2009A&A...508.1301B


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET19:59:07

2009A&A...508.1301B - Astronomy and Astrophysics, volume 508, 1301-1312 (2009/12-4)

Evidence of early disk-locking among low-mass members of the Orion Nebula Cluster.

BIAZZO K., MELO C.H.F., PASQUINI L., RANDICH S., BOUVIER J. and DELFOSSE X.

Abstract (from CDS):

We present new high-resolution spectroscopic observations for 91 pre-main sequence stars in the Orion Nebular Cluster (ONC) with masses in the range 0.10-0.25M carried out with the multi-fiber spectrograph flames attached to the UT2 at the Paranal Observatory. Our aim is to better understand the disk-locking scenario in very low-mass stars. We have derived radial velocities, projected rotational velocities, and full width at 10% of the Hα emission peak. Using published measurements of infrared excess (Δ(IC-K)), as disk tracer and equivalent width of the nead-infrared CaII line λ8542, mid-infrared difference [3.6]-[8.0]µm derived by Spitzer data, and 10% Hα width as diagnostic of the level of accretion, we looked for any correlation between projected angular rotational velocity divided by the radius (vsini/R) and presence of disk and accretion. For 4 low-mass stars, the cross-correlation function is clearly double-lined, indicating that the stars are SB2 systems. The distribution of rotation periods derived from our vsin i measurements is unimodal with a peak of a few days, in agreement with previous results for M<0.25M. The photometric periods were combined with our vsin i to derive the equatorial velocity and the distribution of rotational axes. Our <sini> is lower than the one expected for a random distribution, as previously found. We find no evidence of a population of fast rotators close to the break-up velocity. A clear correlation between vsini/R and Δ(IC-K) has been found. While a spread in the rotation rates is seen for stars with no circumstellar disk (Δ(IC-K)<0.3), stars with a circumstellar disk (Δ(IC-K)>0.3) show an abrupt drop in their rotation rates by a factor of ∼5. On the other hand, only a partial correlation between vsini and accretion is observed when other indicators are used. The X-ray coronal activity level (logLX/Lbol) shows no dependence on vsini/R, suggesting that all stars are in a saturated regime limit. The critical velocity is probably below our vsini detection limit of 9km/s. The ONC low-mass stars in our sample, close to the hydrogen burning limit, at present do not seem to be locked, but the clear correlation we find between rotation and infrared color excess suggests that they were locked once. In addition, the percentage of accretors seems to scale inversely to the stellar mass.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Orion Nebula Cluster - stars: low-mass, brown dwarfs - stars: pre-main sequence - stars: late-type - accretion, accretion disks - techniques: spectroscopic

Errata: + corrigendum vol. 533, p. C3 (2011)

