2008A&A...485..155A

Query : 2008A&A...485..155A

2008A&A...485..155A - Astronomy and Astrophysics, volume 485, 155-166 (2008/7-1)

Deep near-IR variability survey of pre-main-sequence stars in ρ Ophiuchi.

ALVES DE OLIVEIRA C. and CASALI M.

Abstract (from CDS):

Variability is a common characteristic of pre-main-sequence stars (PMS). Near-IR variability surveys of young stellar objects (YSOs) can probe stellar and circumstellar environments and provide information about the dynamics of the ongoing magnetic and accretion processes. Furthermore, variability can be used as a tool to uncover new cluster members in star formation regions. We hope to achieve the deepest near-IR variability study of YSOs targeting the ρ Ophiuchi cluster. Fourteen epochs of observations were obtained with the Wide Field Camera (WFCAM) at the UKIRT telescope scheduled in a manner that allowed the study of variability on timescales of days, months, and years. Statistical tools, such as the multi-band cross correlation index and the reduced chi-square, were used to disentangle signals of variability from noise. Variability characteristics are compared to existing models of YSOs in order to relate them to physical processes, and then used to select new candidate members of this star-forming region. Variability in the near-IR is found to be present in 41% of the known population of ρ Ophiuchi recovered in our sample. The behaviours shown are several and can be associated with the existence of spots on the stellar surface, variations in circumstellar extinction, or changes in the geometry of an accretion disc. Using variability, a new population of objects has been uncovered that is believed to be part of the ρ Ophiuchi cluster.

Abstract Copyright: ∼

Journal keyword(s): stars: pre-main-sequence - stars: low-mass, brown dwarfs - stars: activity - stars: variables: general

VizieR on-line data: <Available at CDS (J/A+A/485/155): table4.dat tablea1.dat>

Nomenclature: Tables 4, a1: AOC JHHMMSS.ss+DDMMSS.s N=137+39.

