2019ApJ...883..182S

Query : 2019ApJ...883..182S

2019ApJ...883..182S - Astrophys. J., 883, 182-182 (2019/October-1)

Tidal-locking-induced stellar rotation dichotomy in the open cluster NGC 2287?

SUN W., LI C., DENG L. and DE GRIJS R.

Abstract (from CDS):

Stars spend most of their lifetimes on the "main sequence" (MS) in the Hertzsprung-Russell diagram. The obvious double MSs seen in the equivalent color-magnitude diagrams characteristic of Milky Way open clusters (OCs) pose a fundamental challenge to our traditional understanding of star clusters as "single stellar populations." The clear MS bifurcation of early-type stars with masses greater than ∼1.6 M☉ is thought to result from a range in the stellar rotation rates. However, direct evidence connecting double MSs to stellar rotation properties has yet to emerge. Here, we show through analysis of the projected stellar rotational velocities (v sin i, where i represents the star's inclination angle) that the well-separated double MS in the young, ∼200 Myr old Milky Way OC NGC 2287 is tightly correlated with a dichotomous distribution of stellar rotation rates. We discuss whether our observations may reflect the effects of tidal locking affecting a fraction of the cluster's member stars in stellar binary systems. We show that the slow rotators could potentially be initially rapidly rotating stars that have been slowed down by tidal locking by a low-mass-ratio companion in a cluster containing a large fraction of short-period, low-mass-ratio binaries. This demonstrates that stellar rotation drives the split MSs in young, 300 Myr old star clusters. However, special conditions, e.g., as regards the mass-ratio distribution, might be required for this scenario to hold.

