2005AJ....130.1733W

Query : 2005AJ....130.1733W

2005AJ....130.1733W - Astron. J., 130, 1733-1751 (2005/October-0)

Optical spectroscopy of the surface population of the ρ Ophiuchi molecular cloud: the first wave of star formation.

WILKING B.A., MEYER M.R., ROBINSON J.G. and GREENE T.P.

Abstract (from CDS):

We present the results of optical spectroscopy of 139 stars obtained with the Hydra multiobject spectrograph. The objects extend over a 1.3 deg2 area surrounding the main cloud of the ρ Oph complex. The objects were selected from narrowband images to have Hα in emission. Using the presence of strong Hα emission, lithium absorption, location in the Hertzsprung-Russell diagram, or previously reported X-ray emission, we were able to identify 88 objects as young stars associated with the cloud. Strong Hα emission was confirmed in 39 objects with line widths consistent with their origin in magnetospheric accretion columns. Two of the strongest emission-line objects are young, X-ray-emitting brown dwarf candidates with M8 spectral types. Comparisons of the bolometric luminosities and effective temperatures with theoretical models suggest a median age for this population of 2.1 Myr, which is significantly older than the ages derived for objects in the cloud core. It appears that these stars formed contemporaneously with low-mass stars in the Upper Scorpius subgroup, likely triggered by massive stars in the Upper Centaurus subgroup.

Abstract Copyright: ∼

Journal keyword(s): ISM: Individual: Name: ρ Ophiuchi Cloud - Galaxy: Open Clusters and Associations: Individual: Name: Upper Scorpius - Stars: Formation - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/AJ/130/1733): table2.dat table3.dat table4.dat>

Nomenclature: Table 2: [WMR2005] JHHMMSS.s+DDMMSS.s N=140 = [WMR2005] N-NN N=151.