Simbad objects: 182

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Number of rows : 182
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4417 0
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2332 0
3 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1619 1
4 NAME Cha II MoC 12 54 -77.2           ~ 337 0
5 AOC J162554.64-244112.8 LM? 16 25 54.64 -24 41 12.8           ~ 1 0
6 2MASS J16255568-2405496 Y*? 16 25 55.6937071704 -24 05 49.748832600           ~ 1 0
7 AOC J162556.76-243001.1 LM? 16 25 56.76 -24 30 01.1           ~ 1 0
8 2MASS J16255830-2417552 Y*? 16 25 58.30 -24 17 55.2           ~ 1 0
9 2MASS J16260017-2404274 Y*? 16 26 00.1795480656 -24 04 27.439222836           ~ 1 0
10 [SKS95] 162300.0-241834 Y*O 16 26 01.3781005104 -24 25 20.496413424           ~ 23 0
11 BKLT J162607-242725 Y*O 16 26 07.04280 -24 27 24.1848           ~ 22 1
12 BKLT J162607-242742 Y*O 16 26 07.63968 -24 27 41.3676           ~ 18 1
13 BKLT J162610-243353 Y*O 16 26 09.9350881632 -24 33 54.126883332           ~ 13 0
14 AOC J162609.95-240046.7 LM? 16 26 09.95 -24 00 46.7           ~ 1 0
15 AOC J162611.05-241208.8 LM? 16 26 11.05 -24 12 08.8           ~ 1 0
16 AOC J162612.86-241244.1 LM? 16 26 12.86 -24 12 44.1           ~ 1 0
17 BKLT J162615-244112 * 16 26 15.01968 -24 41 14.8344           ~ 2 0
18 BKLT J162618-243033 Y*O 16 26 18.13704 -24 30 33.0408           ~ 17 0
19 BKLT J162618-242951 LM* 16 26 18.58104 -24 29 51.4860           M6.75 19 0
20 CRBR 2317.5-1729 Y*O 16 26 18.98232 -24 24 14.2596           M6 47 0
21 2MASS J16261909-2403485 Y*? 16 26 19.1145584208 -24 03 48.493575792           ~ 5 0
22 AOC J162619.42-243233.8 LM? 16 26 19.42 -24 32 33.8           ~ 1 0
23 BKLT J162620-242840 Y*O 16 26 20.83872 -24 28 39.5724           ~ 16 0
24 AOC J162621.54-241242.5 LM? 16 26 21.54 -24 12 42.5           ~ 1 0
25 [RR90] Oph 2320.8-1721 Y*O 16 26 22.26912 -24 24 07.0632           M8 70 0
26 [AMD2002] J162623-242353 Y*O 16 26 23.33352 -24 23 51.5040           ~ 3 0
27 CRBR 2322.3-1143 Y*O 16 26 23.81424 -24 18 29.0016           M6.7 26 0
28 AOC J162624.29-241549.7 BD? 16 26 24.29352 -24 15 49.7808           ~ 5 0
29 AOC J162624.41-244345.5 Y*? 16 26 24.41 -24 43 45.5           ~ 1 0
30 BKLT J162625-241108 * 16 26 26.0952639216 -24 11 06.346174344           ~ 2 0
31 AOC J162631.14-241208.5 LM? 16 26 31.14 -24 12 08.5           ~ 1 0
32 [SKS95] 162334.7-241415 Y*O 16 26 35.96088 -24 20 58.7328           ~ 8 0
33 [GY92] 76 Y*? 16 26 36.07656 -24 24 04.1580           ~ 6 0
34 V* V2675 Oph Or* 16 26 36.8195427312 -24 19 00.220560852           M3.25 22 1
35 2MASS J16263741-2408422 Y*? 16 26 37.4289082968 -24 08 42.139323888       17.8 16.01 K2-K4 2 0
36 VSSG 4 Y*O 16 26 37.78680 -24 23 00.7476           ~ 32 0
37 AOC J162638.66-244144.4 Y*? 16 26 38.66 -24 41 44.4           ~ 1 0
38 [GY92] 84 Y*O 16 26 38.80368 -24 23 22.7328           M6 22 0
39 [GY92] 90 Y*O 16 26 39.91704 -24 22 33.4272           M8.25 18 0
40 WL 7 Y*O 16 26 42.14328 -24 31 02.9460           ~ 35 0
41 [GY92] 103 Y*O 16 26 42.52440 -24 26 31.9056           ~ 10 1
42 [GY92] 109 Y*O 16 26 42.89280 -24 22 59.0808           M6 19 0
43 AOC J162643.90-240357.8 Y*? 16 26 43.90 -24 03 57.8           ~ 1 0
44 BKLT J162646-241910 Y*O 16 26 46.7659098504 -24 19 08.825351736           ~ 6 1
45 [GY92] 122 Y*O 16 26 47.0562943152 -24 44 29.784385248       17.41 15.19 M4.5 25 0
