2013A&A...553A..48D

Query : 2013A&A...553A..48D

2013A&A...553A..48D - Astronomy and Astrophysics, volume 553A48-48 (2013/5-1)

Near-infrared variability in the star-forming region RCW 38.

DOERR M., CHINI R., HAAS M., LEMKE R. and NUERNBERGER D.

Abstract (from CDS):

We want to study the content of young stellar objects in the RCW38 cluster by means of multi-epoch variability studies. We performed a three-month near-infrared (NIR) monitoring campaign of the young cluster RCW38 using the 80cm IRIS telescope near Cerro Armazones, Chile. Variability data with a median sampling of 1 day was gathered for 1026 sources, while a total of 3433 sources in JHK could be studied in the co-added, deep images with a completeness limit of K < 15mag. We find that 139 sources were identified as variable with amplitudes above 10% in H and K, and 47% of these variables have been classified as candidate young stars by previous X-ray and mid-infrared studies. Although the majority of the variable sources show no K-excess, their high extinction and concentration towards the cluster center, together with their irregular variability behavior, suggest that they are also candidate young stellar objects. Most of them are likely low-mass sources with variability amplitudes typical of TTauri stars. The majority of previously suggested OB candidates appear to be intermediate-mass pre-main sequence sources on the basis of their JHK properties. NIR variability is an efficient tool for detecting new, embedded, young stellar objects that have escaped previous X-ray and mid-infrared studies.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be - stars: early-type - stars: late-type - open clusters and associations: individual: RCW 38

VizieR on-line data: <Available at CDS (J/A+A/553/A48): table1.dat table2.dat>

Nomenclature: Tables 1-2: [DCH2013] NNNN N=139 among (Nos 23-1652).