Simbad objects: 157

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Number of rows : 157
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 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
2 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
3 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
4 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
5 NAME Upper Centaurus Lupus MGr 15 24 -41.9           ~ 567 1
6 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
7 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
8 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 B1III+B1:V 898 0
9 BKLT J162457-241127 TT* 16 24 57.3035531928 -24 11 24.260006796       15.63 13.71 M3.5 22 0
10 [WMR2005] 2-22 TT? 16 25 01.4963665440 -24 28 58.936671372       16.27 13.85 M5III 9 0
11 [WMR2005] 2-14 TT* 16 25 24.0267914832 -23 56 56.502952152       16.85 15.15 M3 6 0
12 BKLT J162524-241542 TT* 16 25 24.2959958616 -24 15 40.161128328       16.49 14.46 M5 25 0
13 EM* SR 22 Or* 16 25 24.3512329440 -24 29 44.379021480       14.52 12.88 M0e 74 0
14 BKLT J162528-242301 * 16 25 28.8574378248 -24 22 59.936428668       16.64 15.12 M3.25 9 0
15 BKLT J162530-243915 PM* 16 25 29.8991533512 -24 39 15.926561964       15.37 14.15 M2 10 0
16 BKLT J162531-242124 * 16 25 31.5197802552 -24 21 22.600645128       18.64 17.02 K1.5 3 0
17 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 670 0
18 Elia 2-12 LP? 16 25 37.8129602328 -24 13 43.702998204       16.03 13.56 M4.25III 16 0
19 IRAS 16226-2420 TT* 16 25 39.58128 -24 26 34.9116       16.78 14.84 M2 52 0
20 BKLT J162547-243738 TT* 16 25 47.6813302248 -24 37 39.491603760     16.37 14.77 13.05 M3.5 32 0
21 WLY 2-10 TT* 16 25 50.5247210760 -24 39 14.565244608     15.49 13.83 12.30 K5.5 48 0
22 [WMR2005] 4-55 TT? 16 25 52.5756922536 -24 04 19.112527272       17.12 16.00 F9.5 2 0
23 WLY 2-11 TT* 16 25 56.0972220312 -24 30 14.944182804       16.80 14.52 M5 27 0
24 EM* SR 4 Or* 16 25 56.1659023848 -24 20 48.240627072     12.80 11.7 10.7 K0:Ve 216 1
25 GSS 20 TT* 16 25 57.5183458272 -24 30 31.792496832     16.37 14.77 13.05 K5.5 60 0
26 BKLT J162558-245245 TT* 16 25 58.94472 -24 52 48.3024       15.77 13.84 M4.5 18 0
27 [C81] 8 TT* 16 25 59.6585490528 -24 21 22.360431852       15.03 13.00 M5.5 37 0
28 BKLT J162601-242945 TT* 16 26 01.6091149584 -24 29 45.046071528       17.22 15.00 M3 22 0
29 VSSG 19 TT* 16 26 03.2977778400 -24 17 46.536135468     16.49 14.86 13.00 M2 42 0
30 [WMR2005] 2-19 TT* 16 26 05.4523042464 -23 55 41.355682284       15.85 13.75 M4.5 10 0
31 DoAr 24 TT* 16 26 17.0743951968 -24 20 21.594730920   16.06 14.21 14.02 11.57 K7.5V 126 1
32 RX J1626.3-2407 TT* 16 26 18.7877364192 -24 07 19.005442068       14.86 13.06 M3.5 32 0
33 BKLT J162619-243726 TT* 16 26 19.4992506984 -24 37 27.487128036     16.67 15.46 13.32 M4.75 36 0
34 [WMR2005] 3-26 TT? 16 26 20.5877920872 -25 03 29.201780484     12.56 12.20   ~ 2 0
35 BKLT J162620-240854 TT* 16 26 20.9876547816 -24 08 51.872620308     16.52 14.87 13.11 M2 40 0
36 [GY92] 5 Or* 16 26 21.5381846568 -24 26 00.994958844       18.30 15.80 M7 77 1
37 [GY92] 3 Or* 16 26 21.9078410496 -24 44 39.697627344       17.95 15.62 M6.5 62 0
38 [EWM2011] 6-39 TT? 16 26 22.5852822120 -23 58 19.575160104       17.43 16.09 K4 2 0
39 GSS 31 TT* 16 26 23.3684537424 -24 20 59.579380248   15.9 14.70 14.33 11.53 K0e 154 1
40 DoAr 25 TT* 16 26 23.6911292736 -24 43 13.888543800       12.65   K5 201 0
