominated
by the intrinsic dispersion in the luminosities of red clump giants
(∼0.04mag).
Description:
In this paper, we attempt to obtain highly-accurate estimations of
cluster members of OC NGC 6819 based on the DBSCAN clustering
algorithm and highly -precise 3D kinematic data (proper motion and
radial velocity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 537 Fundamental parameters describing the
537 3D members
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See also:
J/MNRAS/358/795 : Variable stars in NGC 6819 field (Street+, 2005)
J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)
J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)
J/AJ/146/43 : WOCS. NGC 6819 (Platais+, 2013)
J/AJ/148/38 : WOCS. NGC 6819 RV survey (Milliman+, 2014)
J/AJ/148/51 : WOCS. NGC 6819 photometry (Anthony-Twarog+ 2014)
J/AJ/149/121 : WOCS. Abundances in NGC 6819 (Lee-Brown+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension (J2000)
11- 19 F9.5 deg DEdeg Declination (J2000)
21- 25 F5.2 km/s RV Radial velocity
28- 31 F4.2 km/s e_RV rms uncertainty on RV
34- 38 F5.2 mas/yr pmRA Proper motion along RA
41- 44 F4.2 mas/yr e_pmRA rms uncertainty on pmRA
47- 51 F5.2 mas/yr pmDE Proper motion along DE
54- 57 F4.2 mas/yr e_pmDE rms uncertainty pn pmDE
60- 65 F6.3 mag g'mag g' magnitude
67- 72 F6.3 mag g'-r' g'-r' colour index
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Apr-2016