Simbad objects: 107

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Number of rows : 107

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IC 348 OpC 03 44 34 +32 09.8           ~ 1245 1
2 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1246 0
3 2MASS J05343766-0526215 Y*O 05 34 37.6622171456 -05 26 21.522585761   20.875 19.723   15.302 M5 17 0
4 2MASS J05343976-0517243 Y*O 05 34 39.7669665337 -05 17 24.284740205   20.292 19.097   15.425 M5.5 15 0
5 2MASS J05344000-0526040 Y*O 05 34 39.9992372542 -05 26 03.984340161   20.947 19.566   15.080 M6 20 0
6 JW 52 Y*O 05 34 40.8282312697 -05 28 09.498860337 19.941 19.483 18.347   14.261 M5 26 0
7 V* IX Ori Or* 05 34 40.8649507843 -05 22 42.307245151 14.801 14.891 14.062   11.806 K1e 74 0
8 2MASS J05344162-0523574 Y*O 05 34 41.6230207428 -05 23 57.438981619   20.282 19.051   14.884 M5 22 0
9 2MASS J05344441-0526061 Y*O 05 34 44.4110586733 -05 26 06.093893823   20.316 19.172 17.29 14.807 M5 37 0
10 V* V772 Ori Or* 05 34 48.8269382939 -05 23 17.900200148 19.244 17.469 16.188   13.032 M1 44 0
11 2MASS J05345013-0519598 Y*O 05 34 50.1370614115 -05 19 59.934924111   21.688 20.353   16.185 M6 20 0
12 V* V1455 Ori Or* 05 34 50.8589308908 -05 29 25.083769806   18.720 17.575 16.15 14.149 M4.5 40 0
13 2MASS J05345099-0517565 Y*O 05 34 51.0028683734 -05 17 56.451529571   19.321 18.130   14.481 M5.5 27 0
14 2MASS J05345143-0513295 Y*O 05 34 51.4358435228 -05 13 29.466577721   18.660 17.477   14.143 M5 28 0
15 V* V1273 Ori Or* 05 34 54.1160053340 -05 22 26.553373396   20.766 19.483   15.397 M5.2 28 0
16 2MASS J05345439-0517211 Y*O 05 34 54.4012001297 -05 17 21.228728452   19.382 18.174   14.410 M5 27 0
17 2MASS J05345560-0529375 Y*O 05 34 55.6039679462 -05 29 37.540641578   19.573 18.414 16.88 14.630 M4.5 37 0
18 2MASS J05345675-0526372 Y*O 05 34 56.7597453083 -05 26 37.221784391   19.648 18.438 16.76 14.686 M5.5 36 0
19 2MASS J05345737-0514334 Y*O 05 34 57.3794267159 -05 14 33.509508582   22.526 20.396   15.635 M4.5 27 0
20 V* V1317 Ori Or* 05 34 57.8706058018 -05 28 42.006201994   16.1 19.82 17.95 16.327 M5.5 20 0
21 2MASS J05345819-0511536 Y*O 05 34 58.1956039278 -05 11 53.679692322   19.055 17.793   14.095 M5 30 0
22 2MASS J05345827-0525332 Y*O 05 34 58.2748856229 -05 25 33.270041282   19.493 18.285 16.41 14.118 M5 34 0
23 2MASS J05345869-0512261 * 05 34 58.6981020422 -05 12 26.139781859   21.027 19.736   15.609 M5.5 19 0
24 2MASS J05345918-0523078 Y*O 05 34 59.1895963672 -05 23 07.848914315   20.432 19.215   14.743 M4.5IV-M5V 31 0
25 JW 190 Y*O 05 34 59.3159392634 -05 23 32.824902641     19.903   15.064 M6 26 0
26 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2036 1
27 V* V2124 Ori Or* 05 35 02.7629482217 -05 32 02.839456261   20.825 19.775 18.67 15.646 M5e 24 0
28 V* V404 Ori Or* 05 35 03.0915736856 -05 22 37.829486880     19.290   14.073 M6 32 0
29 V* V2129 Ori Or* 05 35 03.2280720627 -05 17 53.294086203 19.403 20.689 19.107   14.887 M6 30 0
30 2MASS J05350343-0526100 Y*O 05 35 03.4329342563 -05 26 10.054215602   15.5 19.577 16.87 15.596 M4.5 25 0
31 V* V1481 Ori Or* 05 35 03.9207633283 -05 29 03.390896036 17.631 16.264 15.153 13.96 12.519 M2.7 55 0
32 V* V2136 Ori Or* 05 35 03.9651379337 -05 18 59.812569402   19.824 18.592   14.737 M4 36 0
33 2MASS J05350416-0522243 Y*O 05 35 04.1697693328 -05 22 24.377870850   19.924 18.963   15.103 M5 25 0
34 V* V2145 Ori Or* 05 35 04.8186214402 -05 22 38.741840817   18.755 17.662   14.245 M4.5 39 0