41 Elia 2-24 TT* 16 26 24.0886188024 -24 16 13.448569260   16.3 14.40 15.81 13.97 K6 208 1
42 [WMR2005] 4-18 TT* 16 26 24.2750111136 -24 01 15.553261488       17.95 15.83 M4.5 11 0
43 BKLT J162625-241430 TT* 16 26 25.6981027128 -24 14 27.823409340       18.06 15.79 M5.5 21 1
44 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 312 1
45 VSSG 29 LM* 16 26 27.8153977560 -24 26 41.853907500         17.85 M5 49 1
46 BKLT J162629-244813 * 16 26 29.2483495728 -24 48 16.368677208       17.51 16.45 G0 3 0
47 [GY92] 59 TT* 16 26 31.3666819344 -24 25 30.308255112         18.90 M3.75 23 1
48 WSB 34 TT* 16 26 32.9891547072 -24 00 16.774282548   18.5   16.02 14.13 M4.5 27 0
49 GSS 35 TT* 16 26 34.1761719864 -24 23 28.283473860     16.53 14.75 12.51 B3 254 1
50 BKLT J162636-241554 Or* 16 26 36.8350696008 -24 15 51.854365512       17.37 15.67 K7-M1 48 1
51 BKLT J162637-241602 TT* 16 26 37.1409194112 -24 15 59.873452128       17.72 15.51 M5 27 1
52 [GY92] 93 TT* 16 26 41.2666088952 -24 40 17.881012092       15.41 13.37 M5 65 0
53 [GY92] 107 * 16 26 42.7061416272 -24 22 22.984370400           M3 7 0
54 BKLT J162643-241112 TT* 16 26 43.1188173648 -24 11 09.460515264       14.83 13.30 K8 28 0
55 [GY92] 112 TT* 16 26 44.3020015896 -24 43 14.061995292     17.07 15.15 13.37 M3 48 0
56 BKLT J162644-244711 TT* 16 26 44.4225011640 -24 47 13.732795896       15.72 13.88 M4.5 26 0
57 [WMR2005] 4-13 TT* 16 26 46.1343428544 -23 58 10.095612888       17.63 15.52 M3 12 0
58 YLW 37 TT* 16 26 46.4288834880 -24 12 00.078675192   17.15   13.90 12.37 G3.5 65 0
59 [GY92] 122 Or* 16 26 47.0562943152 -24 44 29.784385248       17.41 15.19 M4.5 34 0
60 [GY92] 125 Or* 16 26 48.1139920344 -24 42 03.258808236       17.81 15.56 M3.75 24 0
61 WSB 40 TT* 16 26 48.6589514568 -23 56 34.141257060       14.45 12.92 K5.5 46 0
62 WL 18 TT* 16 26 48.9809680488 -24 38 25.152593208       19.33 17.38 M3.5 77 0
63 BKLT J162650-241354 Or* 16 26 50.4909558576 -24 13 52.248199008       16.82 14.78 M4.5 29 0
64 [WMR2005] 2-17 LP* 16 26 51.6759120408 -24 03 53.753969808       15.47 13.11 M4III 7 0
65 [WMR2005] 4-32 TT? 16 26 53.2757945544 -24 05 58.543214856       18.40 16.88 K0.5 2 0
66 BKLT J162654-241019 PM* 16 26 55.0135231440 -24 10 16.743318312       15.28 13.81 M3 5 0
67 BKLT J162656-241353 TT* 16 26 56.7836190744 -24 13 51.537326592       18.46 16.29 K7 40 0
68 BKLT J162657-245235 * 16 26 57.8916833040 -24 52 36.995100960       18.46 17.45 K5 4 0
69 EM* SR 24A TT* 16 26 58.5134422944 -24 45 36.722580480       14.15 12.87 K1 118 0
70 EM* SR 24 Y*O 16 26 58.53 -24 45 35.3           K2:e+M0.5e 114 0
71 [WMR2005] 4-42 TT? 16 26 59.0927374968 -23 56 38.923993680       17.21 15.95 ~ 1 0
72 [WMR2005] 4-63 TT* 16 27 06.5591911944 -24 07 03.209793672       17.53 15.34 M4.5 17 0
73 [GY92] 204 TT* 16 27 06.5924837856 -24 41 48.871282992       17.57 15.43 M5 113 0
74 BKLT J162708-241204 TT* 16 27 09.0794157000 -24 12 00.814867308       18.47 16.14 M2.5 39 0
75 BKLT J162714-245132 TT* 16 27 14.4890106840 -24 51 33.464339784   18.5 16.44 15.04 13.17 M4.5 41 1
76 BKLT J162715-245137 TT* 16 27 15.1289055168 -24 51 38.814347988   16.9 15.02 13.86 12.38 M2 78 0
77 BKLT J162716-244710 TT* 16 27 17.0735135784 -24 47 11.155084836   19.8   16.84 15.06 K1 30 0
78 ISO-Oph 123 TT* 16 27 17.5857757152 -24 05 13.700934204   20.3 18.9 17.67 15.47 M3.5 23 0
79 BKLT J162717-245316 * 16 27 18.0092963400 -24 53 17.253483612       18.65 16.63 M2.5 3 0