46 AOC J162647.88-240946.8 LM? 16 26 47.88 -24 09 46.8           ~ 1 0
47 BBRCG 6 Y*O 16 26 48.39672 -24 28 34.8852           ~ 10 1
48 WL 2 Y*O 16 26 48.48624 -24 28 38.9064           ~ 60 1
49 BKLT J162648-241230 Y*O 16 26 48.5435220000 -24 12 27.304531380           ~ 3 0
50 BKLT J162650-241354 Y*O 16 26 50.4909558576 -24 13 52.248199008       16.82 14.78 M4.5 19 0
51 AOC J162651.52-241855.1 Y*? 16 26 51.52 -24 18 55.1           ~ 1 0
52 BBRCG 13 Y*O 16 26 51.97104 -24 30 39.4956           M4-M6 30 1
53 BBRCG 14 Y*O 16 26 53.46936 -24 32 36.2472           ~ 27 1
54 [GY92] 154 Y*O 16 26 54.77088 -24 27 02.2464           M6 27 0
55 [GY92] 156 Y*O 16 26 54.97272 -24 22 29.6904           ~ 22 1
56 BKLT J162656-241020 * 16 26 56.26944 -24 10 17.7528           ~ 2 0
57 YLW 1C Or* 16 26 58.39608 -24 21 29.9808           M6 35 0
58 BKLT J162658-241836 Or* 16 26 58.63896 -24 18 34.6644           M4.5 25 1
59 2MASS J16265867-2424555 Y*O 16 26 58.67448 -24 24 55.5768           M4-7 12 0
60 WL 14 Or* 16 26 59.04984 -24 35 56.8788           ~ 53 0
61 AOC J162700.96-241230.6 LM? 16 27 00.96 -24 12 30.6           ~ 1 0
62 [GY92] 188 Y*O 16 27 03.00720 -24 26 14.6976           ~ 29 1
63 BKLT J162703-242007 Y*O 16 27 03.59088 -24 20 05.4456           M1.5 23 0
64 VSSG 31 Or* 16 27 04.10688 -24 28 29.9136           ~ 61 1
65 [GY92] 195 Or* 16 27 04.57464 -24 27 15.6636           ~ 33 1
66 [GY92] 196 V* 16 27 05.0378092872 -24 44 22.978709484           ~ 4 0
67 AOC J162705.45-240519.9 LM? 16 27 05.45 -24 05 19.9           ~ 1 0
68 BKLT J162705-244013 Y*O 16 27 05.67576 -24 40 13.0908           ~ 18 0
69 [GY92] 204 TT* 16 27 06.5924837856 -24 41 48.871282992       17.57 15.43 M5 99 0
70 WL 17 Y*O 16 27 06.77616 -24 38 14.9964           ~ 102 0
71 [GY92] 206 * 16 27 07.03224 -24 43 38.9064           ~ 3 0
72 [GY92] 213 Y*O 16 27 09.35328 -24 40 22.4292           ~ 32 0
73 BBRCG 26 Or* 16 27 10.03536 -24 29 13.3008           ~ 24 0
74 WLY 1-43 Y*O 16 27 11.17992 -24 40 46.6680           ~ 60 0
75 WL 19 Y*O 16 27 11.71416 -24 38 32.0604           ~ 71 0
76 WL 11 Or* 16 27 12.13128 -24 34 49.1412           M2 45 0
77 [RR90] Oph 2412.9-2447 Y*O 16 27 14.34048 -24 31 31.9260           M7.75 12 0
78 WLY 2-33 Y*O 16 27 14.50512 -24 26 46.0860           ~ 34 0
79 2MASS J16271462-2423130 Y*? 16 27 14.62 -24 23 13.0           ~ 1 0
80 YLW 10B Y*O 16 27 15.45432 -24 26 39.8004           ~ 51 0
81 WLY 2-35 Y*O 16 27 15.51408 -24 30 53.6832           ~ 33 0
82 YLW 10C Y*O 16 27 15.88488 -24 25 14.1924           ~ 29 0
83 2MASS J16271720-2435130 Y*? 16 27 17.20 -24 35 13.0           ~ 3 0
84 [GY92] 248 Y*? 16 27 18.37560 -24 24 26.3124           ~ 12 0
85 BBRCG 39 Y*O 16 27 18.38040 -24 39 14.6844           ~ 41 0
86 WL 6 Y*O 16 27 21.80448 -24 29 53.3616           ~ 115 0
87 [GY92] 253 Y*O 16 27 21.83064 -24 43 35.6952           M3 29 0
88 [GY92] 259 Y*O 16 27 24.63624 -24 29 35.3976           ~ 26 0
89 BKLT J162726-241925 Y*O 16 27 26.22336 -24 19 22.9980           M7.75 30 0
90 [GY92] 264 TT* 16 27 26.5812811008 -24 25 54.395321448       17.90 15.72 M8 47 0
91 BBRCG 46 Y*O 16 27 27.06864 -24 32 17.5200           ~ 17 0
92 AOC J162732.05-241956.3 Y*? 16 27 32.05 -24 19 56.3           ~ 2 0
93 BBRCG 59 Y*O 16 27 32.71056 -24 32 42.3636           ~ 13 0
94 BBRCG 61 Y*O 16 27 32.85048 -24 32 34.8324           ~ 33 0
95 AOC J162733.75-242234.9 Y*? 16 27 33.76608 -24 22 34.9824           ~ 6 0