35 2MASS J05350571-0523540 Y*O 05 35 05.7174446392 -05 23 54.067127182   18.356 17.345   13.665 M5-M6 31 0
36 V* V2166 Ori Or* 05 35 06.4604584124 -05 31 09.249253603 20.707 19.900 18.942 17.36 15.044 M4.5 25 0
37 JW 288 Y*O 05 35 06.4631692326 -05 21 18.764532953   14.8 19.144   15.127 M5 32 0
38 JW 296 Y*O 05 35 06.6009927035 -05 26 50.928144911         13.957 M4.5e 30 0
39 2MASS J05350678-0520190 Y*O 05 35 06.7841616362 -05 20 19.028165981   15.9     16.382 M5.5 20 0
40 V* V1721 Ori Or* 05 35 06.8305905479 -05 10 38.503710269   19.456 18.077   14.244 M5 30 0
41 COUP 276 * 05 35 06.8893478638 -05 22 09.226715579   15.3     15.723 M6 27 0
42 2MASS J05350744-0526401 Y*O 05 35 07.4489926490 -05 26 40.190331364   20.082 18.617 17.85 14.724 M5 31 0
43 2MASS J05350825-0529121 Y*O 05 35 08.2574905067 -05 29 12.136869221   20.818 19.758 17.85 15.574 M4.5 22 0
44 V* V2185 Ori Or* 05 35 08.5263433305 -05 24 41.557109403   14.0 16.24 15.30 14.598 M4.5 26 0
45 2MASS J05350959-0527599 Y*O 05 35 09.5965814385 -05 28 00.101256132   14.3 16.62   14.759 M5-M6 22 0
46 2MASS J05351057-0533136 Y*O 05 35 10.5756270938 -05 33 13.621518675   19.990 18.685 16.91 14.477 M5 31 0
47 2MASS J05351088-0528007 Y*O 05 35 10.8877669737 -05 28 00.823252838   18.614 17.490 15.71 14.047 M4.5 27 0
48 2MASS J05351165-0524213 Y*O 05 35 11.6559720040 -05 24 21.456728826   14.1 16.59 15.44 14.468 M4.7e 38 0
49 V* V1276 Ori Or* 05 35 12.1607703762 -05 30 20.194282925   20.181 19.072 17.27 14.788 M5.2 44 0
50 JW 392 Y*O 05 35 12.70752 -05 27 10.6272     19.245 19.63 14.737 M6.2 37 0
51 2MASS J05351277-0520349 Y*O 05 35 12.7729647667 -05 20 34.933773084   14.6 19.5   15.731 M4.5-M6 33 0
52 V* V2231 Ori Or* 05 35 13.0415798305 -05 34 03.617336169   21.202 19.844 17.53 15.333 M5.5 32 0
53 2MASS J05351336-0522261 Y*O 05 35 13.3642196798 -05 22 26.140465909   12.7 18.03   14.302 M4.5-M5.5 32 0
54 2MASS J05351450-0529032 Y*O 05 35 14.5066542048 -05 29 03.321460381   20.526 19.718 17.42 15.855 M4.5 21 0
55 2MASS J05351534-0519021 Y*O 05 35 15.3517508162 -05 19 02.232365296 17.127 17.740 16.925   14.080 M5 30 0
56 JW 486 Y*O 05 35 15.6975985127 -05 28 15.569476552   15.1 18.948 18.37 15.087 M4.5 28 0
57 COUP J053516.0-052146 * 05 35 16.010 -05 21 47.00   13.2 18.013   14.352 M5.5 27 0
58 V* V1505 Ori Or* 05 35 16.2634549652 -05 31 00.781027633   19.620 18.465 16.94 14.744 M4.5 28 0
59 COUP 796 Y*O 05 35 16.3141556155 -05 20 25.258868594   14.0 18.963   14.885 M5 29 0
60 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1497 1
61 2MASS J05351678-0516533 Y*O 05 35 16.7863376584 -05 16 53.220335277   21.486 19.853   15.401 M4.5 24 0
62 2MASS J05351713-0512394 SB* 05 35 17.1399446059 -05 12 39.333157194   20.066 18.825   14.957 M5 17 0
63 V* V1508 Ori Or* 05 35 17.4777028713 -05 09 49.149986394   15.3     15.462 M5 19 0
64 2MASS J05351768-0524539 Y*O 05 35 17.6971614694 -05 24 54.083001355   12.9 14.90 13.76 14.627 M5.5e 31 0
65 V* V2320 Ori Or* 05 35 17.9773790126 -05 26 50.726234342   20.827 19.960 17.17 15.716 M4.5 31 0
66 2MASS J05351797-0530315 Y*O 05 35 17.9826567152 -05 30 31.608729539   20.206 19.205 17.44 14.930 M5.5 26 0
67 * tet Ori ** 05 35.3 -05 24           ~ 40 1
68 2MASS J05351820-0516340 Y*O 05 35 18.2049159585 -05 16 33.913168365 19.199 19.253 18.066   14.574 M4.5 24 1
69 2MASS J05351922-0527318 * 05 35 19.2320799628 -05 27 31.963125474   15.8 19.51 16.46 15.903 M6 17 0
70 2MASS J05352024-0513593 Y*O 05 35 20.2460838162 -05 13 59.399321825   15.7 20.792   15.161 M4.5 31 0