80 WSB 48 TT* 16 27 18.3586223184 -24 54 53.708812740   18.5   14.70 13.23 M3.75 34 0
81 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 193 1
82 [WMR2005] 4-62 TT? 16 27 20.4720993216 -23 58 42.326258304       18.73 17.42 M0-M3 2 0
83 WSB 49 TT* 16 27 22.9688005680 -24 48 07.138268784   16.9   15.06 13.31 M4.25 60 0
84 [GY92] 264 LM* 16 27 26.5812811008 -24 25 54.395321448       17.90 15.72 M8 60 0
85 [WMR2005] 3-7 TT* 16 27 28.7290526040 -24 54 31.792610592       16.02 14.32 M4.75 22 0
86 BBRCG 50 NIR 16 27 29.6 -24 31 54           ~ 6 0
87 BBRCG 54 TT* 16 27 30.5335023360 -24 32 34.879349616       15.64 14.30 M2 21 0
88 [GY92] 284 TT* 16 27 30.8467391952 -24 24 56.094396228       18.45 16.24 M3.25 56 0
89 [WMR2005] 4-12 TT? 16 27 31.0347402768 -24 03 44.365587156       18.76 17.63 ~ 1 0
90 [WMR2005] 1-19 TT? 16 27 31.3541787624 -23 59 08.278140156       14.14 13.12 M1 7 0
91 [GY92] 295 TT* 16 27 35.2627683216 -24 38 33.428056416       16.16 14.08 M4.5 53 0
92 [GY92] 297 Y*O 16 27 36.5262764280 -24 28 33.332095092       14.67 13.30 M2 14 0
93 [WMR2005] 4-54 TT* 16 27 37.9760910840 -23 57 23.929763832       15.45 13.71 M2.5 18 0
94 YLW 47 TT* 16 27 38.3206405584 -24 36 58.594880844       17.69 15.52 M0 104 0
95 Haro 1-11 TT* 16 27 38.3295904392 -23 57 32.512870116   17.3   13.66 12.30 K6 50 0
96 [GY92] 310 Or* 16 27 38.6295993720 -24 38 39.214842072         17.40 M8 70 0
97 DoAr 33 TT* 16 27 39.0123517344 -23 58 18.709495500   15.7   13.24 12.02 K4 100 0
98 ROX 27 TT* 16 27 39.4295731464 -24 39 15.527230272       15.76 14.03 M0+M4 137 0
99 CD-24 12689 Or* 16 27 40.2857881416 -24 22 04.130226300   12.91 11.533 11.11 10.00 K5e 301 0
100 [WMR2005] 2-34 TT* 16 27 41.8789613592 -24 04 27.211613916       15.21 13.39 M2 21 0
101 [GY92] 326 TT* 16 27 42.7019158944 -24 38 50.619050052         17.30 M2 45 0
102 [WMR2005] 3-21 TT* 16 27 45.2190978144 -25 03 32.859629424       15.92 14.09 M4.5 18 0
103 [WMR2005] 4-47 TT? 16 27 49.2550991544 -23 56 08.429949708       17.54 16.48 G2.5 2 0
104 Elia 2-36 TT* 16 27 49.8764029464 -24 25 40.232849484       13.69 12.19 A7 75 0
105 WLY 2-55 TT* 16 27 52.0872222936 -24 40 50.723707476     16.28 14.48 12.78 K7.5 85 0
106 EM* SR 10 Or* 16 27 55.5811084704 -24 26 18.029534748   15.23 14.19 13.91 11.95 M1.5e 88 0
107 [WMR2005] 4-8 ** 16 27 59.67576 -23 57 16.1244       18.75 16.99 M0 2 0
108 BKLT J162800-244819 TT* 16 27 59.9574061344 -24 48 19.319153868   17.3 17.42 15.83 13.44 M4.75 45 0
109 BKLT J162800-245340 TT* 16 28 00.0969713352 -24 53 42.786489192       15.56 13.51 M5 31 0
110 [WMR2005] 2-3 TT* 16 28 00.8071490136 -24 00 51.808889376       15.74 13.89 M3 17 0
111 [WMR2005] 4-61 TT? 16 28 04.7985306336 -23 56 07.873426824       18.49 17.26 K5 2 0
112 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
113 BKLT J162809-244847 * 16 28 09.8835219624 -24 48 47.434899492       17.54 16.66 K4.5 3 0
114 [WMR2005] 2-21 TT* 16 28 11.01072 -24 06 18.1116       16.40 14.27 M3.75 8 0
115 [WMR2005] 3-13 TT? 16 28 11.2922362584 -24 59 05.694528408       16.90 15.90 G7 1 0
116 BKLT J162812-245043 TT* 16 28 12.5407886328 -24 50 45.427150572       15.60 13.67 M3 19 0
117 [WMR2005] 4-51 TT? 16 28 14.4013989144 -23 57 51.860344932       18.67 17.49 G7 2 0
118 [WMR2005] 3-9 TT? 16 28 15.1225253472 -25 02 07.364097636       16.24 15.32 G9.5 1 0
119 [WMR2005] 3-19 TT? 16 28 15.5517373128 -25 03 48.903597468           K0 2 0
120 YLW 58 TT* 16 28 16.5129208176 -24 36 58.054939128   18.5   16.55 14.46 M4 119 0