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

Journal keyword(s): Open star clusters - Star clusters - Stellar rotation

Simbad objects: 63

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Number of rows : 63
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 SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
4 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
5 NGC 1844 Cl* 05 07 29.910 -67 19 26.86   12.29 12.08     ~ 46 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 TYC 5957-411-1 * 06 44 27.6041583456 -20 36 42.320140452   11.02 10.97     ~ 9 0
8 HD 48851 * 06 44 39.4610599608 -20 24 46.128502080   9.13 9.17     B8V 14 0
9 TYC 5961-1882-1 * 06 44 47.3357707992 -20 53 18.873227472   11.06 10.97     ~ 9 0
10 TYC 5957-1103-1 * 06 44 49.6387261632 -20 29 07.405045548   11.65 11.48     ~ 7 0
11 TYC 5961-1468-1 * 06 44 49.7462881704 -20 47 40.686724140   11.08 10.98     ~ 8 0
12 TYC 5961-2622-1 * 06 44 58.3691182320 -20 40 58.136867040   11.49 11.32     ~ 8 0
13 TYC 5961-2990-1 * 06 45 05.2322028936 -20 50 01.195954080   10.99 10.89     ~ 7 0
14 TYC 5961-2987-1 * 06 45 05.8313884104 -20 47 28.329862992   10.63 10.58     ~ 10 0
15 BD-20 1525 * 06 45 05.9602433544 -20 40 38.635370832   10.80 10.75     ~ 10 0
16 TYC 5961-2742-1 * 06 45 07.4341305504 -20 53 43.088428644   10.90 10.78     ~ 9 0
17 TYC 5961-3345-1 * 06 45 07.8707431464 -20 53 22.748420148   10.84 10.89     ~ 9 0
18 BD-20 1529 ** 06 45 15.0914142600 -20 57 27.645868728   10.30 10.29 10.36   ~ 19 0
19 CPD-20 1561 * 06 45 17.0680519896 -20 39 35.672939640   10.98 10.93     A2Vn 14 0
20 HD 48965 * 06 45 19.8726592080 -20 30 53.797185576   9.70 9.83 9.98   B8/9IV 23 0
21 CPD-20 1565 * 06 45 24.9892915296 -20 40 25.415228712   10.71 10.71     B8 17 0
22 HD 48982 * 06 45 24.9919699488 -20 25 42.442048920   9.32 9.33     B9IV 17 0
23 CPD-20 1567 * 06 45 26.2597479936 -20 31 41.317320432   10.59 10.56     ~ 14 0
24 BD-20 1542 * 06 45 35.0033882904 -20 43 14.465722512   8.91 8.98     B9V 31 0
25 BD-20 1540 * 06 45 35.2767852144 -20 37 15.086776728   9.10 9.14     A0V: 27 0
26 TYC 5957-195-1 * 06 45 36.6868932936 -20 24 33.603092244   10.59 10.64     ~ 9 0
27 HD 49025 * 06 45 37.2744534072 -20 48 58.392679644   9.07 9.07     K1/2(III) 37 0
28 HD 49022 * 06 45 38.2415606688 -20 30 45.059222628 9.02 9.30 9.36     B8/9II 37 0
29 CPD-20 1584 * 06 45 39.9470322312 -20 47 28.338706428   11.24 11.15     A2V 19 0
30 HD 49024 * 06 45 40.8527406960 -20 41 36.991740048   7.74 7.85     A0 37 0
31 BD-20 1550 * 06 45 43.6255271544 -20 38 44.932212276   9.52 9.58     B8.5V 26 0
32 CPD-20 1590 * 06 45 44.2258133568 -20 30 49.815332964   11.15 11.06     ~ 17 0
33 HD 49069 * 06 45 49.4215178880 -20 51 43.183139436   8.28 8.35     B8V 34 0
34 CPD-20 1596 * 06 45 52.5804946896 -20 41 35.806126236           ~ 8 0
35 BD-20 1554 * 06 45 54.4779824352 -20 43 08.247675540   9.37 9.46     B9V 26 0
36 Cl* NGC 2287 AR 70 * 06 46 00.9496118856 -20 32 45.447492228   11.53 11.32     ~ 9 0
37 CPD-20 1601 * 06 46 02.4764588568 -20 44 24.278579916   10.33 10.26     A0IV 18 0
38 M 41 OpC 06 46 03.1 -20 43 07   4.89 4.5     ~ 308 0
39 CPD-20 1603 * 06 46 03.9118515672 -20 45 03.232070028 10.87 10.840 10.733 10.842   ~ 17 0
40 Cl* NGC 2287 AR 84 * 06 46 07.2729530928 -20 53 09.333609828           ~ 7 0
41 CPD-20 1608 * 06 46 07.6682356128 -20 38 36.060776808   11.97 11.8     ~ 10 0
42 Cl* NGC 2287 AR 86 * 06 46 07.9806531168 -20 52 29.731092276           ~ 7 0
43 CPD-20 1612 * 06 46 09.3587730120 -20 46 01.437671316   11.77 11.4     ~ 14 0
44 CPD-20 1611 * 06 46 09.7694130480 -20 35 27.354901056   11.5 11.5     kA1mA3 24 0
45 BD-20 1561 * 06 46 12.4478748840 -20 54 15.392059956   10.01 10.02     B9.5V 23 0
46 CPD-20 1614 * 06 46 12.9012223584 -20 31 41.554623252   11.57 11.56     ~ 9 0
47 TYC 5961-3055-1 * 06 46 20.8847239392 -20 55 28.641546336   11.44 11.41 11.74   ~ 7 0
48 NGC 2287 31 * 06 46 20.9349886176 -20 45 15.994508256   12.03 11.8     ~ 10 0
49 CPD-20 1620 * 06 46 21.2712118752 -20 51 22.307480712   10.7 10.6     A0.5V_sh: 19 0
50 NGC 2287 32 * 06 46 21.2965910808 -20 44 58.304667588   12.03 11.6     ~ 8 0
51 CPD-20 1623 * 06 46 22.7025101232 -20 41 02.096340720   11.44 11.31     ~ 11 0
52 CPD-20 1627 * 06 46 24.4361988312 -20 55 50.186840772   11.31 11.2     ~ 11 0
53 CPD-20 1625 * 06 46 24.5145441912 -20 36 57.219249312   11.41 11.29     ~ 14 0
54 HD 49184 * 06 46 25.4023216368 -20 40 14.986499628   9.101 9.142     A0III/IV 27 0
55 CPD-20 1629 * 06 46 26.2628507616 -20 50 00.885458688   11.52 11.39     A1Vn: 17 0
56 BD-20 1566 * 06 46 27.4330093752 -20 39 29.950512552   10.41 10.5     A3V 20 0
57 HD 49211 * 06 46 34.9662227136 -20 42 44.989128540   9.40 9.42     B9/A0IV/V 32 0
58 CPD-20 1637 * 06 46 42.5629277136 -20 38 18.375552168   10.81 10.9     A1V 27 0
59 BD-20 1571 * 06 46 47.9317281576 -20 39 33.949250424   10.97 10.81     A3V 23 0
60 CPD-20 1644 * 06 46 50.3962306704 -20 44 20.770347696   11.06 10.99     ~ 15 0
61 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
62 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
63 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0

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