Simbad objects: 145

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Number of rows : 145
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 Ori A MoC 05 38 -07.1           ~ 3187 0
2 2MASS J08583268-4731186 Y*O 08 58 32.689 -47 31 18.69           ~ 3 0
3 [DCH2013] 833 V* 08 58 35.14 -47 30 16.9           ~ 1 0
4 2MASS J08584351-4729343 Y*O 08 58 43.511 -47 29 34.32           ~ 4 0
5 2MASS J08584358-4731185 Y*O 08 58 43.588 -47 31 18.57           ~ 3 0
6 2MASS J08584409-4733239 Y*O 08 58 44.092 -47 33 23.98           ~ 3 0
7 [DCH2013] 881 V* 08 58 44.35 -47 33 13.0           ~ 1 0
8 2MASS J08584464-4730345 Y*O 08 58 44.645 -47 30 34.55           ~ 2 0
9 [DCH2013] 894 V* 08 58 44.76 -47 33 36.2           ~ 1 0
10 2MASS J08584605-4729590 Y*O 08 58 46.060 -47 29 59.02           ~ 2 0
11 [DCH2013] 628 V* 08 58 46.58 -47 28 45.5           ~ 1 0
12 2MASS J08584668-4730357 Y*O 08 58 46.689 -47 30 35.73           ~ 4 0
13 2MASS J08584712-4728442 Y*O 08 58 47.1276596016 -47 28 44.204086056           ~ 4 0
14 2MASS J08584717-4731513 Y*? 08 58 47.176 -47 31 51.30           ~ 2 0
15 [DCH2013] 848 V* 08 58 47.40 -47 33 04.2           ~ 1 0
16 2MASS J08584753-4733228 Y*O 08 58 47.536 -47 33 22.88           ~ 5 0
17 [DCH2013] 1281 V* 08 58 47.58 -47 29 26.6           ~ 2 0
18 2MASS J08584797-4729409 Y*O 08 58 47.975 -47 29 40.98           ~ 3 0
19 2MASS J08584839-4729297 Y*O 08 58 48.390 -47 29 29.73           ~ 2 0
20 2MASS J08584895-4726455 Y*O 08 58 48.955 -47 26 45.57           ~ 2 0
21 [DCH2013] 689 V* 08 58 49.15 -47 30 04.5           ~ 1 0
22 2MASS J08584929-4727084 Y*O 08 58 49.293 -47 27 08.41           ~ 3 0
23 [DCH2013] 1636 V* 08 58 49.51 -47 33 19.2           ~ 1 0
24 2MASS J08584959-4732553 Y*O 08 58 49.593 -47 32 55.38           ~ 4 0
25 2MASS J08584973-4728103 Y*O 08 58 49.736 -47 28 10.35           ~ 2 0
26 [DCH2013] 764 V* 08 58 49.85 -47 31 32.5           ~ 1 0
27 [DCH2013] 873 V* 08 58 49.97 -47 34 10.7           ~ 1 0
28 [DCH2013] 1149 V* 08 58 50.52 -47 30 04.0           ~ 1 0
29 [DCH2013] 707 V* 08 58 50.78 -47 30 47.9           ~ 1 0
30 2MASS J08585082-4730129 Y*O 08 58 50.827 -47 30 12.91           ~ 3 0
31 2MASS J08585103-4727430 Y*O 08 58 51.032 -47 27 43.03           ~ 3 0
32 2MASS J08585114-4734373 Y*O 08 58 51.145 -47 34 37.35           ~ 5 0
33 [DCH2013] 1252 V* 08 58 51.34 -47 32 57.1           ~ 1 0
34 [DCH2013] 451 V* 08 58 51.6063242760 -47 26 59.733816144           ~ 1 0
35 2MASS J08585189-4730331 Y*O 08 58 51.893 -47 30 33.16           ~ 2 0
36 [DCH2013] 748 V* 08 58 52.34 -47 31 46.7           ~ 1 0
37 [DCH2013] 692 V* 08 58 52.54 -47 30 50.4           ~ 1 0
38 [DCH2013] 1121 V* 08 58 53.28 -47 33 17.0           ~ 1 0
39 2MASS J08585347-4732071 Y*O 08 58 53.479 -47 32 07.11           ~ 3 0
40 [DCH2013] 533 V* 08 58 53.76 -47 28 39.7           ~ 1 0
41 [DCH2013] 569 V* 08 58 53.88 -47 29 16.2           ~ 1 0
42 [DCH2013] 847 V* 08 58 54.22 -47 34 29.0           ~ 1 0
43 2MASS J08585446-4731597 Y*O 08 58 54.469 -47 31 59.73           ~ 4 0
44 [DCH2013] 736 V* 08 58 54.74 -47 32 06.9           ~ 1 0
45 [DCH2013] 750 V* 08 58 54.98 -47 32 22.7           ~ 1 0
46 2MASS J08585498-4728026 Y*O 08 58 54.986 -47 28 02.67           ~ 3 0
47 [DCH2013] 458 V* 08 58 55.46 -47 28 01.3           ~ 1 0
48 2MASS J08585590-4731501 Y*O 08 58 55.908 -47 31 50.14           ~ 3 0
49 [DCH2013] 746 V* 08 58 56.11 -47 32 34.2           ~ 1 0