121 [WMR2005] 4-58 Y*? 16 28 16.5622153944 -24 07 36.607734768       18.46 16.77 K6-M1 3 0
122 [WMR2005] 4-14 TT? 16 28 18.1038821184 -23 57 29.962644588       17.65 16.57 G0 1 0
123 [WMR2005] 3-12 TT* 16 28 19.2253958736 -24 57 34.136910540       15.21 13.54 M3 22 0
124 BKLT J162819-242611 * 16 28 20.0231466936 -24 26 11.095118052       16.90 15.69 G5 3 0
125 BKLT J162820-242319 TT* 16 28 20.0524786776 -24 23 17.902244004       17.69 15.55 M3.5 20 0
126 BKLT J162821-242155 TT* 16 28 21.5209703184 -24 21 55.065179772       16.97 14.95 M2.5 33 0
127 BKLT J162823-241835 * 16 28 23.3161699752 -24 18 33.950265408       16.42 14.38 M1.5III 3 0
128 EM* SR 20W TT* 16 28 23.3448796920 -24 22 40.668069288     15.79 16.29 14.60 K5 49 0
129 BKLT J162824-240934 TT* 16 28 24.3083152272 -24 09 31.852567332       16.52 14.60 M2 21 0
130 BKLT J162824-243543 TT* 16 28 24.8065925616 -24 35 43.496046708       16.78 14.79 M5 26 0
131 BKLT J162825-242820 * 16 28 25.0999413744 -24 28 19.853573988       14.25 12.46 M2III 9 0
132 BKLT J162828-245220 * 16 28 28.3143354480 -24 52 21.499201524       16.40 15.05 K6 9 0
133 [WMR2005] 4-44 TT? 16 28 28.3244810376 -23 58 50.123082216       18.37 17.17 ~ 2 0
134 BKLT J162829-243121 * 16 28 29.3854203696 -24 31 20.766559836       17.78 16.56 K0 3 0
135 BKLT J162832-241526 TT* 16 28 32.5623911784 -24 15 24.713259768       18.30 15.95 M3.5 13 0
136 EM* SR 20 Or* 16 28 32.6876536896 -24 22 45.008526648   16.23   12.59   G7 90 0
137 [WMR2005] 4-50 TT? 16 28 36.2622975744 -24 00 42.816260232       17.85 16.28 K1 2 0
138 BKLT J162843-242253 TT* 16 28 43.0586665752 -24 22 52.197962016       16.54 14.47 M4.75 27 0
139 [WMR2005] 4-1 TT? 16 28 43.5738841536 -24 04 44.214504636       17.02 15.75 G0 2 0
140 EM* SR 13 Or* 16 28 45.2768168328 -24 28 18.905579112     13.60 12.40 10.9 M2e 142 0
141 BKLT J162847-243252 * 16 28 47.0112795288 -24 32 52.425888252       17.95 16.85 G7 2 0
142 BKLT J162854-244743 TT* 16 28 54.0781293792 -24 47 44.285434800   17.3   15.24 13.54 M2 57 0
143 [WMR2005] 4-56 TT? 16 28 59.2281371328 -24 05 15.314665236       18.74 17.04 G2.5 2 0
144 BKLT J162900-242639 * 16 28 59.9614965768 -24 26 39.018038172       16.20 15.20 G9 3 0
145 BKLT J162902-243111 * 16 29 01.9109344464 -24 31 10.739350776       18.30 17.39 G7.5 3 0
146 BKLT J162903-243002 * 16 29 03.7642059096 -24 30 02.243455236       18.25 16.54 M3 3 0
147 BKLT J162904-245140 TT* 16 29 03.9334920240 -24 51 41.468175000       16.53 14.49 M5.5 26 0
148 BKLT J162911-242215 * 16 29 11.5082000904 -24 22 14.960691840       18.89 17.80 G0.5 3 0
149 VSS II-42 * 16 29 12.7374271008 -24 23 55.378431960           M1.5III 12 0
150 BKLT J162920-242124 * 16 29 20.7259763880 -24 21 23.971314420       18.66 17.70 ~ 2 0
151 BKLT J162923-242751 * 16 29 23.5259874576 -24 27 50.711886900       18.35 17.48 K1 3 0
152 BKLT J162923-242909 * 16 29 23.8247430120 -24 29 10.344393744       17.13 16.11 G5 3 0
153 [WMR2005] 4-2 TT? 16 29 24.4095813024 -24 30 54.538519140       18.54 17.67 G2.5 2 0
154 * alf Sco s*r 16 29 24.45970 -26 25 55.2094 4.08 2.75 0.91 -0.64 -1.87 M1.5Iab+B2Vn 786 0
155 [WMR2005] 4-36 TT? 16 29 27.6173757816 -24 24 39.255727320       18.23 17.45 F8 1 0
156 * i Sco * 16 30 12.4752690460 -25 06 54.796568058 3.93 4.72 4.79 4.85 4.99 B2.5V 319 1
157 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0V 959 0

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