J/MNRAS/492/5811 Clusterix 2.0 (Balaguer-Nunez+, 2020)
Clusterix 2.0:
a Virtual Observatory tool to estimate cluster membership probability.
Balaguer-Nunez L., Lopez del Fresno M., Solano E., Galadi-Enriquez D.,
Jordi C., Jimenez-Esteban F., Masana E., Carbajo-Hijarrubia J., Paunzen E.
<Mon. Not. R. Astron. Soc. 492, 5811 (2020)>
=2020MNRAS.492.5811B 2020MNRAS.492.5811B (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way; Clusters, open ; Proper motions;
Parallaxes, trigonometric
Keywords: methods: statistical, virtual observatory tools, proper motions,
open clusters and associations: general, open clusters and
associations: individual: NGC 2682, Clusterix 1
Abstract:
Clusterix 2.0 is a web-based, Virtual Observatory compliant,
interactive tool for the determination of membership probabilities in
stellar clusters based on proper-motion data using a fully
non-parametric method. In an area occupied by a cluster, the frequency
function is made up of two contributions: cluster and field stars. The
tool performs an empirical determination of the frequency functions
from the vector point diagram without relying on any previous
assumption about their profiles. Clusterix 2.0 allows us to search the
appropriate spatial areas in an interactive way until an optimal
separation of the two populations is obtained. Several parameters can
be adjusted to make the calculation computationally feasible without
interfering with the quality of the results. The system offers the
possibility to query different catalogues, such as Gaia, or upload a
user's own data. The results of the membership determination can be
sent via Simple Application Messaging Protocol (SAMP) to Virtual
Observatory (VO) tools such as Tool for OPerations on Catalogues And
Tables (TOPCAT). We apply Clusterix 2.0 to several open clusters with
different properties and environments to show the capabilities of the
tool: an area of five degrees radius around NGC 2682 (M67), an old,
well-known cluster; a young cluster NGC 2516 with a striking elongated
structure extended up to four degrees; NGC 1750 and NGC 1758, a pair
of partly overlapping clusters; the area of NGC 1817, where we confirm
a little-known cluster, Juchert 23; and an area with many clusters,
where we disentangle two overlapping clusters situated where only one
was previously known: Ruprecht 26 and the new Clusterix 1.
Description:
Membership probabilities given by Clusterix 2.0 and astrometric
parameters in the areas of eight open clusters: M67, NGC2516, NGC1817,
Juchert23, NGC1750, NGC1758, Ruprecht26, Clusterix01.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
clusters.dat 47 8 List of studied clusters
table6.dat 151 1045234 Astrometric parameters in the areas of 8 open
clusters: M67, NGC2516, NGC1817, Juchert23,
NGC1750, NGC1758, Ruprecht26, Clusterix01
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: clusters.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Cluster Cluster name
13- 14 I2 h RAh ? Simbad right ascension (J2000)
16- 17 I2 min RAm ? Simbad right ascension (J2000)
19- 20 I2 s RAs ? Simbad right ascension (J2000)
22 A1 --- DE- Simbad declination sign (J2000)
23- 24 I2 deg DEd ? Simbad declination (J2000)
26- 27 I2 arcmin DEm ? Simbad declination (J2000)
29- 30 I2 arcsec DEs ? Simbad declination (J2000)
32- 35 I4 --- Nmemb Number of members in table6
37- 47 A11 --- OName Other name
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 deg RAdeg Gaia DR2 right ascension (ICRS)
at epoch 2015.5 (ra)
12- 21 F10.6 deg DEdeg Gaia DR2 declination (ICRS) at
epoch 2015.5 (dec)
23- 30 F8.3 mas/yr pmRA Gaia DR2 proper motion in right ascension
direction (pmRA*cosDE) (pmra)
32- 36 F5.3 mas/yr e_pmRA Gaia DR2 standard error of proper motion in
right ascension direction (pmra_error)
38- 45 F8.3 mas/yr pmDE Gaia DR2 proper motion in declination
direction (pmdec)
47- 51 F5.3 mas/yr e_pmDE Gaia DR2 standard error of proper
motion in declination direction (pmdec_error)
53- 59 F7.4 mas Plx ? Gaia DR2 absolute stellar parallax
(parallax)
61- 66 F6.4 mas e_Plx ? Gaia DR2 standard error of parallax
(parallax_error)
68- 74 F7.4 mag BPmag ? Gaia DR2 BP mean magnitude
(photbpmean_mag)
76- 81 F6.4 mag e_BPmag ? Gaia DR2 Error on the BP mean flux
(photbpmeanfluxerror)
83- 89 F7.4 mag RPmag ? Gaia DR2 RP mean magnitude
(photrpmean_mag)
91- 96 F6.4 mag e_RPmag ? Gaia DR2 Error on the RP mean flux
(photrpmeanfluxerror)
98-104 F7.4 mag Gmag ? Gaia DR2 G mean magnitude (photgmean_mag)
106-111 F6.4 mag e_Gmag ? Gaia DR2 Error on the G mean flux
(photgmeanfluxerror)
113-119 F7.2 km/s RV ? Gaia DR2 spectroscopic radial velocity
(radial_velocity)
121-125 F5.2 km/s e_RV ? Gaia DR2 radial velocity error
(radialvelocityerror)
127-137 F11.9 --- Prob Membership probability from Clusterix
139 A1 --- Region Region assigned as input to Clusterix
141-149 A9 --- Cluster Cluster Name
151 A1 --- Mem [M/N] Clasification as member(M) or non (N)
--------------------------------------------------------------------------------
Acknowledgements:
Lola Balaguer-Nunez, lbalaguer(at)fqa.ub.edu
(End) Lola Balaguer-Nunez [ICCUB-IEEC, Spain] Patricia Vannier [CDS] 09-Mar-2020