2019ApJ...887...87Z

Query : 2019ApJ...887...87Z

2019ApJ...887...87Z - Astrophys. J., 887, 87-87 (2019/December-2)

The nearby, young, χ1 Fornacis cluster: membership, age, and an extraordinary ensemble of dusty debris disks.

ZUCKERMAN B., KLEIN B. and KASTNER J.

Abstract (from CDS):

Only four star clusters are known within ∼100 pc of Earth. Of these, the χ1 For cluster has barely been studied. We use the Gaia DR2 catalog and other published data to establish the cluster membership, structure, and age. The age of and distance to the cluster are ∼40 Myr and 104 pc, respectively. A remarkable, unprecedented aspect of the cluster is the large percentage of M-type stars with warm excess infrared emission due to orbiting dust grains-these stars lie in an annulus that straddles the tidal radius of the cluster. The χ1 For cluster appears to be closely related to two extensive, previously known, groups of comoving, coeval stars (the Tucana-Horologium and Columba Associations) that are spread over much of the southern sky. While Tuc-Hor and χ1 For are comoving and coeval, the difference in the frequency of their warm dusty debris disks at M-type stars could hardly be more dramatic.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Star clusters - Debris disks

Simbad objects: 27

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Number of rows : 27
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 THA MGr 00 00 -62.0           ~ 540 0
2 HD 20379 * 03 15 17.1096217128 -37 02 30.101168256   9.12 8.64     F5V 26 0
3 CD-37 1224 Er* 03 16 03.0660637872 -37 25 22.280431548   10.64 9.88     K0 17 0
4 HD 20484 * 03 16 32.7174881544 -35 41 28.242741048   7.17 7.03     A3V 29 0
5 HD 20707 * 03 18 52.9447830000 -36 07 37.542401400   8.54 8.18     F3V 40 0
6 HD 20854 * 03 20 09.4648662792 -40 17 40.178819760   9.52 9.07     F3V 18 0
7 CD-37 1263 * 03 22 20.0078754192 -36 38 13.820728380   10.64 9.90     G5 22 0
8 HD 21341 * 03 25 12.8129930808 -37 09 09.690298272   7.30 7.16   7.00 A4V 27 0
9 CD-36 1289 Ro* 03 25 51.9092678496 -35 56 25.555138764   10.53 10.014     F8 12 0
10 HD 21434 ** 03 25 58.9790138592 -35 57 29.826700128   7.588 7.304     A9V 22 0
11 Cl Alessi 13 OpC 03 27 32.7 -35 50 45           ~ 92 0
12 CD-36 1309 Er* 03 28 07.4408502912 -35 54 43.459143696   9.80 9.25     F8 19 0
13 * chi03 For B * 03 28 11.0342897088 -35 51 14.863491792   10.49 10.02     G7 9 0
14 * chi03 For * 03 28 11.5250223672 -35 51 12.336055704   6.63 6.53     A1V 44 0
15 HD 21881 * 03 30 35.4956784120 -30 20 05.775706464   8.65 8.24     F3V 36 0
16 HD 21955 ** 03 31 20.7985770402 -30 30 58.712896230   10.60 10.01 9.64 9.20 G7IV 31 0
17 HD 23380 * 03 43 27.8824084488 -33 30 08.163537192   8.77 8.38     F2V 30 0
18 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
19 HD 24121 * 03 48 51.3883461216 -40 38 35.565892692   10.44 9.80     F8/G0V 23 0
20 * i Eri Pu* 03 53 38.9473938024 -34 43 56.270304048   4.961 5.092     B6/7V 70 0
21 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
22 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 337 0
23 * eta Cha Pu* 08 41 19.5125857944 -78 57 48.105898056 5.02 5.351 5.453     B8V 246 0
24 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
25 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
26 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
27 * alf Pav SB* 20 25 38.85705 -56 44 06.3230 1.03 1.791 1.918     B2IV 285 1

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