2019A&A...626A..80C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:58:37

2019A&A...626A..80C - Astronomy and Astrophysics, volume 626A, 80-80 (2019/6-1)

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. and RUIZ-RODRIGUEZ D.

Abstract (from CDS):


Context. The Ophiuchus cloud complex is one of the best laboratories to study the earlier stages of the stellar and protoplanetary disc evolution. The wealth of accurate astrometric measurements contained in the Gaia Data Release 2 can be used to update the census of Ophiuchus member candidates.
Aims. We seek to find potential new members of Ophiuchus and identify those surrounded by a circumstellar disc.
Methods. 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 catalogue centred on the Ophiuchus cloud. 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.
Results. 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. The increased flexibility of the OPTICS and HDBSCAN algorithms enable these methods to identify a secondary cluster. We constructed a common sample containing 391 member candidates including 166 new objects, which have not yet been discussed in the literature. By combining the Gaia data with 2MASS and WISE photometry, we built the spectral energy distributions from 0.5 to 22µm for a subset of 48 objects and found a total of 41 discs, including 11 Class II and 1 Class III new discs.
Conclusions. Density-based clustering algorithms are a promising tool to identify candidate members of star forming regions in large astrometric databases. By combining the Gaia data with infrared catalogues, it is possible to discover new protoplanetary discs. If confirmed, the candidate members discussed in this work would represent an increment of roughly 40-50% of the current census of Ophiuchus.

Abstract Copyright: © ESO 2019

Journal keyword(s): astrometry - methods: data analysis - stars: pre-main sequence - circumstellar matter

VizieR on-line data: <Available at CDS (J/A+A/626/A80): table3.dat tablea1.dat tablea4.dat>

Status at CDS:   Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 31

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Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 348 OpC 03 44 34 +32 09.8           ~ 1227 1
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2978 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
4 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1020 0
5 THA 15-20 TT* 16 07 11.5876160594 -39 03 47.490881982   16.25 14.58 14.11 12.92 M0.5 73 0
6 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1
7 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
8 2MASS J16222099-2304025 TT? 16 22 21.0065613084 -23 04 02.356731899           ~ 9 0
9 2MASS J16233609-2402209 Y*? 16 23 36.09 -24 02 20.9       17.4 14.68 M5 16 0
10 BKLT J162448-244002 Y*O 16 24 48.0273776397 -24 40 05.379202628       16.94 14.80 M6.0 7 0
11 2MASS J16245652-2459381 Y*O 16 24 56.5281568867 -24 59 38.240847306       15.72   K5 9 0
12 IRAS 16226-2420 TT* 16 25 39.5828608249 -24 26 34.889477995       16.78 14.84 M2 36 0
13 Haro 1-6 Or* 16 26 03.0281201323 -24 23 36.193999164   14.15 14.01 12.38 10.80 K0 204 1
14 BKLT J162619-243726 TT* 16 26 19.5001363598 -24 37 27.489352509     16.67 15.46 13.32 M4.75 23 0
15 BKLT J162620-242840 Y*O 16 26 20.83872 -24 28 39.5724           ~ 14 0
16 2MASS J16262096-2408468 TT* 16 26 20.9768510017 -24 08 46.772555768           ~ 5 0
17 BKLT J162620-240854 TT* 16 26 20.9883194977 -24 08 51.870701161     16.52 14.87 13.11 M2 29 0
18 GSS 30 Y*O 16 26 21.38160 -24 23 04.0524           ~ 200 1
19 EM* SR 23 Y*O 16 26 57.5342897663 -24 46 05.959243449           K5 9 0
20 BBRCG 54 TT* 16 27 30.5336151268 -24 32 34.881848204       15.64 14.30 M2 18 0
21 2MASS J16273714-2359330 Y*O 16 27 37.1554467188 -23 59 33.066820001           ~ 8 0
22 [GY92] 398 Y*O 16 27 55.65360 -24 44 50.9028           ~ 9 0
23 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0
24 BKLT J162823-244140 Y*O 16 28 23.73984 -24 41 41.2224           ~ 6 0
25 HD 148352 Y*O 16 28 25.1696814272 -24 45 01.022216814   7.89 7.55     F2V 44 0
26 * alf Sco ** 16 29 24.45970 -26 25 55.2094 4.08 2.75 0.91 -0.64 -1.87 M0.5Iab+B3V: 690 1
27 CD-24 12692 TT* 16 29 34.4167178546 -24 52 29.413553952   11.19 10.75 10.54 10.18 G5 14 0
28 LDN 1709 DNe 16 31 34.8 -24 02 55           ~ 66 0
29 LDN 1689 DNe 16 32 22.5 -24 28 29           ~ 109 0
30 CD-23 12904 Em* 16 44 28.8363999152 -24 12 24.159602862   11.94 11.06     B5 9 0
31 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11535 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:58:37

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