2021AJ....162..171Y

Query : 2021AJ....162..171Y

2021AJ....162..171Y - Astron. J., 162, 171-171 (2021/October-0)

Extended tidal tails of IC 4756 detected by Gaia EDR3.

YE X., ZHAO J., ZHANG J., YANG Y. and ZHAO G.

Abstract (from CDS):

We report the discovery of emerged tidal tails around open cluster IC 4756 (∼1 Gyr) based on 644 members identified from Gaia EDR3. Three-dimensional spatial positions and two-dimensional tangential velocities (x,y,z,κ⋅µα*/ϖ,κ⋅µδ/ϖ) are utilized to determine the comoving member candidates of IC 4756. Using a Bayesian method, we correct the distance for each cluster member. Two tidal tails extend up to 180 pc and display an S shape in the X′ Y′ space (Cartesian coordinates focused on cluster center). A clean sequence of our members in the color-absolute-magnitude diagram indicates the coeval population and matches perfectly with the PARSEC isochrone with age from Bossini et al. Mass segregation is detected in this cluster as well. Finally, we derive the tidal radius and core radius of IC 4756 about 12.13 pc and 4.33 ± 0.75 pc, respectively.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Open star clusters - Stellar kinematics

Simbad objects: 21

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Number of rows : 21
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 Cl Blanco 1 OpC 00 03 04.1 -29 48 55           ~ 380 0
2 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
3 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
4 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
5 NGC 2232 OpC 06 27 45.6 -04 44 26           ~ 212 0
6 NGC 2451A OpC 07 42 55.4 -38 15 05           ~ 159 0
7 NGC 2451B OpC 07 44 22.6 -37 53 00           ~ 125 0
8 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
9 NGC 2506 OpC 08 00 02.3 -10 46 22   8.28 7.6     ~ 313 0
10 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
11 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
12 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
13 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
14 Cl Platais 9 OpC 09 11 49 -43 31.8           ~ 74 0
15 UBC 274 Cl* 10 24 46.52315092 -72 34 28.3836788           ~ 13 0
16 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
17 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
18 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0
19 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0
20 NGC 6774 OpC 19 16 17.6 -16 20 45           ~ 258 0
21 NGC 7092 OpC 21 31 04.0 +48 17 47           ~ 245 0

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