2017ApJ...846L...1D

Query : 2017ApJ...846L...1D

2017ApJ...846L...1D - Astrophys. J., 846, L1-L1 (2017/September-1)

NGC 1866: first spectroscopic detection of fast-rotating stars in a young LMC cluster.

DUPREE A.K., DOTTER A., JOHNSON C.I., MARINO A.F., MILONE A.P., BAILEY J.I., CRANE J.D., MATEO M. and OLSZEWSKI E.W.

Abstract (from CDS):

High-resolution spectroscopic observations were taken of 29 extended main-sequence turnoff (eMSTO) stars in the young (∼200 Myr) Large Magellanic Cloud (LMC) cluster, NGC 1866, using the Michigan/Magellan Fiber System and MSpec spectrograph on the Magellan-Clay 6.5 m telescope. These spectra reveal the first direct detection of rapidly rotating stars whose presence has only been inferred from photometric studies. The eMSTO stars exhibit Hα emission (indicative of Be-star decretion disks), others have shallow broad Hα absorption (consistent with rotation >=150 km s–1), or deep Hα core absorption signaling lower rotation velocities (<=150 km s–1). The spectra appear consistent with two populations of stars-one rapidly rotating, and the other, younger and slowly rotating.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): globular clusters: individual: NGC 1866 - stars: emission-line, Be - stars: rotation - techniques: spectroscopic - techniques: spectroscopic

Nomenclature: Table 1: [DDJ2017] NN N=29 among (Nos 1-91).

Simbad objects: 33

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Number of rows : 33
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 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 298 1
2 NGC 1856 Cl* 05 09 30.290 -69 07 45.08   10.40 10.06     ~ 163 0
3 [DDJ2017] 61 Ro* 05 13 25.0437323376 -65 27 27.632553876 17.460 17.931 17.925   17.983 ~ 1 0
4 [DDJ2017] 30 Ro* 05 13 26.4932926992 -65 28 24.972441528 17.046 17.423 17.437   17.493 ~ 1 0
5 [DDJ2017] 40 Ro* 05 13 27.8668589760 -65 27 27.511669908 17.164 17.633 17.639   17.727 ~ 1 0
6 [DDJ2017] 15 Ro* 05 13 28.7555604720 -65 27 56.180966688 16.907 17.159 17.150   17.199 ~ 1 0
7 [DDJ2017] 1 Ro* 05 13 29.8690921608 -65 28 53.437587528 18.048 18.670 18.468   18.506 ~ 1 0
8 [DDJ2017] 58 Ro* 05 13 30.8327498376 -65 28 58.301842584 17.389 17.864 17.910   17.968 ~ 1 0
9 [DDJ2017] 26 Ro* 05 13 34.4036531376 -65 27 20.809231056 17.140 17.290 17.166   17.390 ~ 1 0
10 [DDJ2017] 88 Ro* 05 13 34.8965220576 -65 26 38.575158576 18.291 18.899 18.898   18.428 ~ 1 0
11 [DDJ2017] 65 Ro* 05 13 35.6822069808 -65 28 35.035439880 17.539 17.927 17.932   18.037 ~ 1 0
12 [DDJ2017] 56 Ro* 05 13 38.3606884296 -65 28 32.865323340 17.619 18.004 18.024   17.955 ~ 1 0
13 NGC 1866 GlC 05 13 38.920 -65 27 52.75           ~ 437 0
14 [DDJ2017] 10 Ro* 05 13 40.4634791736 -65 28 32.207341512 16.548 16.937 17.019   17.022 ~ 1 0
15 [DDJ2017] 62 Ro* 05 13 41.8621827192 -65 26 33.808758684 17.940 18.034 17.995   17.991 ~ 1 0
16 [DDJ2017] 14 Ro* 05 13 42.0567815376 -65 27 16.957468368           ~ 1 0
17 [DDJ2017] 3 Ro* 05 13 43.4716815528 -65 28 12.383013576 15.661 16.732 16.843   16.753 ~ 1 0
18 [DDJ2017] 67 Ro* 05 13 45.9269789928 -65 27 08.149756284 17.603 18.019 18.084   18.052 ~ 1 0
19 [DDJ2017] 83 Ro* 05 13 45.9654595992 -65 26 25.635368400 18.002 18.392 18.355   18.367 ~ 1 0
20 [DDJ2017] 91 Ro* 05 13 46.3307979720 -65 25 50.261696976 17.848 18.405 18.388   18.460 ~ 1 0
21 [DDJ2017] 31 Ro* 05 13 47.3304975385 -65 28 37.356329829 17.114 17.551 17.493   17.525 ~ 1 0
22 [DDJ2017] 36 Ro* 05 13 47.9331117216 -65 26 30.828720660 16.707 17.687 17.569   17.677 ~ 1 0
23 [DDJ2017] 89 Ro* 05 13 48.6162983448 -65 27 21.630635748 18.269 18.559 18.491   18.432 ~ 1 0
24 [DDJ2017] 78 Ro* 05 13 49.6841192232 -65 27 59.636981880 17.766 18.247 18.224   18.263 ~ 1 0
25 [DDJ2017] 48 Ro* 05 13 50.3187327384 -65 26 12.058286064 17.454 17.811 17.795   17.816 ~ 1 0
26 [DDJ2017] 71 Ro* 05 13 51.2016036624 -65 27 05.721130692 17.460 18.023 18.105   18.130 ~ 1 0
27 [DDJ2017] 12 Ro* 05 13 52.7982986904 -65 25 10.930980864 16.428 16.881 17.038   17.095 ~ 1 0
28 [DDJ2017] 79 EB* 05 13 53.6274132504 -65 26 59.025467400 18.127 18.306 18.314   18.290 ~ 2 0
29 [DDJ2017] 17 Ro* 05 13 54.5118084672 -65 28 05.102104908 18.134 18.679 18.723   18.705 ~ 1 0
30 [DDJ2017] 63 Ro* 05 13 55.1849403096 -65 27 29.778958332 17.272 17.911 17.987   18.010 ~ 1 0
31 [DDJ2017] 69 Ro* 05 13 58.9180113552 -65 26 26.923488180 17.503 18.006 18.030   18.096 ~ 1 0
32 [DDJ2017] 86 Ro* 05 14 02.4235690056 -65 26 16.472007096 17.809 18.222 18.240   18.421 ~ 1 0
33 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0

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