71 V* MY Ori Or* 05 35 20.2977016032 -05 30 39.564687252 18.483 17.308 16.185 14.48 13.270 M5e 47 0
72 2MASS J05352047-0529110 Y*O 05 35 20.4751082371 -05 29 11.130648577   20.299 19.058 17.17 15.080 M6.2 18 0
73 2MASS J05352083-0521300 Y*O 05 35 20.8385996922 -05 21 30.086011974   13.5 18.016   14.260 M4.5 31 0
74 V* V1399 Ori Or* 05 35 21.0492702938 -05 23 48.989001884 14.154 13.231 12.376   10.605 G8 60 0
75 V* V2379 Ori Or* 05 35 21.6270369773 -05 27 14.673373282   16.0 20.619 17.43 16.180 M5.5 28 0
76 V* V2386 Ori Or* 05 35 22.2843796483 -05 31 16.944032605   20.304 19.170 17.35 14.871 M5.5 39 0
77 V* V1340 Ori BY* 05 35 22.3807813841 -05 27 28.424588173   19.359 18.676 16.36 14.531 M4.5e 47 0
78 2MASS J05352431-0528441 Y*O 05 35 24.3132051582 -05 28 44.207233396   20.240 19.156   14.687 M6.5 25 0
79 JW 763 * 05 35 24.6957021925 -05 28 25.550537519   20.866 20.189   16.086 M5 19 0
80 V* V2456 Ori Or* 05 35 26.96616 -05 24 00.5940   19.678 18.463   15.294 M6 31 0
81 V* V1540 Ori Or* 05 35 27.5515262204 -05 28 31.034811553   18.123 16.969   13.485 M4.5 31 0
82 V* V1542 Ori Or* 05 35 27.8948310507 -05 28 02.228131373   18.131 17.023   13.566 M5 35 0
83 JW 840 Y*O 05 35 29.8969079164 -05 12 10.367734348 19.999 18.689 17.471   13.989 M5 25 0
84 V* V2486 Ori Or* 05 35 30.1449677910 -05 14 18.506996915   15.8     15.274 M4.5 25 0
85 2MASS J05353071-0524312 Y*O 05 35 30.7180719259 -05 24 31.272198761   19.719 18.811   14.647 M5 31 1
86 JW 865 Y*O 05 35 30.9642503698 -05 25 44.037571275   19.137 18.001   14.011 M5 32 1
87 V* V2495 Ori Or* 05 35 31.0325801391 -05 18 45.153045523   20.152 18.892   14.714 M6e 24 1
88 V* V1559 Ori Or* 05 35 31.4098712455 -05 28 16.498123075   19.915 19.026   14.804 M5 38 0
89 V* V1561 Ori Or* 05 35 31.6828956202 -05 30 04.174269791   19.673 18.503   14.072 M6 37 0
90 2MASS J05353361-0528506 Y*O 05 35 33.6128222070 -05 28 50.745737431   18.634 17.448   13.758 M5 33 0
91 2MASS J05353534-0511114 Y*O 05 35 35.3432953812 -05 11 11.458436424   18.683 17.490   14.058 M4.5 27 0
92 2MASS J05353761-0519441 * 05 35 37.6115057736 -05 19 44.184793024   20.802 19.517   15.533 M5.5 23 0
93 2MASS J05353859-0527369 Y*O 05 35 38.5971085756 -05 27 36.999989379   15.9 20.123   15.977 M4.5 18 0
94 V* V2560 Ori Or* 05 35 38.7243482647 -05 16 59.115072190   20.550 19.239   15.078 M6 26 0
95 JW 964 Y*O 05 35 42.6153349918 -05 26 08.249602540   19.510 18.208   14.312 M5.5 28 0
96 V* V2579 Ori Or* 05 35 42.7683179783 -05 11 54.766706860 16.905 15.338 14.281   12.221 K6-K7 38 0
97 2MASS J05354661-0522243 Y*O 05 35 46.6120115090 -05 22 24.391869299 19.101 18.269 17.104   13.834 M4.5 37 0
98 V* V2619 Ori Or* 05 35 54.1540110604 -05 17 10.447452119   21.163 19.954   15.489 M5.5 23 0
99 2MASS J05355498-0522355 Em* 05 35 54.9839905792 -05 22 35.585257274   20.994 19.850   15.776 M5.5 17 0
100 COUP 1612 Em* 05 35 55.4393406486 -05 23 43.128341751   19.494 18.268   14.633 M5 22 0
101 2MASS J05355676-0519579 Y*O 05 35 56.7680552446 -05 19 57.961312127   20.308 19.454   15.263 M6 20 0
102 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 888 1
103 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1613 0
104 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 315 0
105 NAME TW Hya Association As* 11 01.9 -34 42           ~ 839 0
106 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1009 1
107 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3131 1

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