2023MNRAS.521.1399C

Query : 2023MNRAS.521.1399C

2023MNRAS.521.1399C - Mon. Not. R. Astron. Soc., 521, 1399-1407 (2023/May-1)

Discovery and description of two young open clusters in the primordial group of NGC 6871.

CASADO J. and HENDY Y.

Abstract (from CDS):

A primordial group of open clusters containing NGC 6871 is confirmed and described through Gaia DR3 data and the previous literature. It is a star-forming complex containing at least six young open clusters (OCs), including Teutsch 8, FSR 198, and Biurakan 2. Two nearby OCs (Casado 82 and Casado-Hendy 1) are newly identified and studied in detail and found to be also members of the cited group. The parameters of the components are sufficiently similar to postulate the case of at least six clusters born from a single giant molecular cloud. None of the cluster pairs of the group seems to be an authentic binary cluster, with the possible exception of the candidate pair Teutsch 8/FSR 198. Instead, NGC 6871 seems to be disintegrating, and the primordial group members appear to be dispersing out rapidly. Searching for new open clusters in the vicinity of young or grouped OCs using Gaia data is an efficient strategy to find new associated OCs forming primordial groups.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): Astrometry and celestial mechanics - astronomical data bases: miscellaneous - Hertzsprung-Russell and colour-magnitude diagrams - open clusters and associations: general

Nomenclature: Casado NN (No. 82) added. NAME Casado-Hendy 1 N=1.

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
2 NGC 1997 Cl* 05 30 34.44 -63 12 17.2   14.27 13.43     ~ 25 0
3 NGC 1980 OpC 05 35 15.5 -05 55 46     2.5     ~ 132 0
4 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
5 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
6 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 222 0
7 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 0
8 Cl Trumpler 24 OpC 16 57 00 -40 40.0     8.6     ~ 74 0
9 Gaia DR3 2059446855803012480 * 20 02 20.1471205905 +35 19 22.506145811           ~ 6 0
10 Teutsch 8 OpC 20 02 23.8 +35 18 38           ~ 21 0
11 [FSR2007] 0198 OpC 20 02 24.4 +35 39 54           ~ 30 0
12 Gaia DR3 2059447852234563712 * 20 02 33.5748007163 +35 25 44.470087281           ~ 3 0
13 Gaia DR3 2058698500692882560 * 20 02 52.5564923648 +35 25 17.469366132           ~ 2 0
14 Casado 82 OpC 20 03.7 +36 02           ~ 1 0
15 Gaia DR3 2059842542555949312 * 20 03 43.7581634717 +36 01 11.495084467           ~ 3 0
16 NGC 6871 OpC 20 06 07.9 +35 46 45   5.43 5.2     ~ 237 0
17 Cl Biurakan 1 OpC 20 07 30 +35 41.0           ~ 29 0
18 Cl Biurakan 2 OpC 20 09 12.4 +35 29 23           ~ 61 0
19 Cl Gulliver 17 OpC 20 10 37.3 +35 52 05           ~ 16 0
20 NAME Casado-Hendy 1 ? 20 11.4 +35 51           ~ 1 0
21 Cl Dolidze 3 OpC 20 15 28.3 +36 50 05           ~ 31 0
22 IC 4996 OpC 20 16 32.7 +37 38 46           ~ 187 0
23 Cl Berkeley 87 OpC 20 21 35.0 +37 25 14           ~ 141 0

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