50 2MASS J08585647-4732231 Y*O 08 58 56.475 -47 32 23.18           ~ 3 0
51 2MASS J08585693-4732055 Y*O 08 58 56.935 -47 32 05.53           ~ 2 0
52 [DCH2013] 700 V* 08 58 57.07 -47 31 58.5           ~ 1 0
53 2MASS J08585800-4731219 Y*O 08 58 58.002 -47 31 21.93           ~ 4 0
54 2MASS J08585804-4732439 Y*O 08 58 58.049 -47 32 44.00           ~ 2 0
55 2MASS J08585814-4726557 Y*O 08 58 58.140 -47 26 55.77           ~ 4 0
56 [DCH2013] 663 V* 08 58 58.473 -47 31 43.66           ~ 2 0
57 [DCH2013] 701 V* 08 58 58.5288104880 -47 32 19.372118388           ~ 1 0
58 [DCH2013] 606 V* 08 58 58.66 -47 30 45.3           ~ 1 0
59 2MASS J08585908-4728135 Y*O 08 58 59.082 -47 28 13.56           ~ 2 0
60 2MASS J08585908-4727477 Y*O 08 58 59.085 -47 27 47.78           ~ 2 0
61 2MASS J08585913-4728090 Y*O 08 58 59.1182855088 -47 28 08.946337008           ~ 4 0
62 2MASS J08585954-4729522 Y*O 08 58 59.542 -47 29 52.30           ~ 4 0
63 [DCH2013] 328 V* 08 58 59.93 -47 26 51.3           ~ 1 0
64 2MASS J08590005-4729573 Y*O 08 59 00.053 -47 29 57.39           ~ 4 0
65 2MASS J08590030-4731145 Y*O 08 59 00.308 -47 31 14.50           ~ 4 0
66 2MASS J08590039-4725591 Y*O 08 59 00.3919189296 -47 25 59.212470720           ~ 4 0
67 [DCH2013] 443 V* 08 59 00.6144183792 -47 28 45.262835400           ~ 1 0
68 [DCH2013] 485 V* 08 59 00.870 -47 29 33.47           ~ 2 0
69 2MASS J08590195-4731150 Y*O 08 59 01.9536309144 -47 31 15.152675016           ~ 4 0
70 2MASS J08590206-4732094 Y*O 08 59 02.066 -47 32 09.42           ~ 5 0
71 2MASS J08590334-4728536 Y*O 08 59 03.349 -47 28 53.60           ~ 4 0
72 [DCH2013] 320 V* 08 59 03.82 -47 27 31.9           ~ 1 0
73 2MASS J08590390-4731046 Y*O 08 59 03.902 -47 31 04.68           ~ 4 0
74 [DCH2013] 1501 V* 08 59 04.01 -47 34 22.9           ~ 1 0
75 2MASS J08590453-4725577 Y*O 08 59 04.535 -47 25 57.78           ~ 3 0
76 2MASS J08590491-4732410 Y*O 08 59 04.917 -47 32 41.09           ~ 4 0
77 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 327 2
78 [FP74] RCW 38 IRS 2 Y*O 08 59 05.6555109888 -47 30 40.941723780       14.05 11.20 O5.5V 29 1
79 [DCH2013] 917 Y*? 08 59 06.2125559376 -47 30 44.600313096           ~ 3 0
80 [DCH2013] 318 V* 08 59 06.34 -47 28 00.9           ~ 1 0
81 [DCH2013] 546 V* 08 59 06.394 -47 31 26.90           ~ 2 0
82 [DCH2013] 384 V* 08 59 06.84 -47 29 05.9           ~ 1 0
83 [DCH2013] 587 V* 08 59 06.91 -47 32 18.9           ~ 1 0
84 2MASS J08590701-4730230 Y*O 08 59 07.015 -47 30 23.07           ~ 4 0
85 [DCH2013] 428 V* 08 59 07.075 -47 29 49.55           ~ 2 0
86 2MASS J08590708-4731499 Y*O 08 59 07.086 -47 31 49.93           ~ 4 0
87 CXO J085907.5-472916 Y*O 08 59 07.458 -47 29 16.02           ~ 4 0
88 [DCH2013] 385 V* 08 59 07.75 -47 29 19.2           ~ 1 0
89 [DCH2013] 343 V* 08 59 07.92 -47 28 45.6           ~ 1 0
90 [DCH2013] 455 Y*O 08 59 07.95 -47 30 33.6           ~ 4 0
91 [DCH2013] 326 V* 08 59 08.23 -47 28 33.7           ~ 1 0
92 [DCH2013] 275 V* 08 59 08.3962958616 -47 27 40.602011688           ~ 1 0
93 [DCH2013] 929 V* 08 59 09.07 -47 30 41.1           ~ 1 0
94 2MASS J08590935-4734575 Y*O 08 59 09.358 -47 34 57.59           ~ 3 0
95 2MASS J08590971-4728453 Y*O 08 59 09.715 -47 28 45.36           ~ 4 0
96 2MASS J08590999-4729411 Y*O 08 59 09.994 -47 29 41.13           ~ 4 0
97 2MASS J08591009-4736364 Y*O 08 59 10.1000081568 -47 36 36.406704816           ~ 2 0
98 2MASS J08591045-4729427 Y*O 08 59 10.454 -47 29 42.74           ~ 4 0