96 BKLT J162735-240921 Y*? 16 27 35.57808 -24 09 18.7380           ~ 2 0
97 2MASS J16273615-2404576 LM* 16 27 36.1530517200 -24 04 57.646787736           M6 10 0
98 [GY92] 301 Y*O 16 27 37.24944 -24 42 38.0160           ~ 37 0
99 [GY92] 309 Y*? 16 27 38.05752 -24 25 27.9372           ~ 6 0
100 [GY92] 312 Y*O 16 27 38.94456 -24 40 20.6724           M2.5 45 0
101 BKLT J162739-243850 * 16 27 39.87888 -24 38 51.2844           ~ 3 0
102 BKLT J162740-240929 * 16 27 40.28544 -24 09 27.1980           ~ 2 0
103 BKLT J162741-244645 Y*O 16 27 41.61024 -24 46 44.7420           ~ 21 0
104 [GY92] 323 Y*O 16 27 41.75280 -24 43 36.0984           ~ 23 0
105 2MASS J16274499-2406284 Y*O 16 27 44.9906270256 -24 06 28.487247192           M2-4 10 0
106 [GY92] 352 Y*O 16 27 47.09496 -24 45 35.0676           ~ 24 0
107 AOC J162748.11-240155.9 Y*? 16 27 48.11 -24 01 55.9           ~ 1 0
108 2MASS J16274825-2442256 BD? 16 27 48.25 -24 42 25.6           ~ 14 0
109 AOC J162749.40-242919.3 LM? 16 27 49.40 -24 29 19.3           ~ 1 0
110 2MASS J16274945-2404224 Y*? 16 27 49.4591955792 -24 04 22.415319156           ~ 1 0
111 AOC J162749.80-243950.1 LM? 16 27 49.80 -24 39 50.1           ~ 1 0
112 AOC J162750.41-244042.7 LM? 16 27 50.41 -24 40 42.7           ~ 1 0
113 [GY92] 377 Y*O 16 27 51.8954041800 -24 46 30.021158712           ~ 14 0
114 AOC J162800.15-241222.8 LM? 16 28 00.15 -24 12 22.8           ~ 1 0
115 2MASS J16280020-2406531 Y*? 16 28 00.2080279680 -24 06 53.215212456           ~ 1 0
116 AOC J162801.81-241305.0 LM? 16 28 01.81 -24 13 05.0           ~ 1 0
117 2MASS J16280209-2408452 Y*? 16 28 02.10 -24 08 45.2           ~ 1 0
118 2MASS J16280320-2405372 LM? 16 28 03.2107813320 -24 05 36.874727052           ~ 1 0
119 [GY92] 461 Y*? 16 28 04.55160 -24 34 48.4536           ~ 9 0
120 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
121 BKLT J162811-242920 * 16 28 11.0885753928 -24 29 19.829654664       17.14 15.44 G9-K0 10 0
122 AOC J162811.46-241458.7 V* 16 28 11.46 -24 14 58.7           ~ 1 0
123 BKLT J162812-241138 Y*O 16 28 12.7235398560 -24 11 35.716712676           M6 34 0
124 AOC J162814.41-244546.2 LM? 16 28 14.41 -24 45 46.2           ~ 1 0
125 BKLT J162814-242846 * 16 28 14.7250726032 -24 28 46.642463976           ~ 2 0
126 BKLT J162814-242324 LP? 16 28 14.7669448632 -24 23 22.653393360       17.03 15.32 G9-K2 12 0
127 [WMR2005] 4-58 Y*? 16 28 16.5622153944 -24 07 36.607734768       18.46 16.77 K6-M1 3 0
128 BKLT J162817-241706 Y*O 16 28 17.7432826872 -24 17 05.145877680           M5 11 0
129 AOC J162818.95-241319.1 LM? 16 28 18.95 -24 13 19.1           ~ 1 0
130 BKLT J162819-240908 * 16 28 19.8333170952 -24 09 06.418238256           ~ 2 0
131 AOC J162821.73-241711.3 Y*? 16 28 21.73 -24 17 11.3           ~ 1 0
132 AOC J162822.10-241229.6 Y*? 16 28 22.10 -24 12 29.6           ~ 1 0
133 BKLT J162824-242146 * 16 28 24.3973791552 -24 21 45.463873968           ~ 3 0
134 BKLT J162838-242637 * 16 28 38.3527698504 -24 26 37.100371020           ~ 8 0
135 AOC J162840.66-243148.3 LM? 16 28 40.66 -24 31 48.3           ~ 1 0
136 BKLT J162841-243323 * 16 28 41.5468972488 -24 33 23.892847956           ~ 8 0
137 AOC J162841.89-242705.6 LM? 16 28 41.89 -24 27 05.6           ~ 1 0
138 AOC J162844.20-240115.1 LM? 16 28 44.20 -24 01 15.1           ~ 1 0
139 2MASS J16284430-2447248 Y*? 16 28 44.30352 -24 47 24.8676           ~ 1 0
