J/A+A/626/A80 Census of Rho Oph candidate members from Gaia DR2 (Canovas+, 2019)
Census of ρ Ophiuchi candidate members from Gaia Data Release 2.
Canovas H., Cantero C., Cieza L., Bombrun A., Lammers U., Merin B.,
Mora A., Ribas A., Ruiz-Rodriguez D.
<Astron. Astrophys. 626, A80 (2019)>
=2019A&A...626A..80C 2019A&A...626A..80C (SIMBAD/NED BibCode)
ADC_Keywords: Molecular clouds ; Cross identifications ; Positional data
Keywords: astrometry - methods: data analysis - stars: pre-main sequence -
circumstellar matter
Abstract:
The Ophiuchus cloud complex is one of the best laboratories to study
the earlier stages of the stellar and protoplanetary disc evolution.
We constructed a control sample composed of 188 bona fide Ophiuchus
members. Using this sample as a reference we applied three different
density-based machine learning clustering algorithms (DBSCAN, OPTICS,
and HDBSCAN) to a sample drawn from the Gaia DR2 catalogue centred on
the Ophiuchus cloud that contains 2300 sources covering a sky area of
38deg2. The clustering analysis was applied in the five astrometric
dimensions defined by the three-dimensional Cartesian space and the
proper motions in right ascension and declination. The three
clustering algorithms systematically identify a similar set of
candidate members in a main cluster with astrometric properties
consistent with those of the control sample. We constructed a common
sample containing 391 member candidates including 166 new objects,
which have not yet been discussed in the literature. We built the SEDs
for a subset of 48 objects and found a total of 41 discs.
Description:
We begun by compiling a list of rho-Oph member candidates identified
as such by means of optical spectroscopy, X-ray emission, and/or
Spitzer photometry. This is the initial sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 92 532 Entire sample of candidate members
tablea1.dat 50 470 Initial sample
tablea4.dat 242 48 Photometry for subset of 48 candidate members
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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2- 13 F12.8 deg RAdeg Right ascension (ICRS) at epoch J2015.5
15- 26 F12.8 deg DEdeg Declination (ICRS) at epoch J2015.5
29- 38 F10.8 mas plx Parallax (J2015.5)
40- 51 F12.8 mas/yr pmRA* Proper motion in Right Ascension,
pmRA*cosDE (J2015.5)
53- 64 F12.8 mas/yr pmDE Proper motion in Declination (J2015.5)
66- 84 I19 --- GDR2 Gaia DR2 Source ID
87- 88 A2 --- Control Control sample membership (Y/N)
90- 92 A3 --- DOH Candidate member by Dbscan/Optics/Hdbscan
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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2- 18 A17 --- 2MASS 2MASS Source ID
20- 27 A8 --- Ref References (1)
29- 30 A2 --- Control Control Sample Membership
32- 50 I19 --- GDR2 ? Gaia DR 2 Source ID
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Note (1): References as follows:
1 = Wilking, 2008hsf2.book..351W 2008hsf2.book..351W
2 = Erickson et al., 2011AJ....142..140E 2011AJ....142..140E, Cat. J/AJ/142/140
3 = Dunham et al., 2015ApJS..220...11D 2015ApJS..220...11D, Cat. J/ApJS/220/11
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Byte-by-byte Description of file: tablea4.dat
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Bytes Format Units Label Explanations
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2- 20 I19 --- GDR2 Gaia DR2 Source ID
23- 30 E8.2 W/m2 GFlux Observed Flux at Gaia G passband
33- 40 E8.2 W/m2 e_GFlux 1 sigma error on GFlux
43- 50 E8.2 W/m2 BPFlux Observed Flux at Gaia G_BP passband
53- 60 E8.2 W/m2 e_BPFlux 1 sigma error on GbFlux
63- 70 E8.2 W/m2 RPFlux Observed Flux at Gaia G_RP passband
73- 80 E8.2 W/m2 e_RPFlux 1 sigma error on GrFlux
83- 90 E8.2 W/m2 JFlux Observed Flux at 2MASS J passband
93-100 E8.2 W/m2 e_JFlux 1 sigma error on JFlux
103-110 E8.2 W/m2 HFlux Observed Flux at 2MASS H passband
113-120 E8.2 W/m2 e_HFlux 1 sigma error on HFlux
123-130 E8.2 W/m2 KsFlux Observed Flux at 2MASS Ks passband
133-140 E8.2 W/m2 e_KsFlux 1 sigma error on KsFlux
143-150 E8.2 W/m2 W1Flux Observed Flux at WISE W1 passband
153-160 E8.2 W/m2 e_W1Flux 1 sigma error on W1Flux
163-170 E8.2 W/m2 W2Flux Observed Flux at WISE W2 passband
173-180 E8.2 W/m2 e_W2Flux 1 sigma error on W2Flux
183-190 E8.2 W/m2 W3Flux Observed Flux at WISE W3 passband
193-200 E8.2 W/m2 e_W3Flux 1 sigma error on W3Flux
203-210 E8.2 W/m2 W4Flux Observed Flux at WISE W4 passband
213-220 E8.2 W/m2 e_W4Flux 1 sigma error on W4Flux
223-233 A11 --- SED SED class (as detailed in Sect. 4.2)
236-242 A7 --- status Indicates previous observations (if any) (1)
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Note (1): Code as follows:
control = the source belongs to the control sample
new = there is no literature record of this source in SIMBAD
other = there is at least 1 literature record of the source in SIMBAD
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Acknowledgements:
Hector Canovas Cabrera, hcanovas(at)sciops.esa.in
(End) Hector Canovas Cabrera [ESA/ESAC], Patricia Vannier [CDS] 10-May-2019