99 2MASS J08591103-4727420 Y*O 08 59 11.036 -47 27 42.04           ~ 2 0
100 [DCH2013] 790 V* 08 59 12.55 -47 36 58.8           ~ 1 0
101 2MASS J08591342-4732548 Y*O 08 59 13.420 -47 32 54.85           ~ 2 0
102 2MASS J08591359-4733087 Y*O 08 59 13.594 -47 33 08.73           ~ 3 0
103 2MASS J08591400-4728564 Y*O 08 59 14.003 -47 28 56.50           ~ 4 0
104 [DCH2013] 195 V* 08 59 14.04 -47 27 13.4           ~ 1 0
105 2MASS J08591405-4732347 Y*O 08 59 14.053 -47 32 34.74           ~ 2 0
106 2MASS J08591446-4731189 Y*O 08 59 14.462 -47 31 18.94           ~ 4 0
107 2MASS J08591530-4727057 Y*O 08 59 15.302 -47 27 05.79           ~ 5 0
108 2MASS J08591548-4732168 Y*O 08 59 15.4735526736 -47 32 16.863729144           ~ 2 0
109 2MASS J08591630-4728416 Y*O 08 59 16.309 -47 28 41.65           ~ 3 0
110 2MASS J08591640-4728258 Y*O 08 59 16.400 -47 28 25.85           ~ 2 0
111 CXO J085916.9-472748 Y*O 08 59 16.856 -47 27 48.91           ~ 5 0
112 2MASS J08591725-4730110 Y*O 08 59 17.253 -47 30 11.07           ~ 4 0
113 [DCH2013] 990 V* 08 59 17.28 -47 35 33.5           ~ 1 0
114 2MASS J08591759-4729026 Y*O 08 59 17.591 -47 29 02.68           ~ 2 0
115 [DCH2013] 52 V* 08 59 17.88 -47 24 52.9           ~ 1 0
116 2MASS J08591821-4728544 Y*O 08 59 18.213 -47 28 54.43           ~ 4 0
117 2MASS J08591950-4726013 Y*O 08 59 19.500 -47 26 01.35           ~ 3 0
118 2MASS J08591963-4730596 Y*O 08 59 19.636 -47 30 59.62           ~ 2 0
119 2MASS J08591983-4727311 Y*O 08 59 19.832 -47 27 31.19           ~ 3 0
120 2MASS J08592029-4731061 Y*O 08 59 20.294 -47 31 06.11           ~ 5 0
121 2MASS J08592091-4731193 Y*O 08 59 20.920 -47 31 19.32           ~ 4 0
122 [DCH2013] 603 V* 08 59 21.70 -47 35 40.6           ~ 1 0
123 2MASS J08592251-4729040 Y*O 08 59 22.513 -47 29 04.07           ~ 2 0
124 2MASS J08592294-4726413 Y*O 08 59 22.941 -47 26 41.34           ~ 3 0
125 2MASS J08592388-4728403 Y*O 08 59 23.882 -47 28 40.36           ~ 2 0
126 2MASS J08592435-4730443 Y*O 08 59 24.352 -47 30 44.34           ~ 4 0
127 2MASS J08592440-4726576 Y*O 08 59 24.406 -47 26 57.64           ~ 3 0
128 [DCH2013] 236 V* 08 59 26.54 -47 30 45.0           ~ 1 0
129 2MASS J08592679-4732525 Y*O 08 59 26.797 -47 32 52.56           ~ 2 0
130 2MASS J08592701-4733508 Y*O 08 59 27.011 -47 33 50.81           ~ 2 0
131 2MASS J08592784-4728030 Y*O 08 59 27.8316631368 -47 28 03.061001316           ~ 4 0
132 [DCH2013] 1285 V* 08 59 27.84 -47 34 54.7           ~ 1 0
133 [DCH2013] 1611 V* 08 59 28.68 -47 27 39.2           ~ 1 0
134 2MASS J08592872-4729247 Y*O 08 59 28.728 -47 29 24.77           ~ 2 0
135 2MASS J08593000-4726338 Y*O 08 59 30.0005636832 -47 26 33.860328252           ~ 4 0
136 [DCH2013] 106 V* 08 59 31.01 -47 28 46.2           ~ 1 0
137 2MASS J08593211-4729249 Y*O 08 59 32.112 -47 29 24.95           ~ 2 0
138 2MASS J08593332-4732536 Y*O 08 59 33.3087837480 -47 32 53.686384764           ~ 4 0
139 [DCH2013] 273 V* 08 59 36.43 -47 33 28.7           ~ 1 0
140 2MASS J08593770-4733574 Y*O 08 59 37.7021796696 -47 33 57.498207192           ~ 3 0
141 [DCH2013] 1360 V* 08 59 39.58 -47 29 37.7           ~ 1 0
142 2MASS J08594024-4730276 Y*O 08 59 40.2367472736 -47 30 27.642362148           ~ 4 0
143 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
144 LDN 1003 DNe 20 59 32 +52 21.7           ~ 26 0
145 Ass Cyg OB 7 As* 21 08 +47.6           ~ 218 0

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