140 2MASS J16284589-2408358 Y*? 16 28 45.9021886056 -24 08 35.863741932           ~ 1 0
141 SSTc2d J162846.9-240213 LM? 16 28 46.90 -24 02 12.9           ~ 1 0
142 BKLT J162847-242814 LM* 16 28 47.0407068024 -24 28 13.794525444       18.05 16.00 M6 21 0
143 BKLT J162847-242338 * 16 28 47.4012714528 -24 23 37.330157688           ~ 2 0
144 BKLT J162847-242536 * 16 28 47.6314123656 -24 25 36.364350828           ~ 2 0
145 BKLT J162848-243149 RR* 16 28 48.7147147080 -24 31 50.125695564           ~ 3 0
146 BKLT J162850-243518 Y*O 16 28 49.99680 -24 35 18.1212           ~ 3 0
147 BKLT J162850-242833 * 16 28 50.8573092912 -24 28 32.381855580           ~ 2 0
148 AOC J162852.34-242849.1 LM? 16 28 52.34 -24 28 49.1           ~ 1 0
149 BKLT J162852-240930 Y*? 16 28 52.74000 -24 09 26.2764           ~ 2 0
150 AOC J162855.25-244515.6 Y*? 16 28 55.25 -24 45 15.6           ~ 1 0
151 AOC J162856.53-244458.3 Y*? 16 28 56.53 -24 44 58.3           ~ 1 0
152 BKLT J162857-243809 V* 16 28 56.8016113632 -24 38 10.150093896       17.09 15.44 K3-K6 10 0
153 BKLT J162857-243109 Y*O 16 28 56.9520314328 -24 31 09.677787564       17.47 15.39 M5-M6 18 0
154 BKLT J162857-242805 * 16 28 57.8082896352 -24 28 04.625418756           ~ 7 0
155 AOC J162858.30-243544.2 LM? 16 28 58.30 -24 35 44.2           ~ 1 0
156 AOC J162902.71-242837.7 LM? 16 29 02.71 -24 28 37.7           ~ 1 0
157 BKLT J162904-242126 * 16 29 04.31064 -24 21 25.6968           ~ 2 0
158 AOC J162905.65-242314.9 LM? 16 29 05.65 -24 23 14.9           ~ 1 0
159 AOC J162911.02-242240.0 LM? 16 29 11.02 -24 22 40.0           ~ 1 0
160 2MASS J16291184-2439559 Y*? 16 29 11.85 -24 39 55.9           ~ 1 0
161 AOC J162915.63-240958.5 Y*? 16 29 15.63 -24 09 58.5           ~ 1 0
162 BKLT J162916-243843 * 16 29 16.3294024680 -24 38 44.057863752           ~ 2 0
163 AOC J162919.04-241038.8 LM? 16 29 19.04 -24 10 38.8           ~ 1 0
164 2MASS J16291996-2409263 Y*? 16 29 19.9800783720 -24 09 26.362311732           ~ 1 0
165 AOC J162920.93-241936.8 LM? 16 29 20.9311139808 -24 19 36.888653136           ~ 1 0
166 2MASS J16292328-2409148 Y*? 16 29 23.2911993192 -24 09 14.873225148           ~ 1 0
167 2MASS J16292456-2403325 RR* 16 29 24.5866233192 -24 03 32.565279060           ~ 3 0
168 AOC J162927.18-241020.0 Y*? 16 29 27.18 -24 10 20.0           ~ 1 0
169 AOC J162929.44-243426.3 LM? 16 29 29.44 -24 34 26.3           ~ 1 0
170 2MASS J16293030-2441389 Y*? 16 29 30.3126442104 -24 41 39.017154120           ~ 1 0
171 AOC J162930.59-241907.8 LM? 16 29 30.59 -24 19 07.8           ~ 1 0
172 2MASS J16293102-2433003 Y*? 16 29 31.0224419640 -24 33 00.177751836           ~ 1 0
173 2MASS J16293279-2433059 Y*? 16 29 32.8044513504 -24 33 05.902360776           ~ 3 0
174 AOC J162933.26-243359.0 LM? 16 29 33.26 -24 33 59.0           ~ 1 0
175 AOC J162937.02-243035.2 LM? 16 29 37.02 -24 30 35.2           ~ 1 0
176 2MASS J16293724-2434269 Y*? 16 29 37.2438423072 -24 34 26.835822840           ~ 1 0
177 SSTc2d J162938.1-243618 Y*? 16 29 38.15 -24 36 18.4           ~ 1 0
178 AOC J162939.40-242309.4 LM? 16 29 39.40 -24 23 09.4           ~ 1 0
179 AOC J162943.28-243056.4 LM? 16 29 43.28 -24 30 56.4           ~ 1 0
180 AOC J162943.49-243102.7 LM? 16 29 43.49 -24 31 02.7           ~ 1 0
181 AOC J162945.00-243421.7 LM? 16 29 45.00 -24 34 21.7           ~ 1 0
182 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1100 2

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