1996A&AS..119....7A

Query : 1996A&AS..119....7A

1996A&AS..119....7A - Astron. Astrophys., Suppl. Ser., 119, 7-24 (1996/October-1)

New weak-line T Tauri stars in Orion from the ROSAT all-sky survey.

ALCALA J.M., TERRANEGRA L., WICHMANN R., CHAVARRIA-K. C., KRAUTTER J., SCHMITT J.H.M.M., MORENO-CORRAL M.A., DE LARA E. and WAGNER R.M.

Abstract (from CDS):

We present results of the spectroscopic and photometric follow-up observations of the ROSAT all-sky survey in the direction of the Orion cloud complex. The main goal of these observations is the search for X-ray emitting pre-main sequence stars. 820 X-ray sources were detected with high confidence in about 450 square degrees. The mean density of X-ray sources in this region is a factor of about two higher than that of the whole RASS. 5% of the RASS sources in this region are identified with previously known and likely pre-main sequence stars. We have investigated spectroscopically 181 new RASS sources widely distributed over the entire cloud complex. On the basis of the presence of strong Li I λ6707 absorption, spectral type later than F0 and chromospheric emission, 112 new weak-line T Tauri stars could be found. We present coordinates, X-ray count-rates and finding charts of the new PMS. Optical UBV(RI)KC, near-infrared JHKLM and uvby-β photometry for the new WTTS is also provided. In addition 24 dKe-dMe stars were also found on the basis of the RASS data.

Abstract Copyright: ∼

Journal keyword(s): X-rays: stars - stars: pre-main-sequence - ISM: Orion star forming region

Nomenclature: Table 3: [ATW96] RX JHHMM.m+DDMMa N=4

Simbad objects: 164

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Number of rows : 164
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 RX J0500.4-1054 TT* 05 00 26.8 -10 54 47   14.11 13.00     K6 3 0
2 RX J0501.1+0642 TT* 05 01 04.247232 +06 42 20.03328   13.64 12.60 12.42   K5e 7 0
3 2MASS J05022084-0744099 TT* 05 02 20.8460227728 -07 44 09.993564276   11.94 11.30     G7 13 0
4 V* AX Lep TT* 05 03 49.5558360864 -11 31 01.143472368     12.26     K3 8 0
5 RX J0506.2+0439 TT* 05 06 12.9262848888 +04 39 27.184049496   14.98 13.46 13.03 10.410 M4.5V 60 0
6 V* AQ Eri CV* 05 06 13.1058945528 -04 08 07.253107476           ~ 89 0
7 RX J0507.5+1010 TT* 05 07 31.1494072968 +10 10 36.847751412   11.25 10.485   9.621 K2 14 0
8 V* MS Eri Or* 05 07 48.3256605504 -09 31 43.260275316     12.50     K2 11 0
9 V* V1849 Ori TT* 05 09 00.6610859928 -03 15 06.679606896 12.26 12.09 11.39   10.51 G8 17 0
10 2MASS J05100460-0428037 TT* 05 10 04.5964274304 -04 28 03.656210736 13.36 12.65 11.73   10.41 K4 12 0
11 2MASS J05101478-0330074 TT* 05 10 14.7718055712 -03 30 07.353718632   12.53 11.74 11.29 10.87 G8 16 0
12 V* V1850 Ori TT* 05 11 38.9321631144 -03 48 47.070254232 13.13 12.77 12.02   11.01 K1 17 0
13 V* AM Lep BY* 05 12 17.5857875088 -11 51 58.031870004     9.92   9.32 G8Ve 20 0
14 V* V531 Ori Or* 05 12 20.5314421032 -02 55 52.459617072 14.10 13.56 12.61 12.05 11.49 K2 18 0
15 V* V1852 Ori TT* 05 13 05.8198772664 +08 51 31.405839588     12.59 11.88   K2+M2 11 0
16 RX J0513.4-1244 TT* 05 13 22.0297780344 -12 44 52.401060312   11.48 10.689   9.982 G6 11 0
17 BD-09 1108 V* 05 15 36.5214279048 -09 30 51.369155136   10.45 9.825   8.975 G5 30 0
18 V* V1855 Ori TT* 05 17 54.4112840016 -07 08 19.373753148   11.64 10.695   9.714 K2e 32 0
19 RX J0518.0-1146 TT* 05 17 57.3928262856 -11 46 04.373938020   12.468 11.448 11.251 10.398 K3 16 0
20 V* V1856 Ori RS* 05 18 02.1713190912 +07 12 39.643925472     13.08     K3 9 0
21 RX J0518.3+0829 TT* 05 18 19.9466539320 +08 29 13.281632952   12.05 11.304   10.223 G9 11 0
22 V* V1857 Ori Ir* 05 18 38.2644046276 +09 59 15.806886324   13.505 12.623 12.341   K2(e) 9 0
23 RX J0519.9+0552 TT* 05 19 50.86 +05 52 14.9     14.72     K6 7 0
24 RX J0520.0+0612 TT* 05 20 00.2963262960 +06 13 03.693634140   12.84 11.581   10.200 K4e 32 0
25 EM* StHA 39 TT* 05 20 31.4286972864 -05 48 24.468692724   12.816 11.754 11.086 10.518 ~ 9 1
26 RX J0520.5+0616 TT* 05 20 31.8237082536 +06 16 11.577800640   12.66 11.677   10.279 K3e 35 0
27 RX J0520.9-0452 TT* 05 20 56.0 -04 52 43   9.98 9.53     F5 5 0
28 RX J0522.1-0844 TT* 05 22 03.4 -08 44 19           K1 4 0
29 2MASS J05224314+0014330 TT* 05 22 43.1435276304 +00 14 33.052290540     15.73     M2e 4 0
30 2MASS J05224831-1144391 TT* 05 22 48.3113291304 -11 44 39.262605864     14.74     M1e 5 0
31 RX J0522.9+0857 TT* 05 22 54.7927274928 +08 58 04.679488200   11.28 10.33 9.75 9.080 K1 18 1
32 RX J0523.0-0850 TT* 05 22 57.0591627713 -08 50 12.041117253     13.824   11.601 M2 10 0
33 Kiso A-0975 69 TT* 05 23 03.8191750536 -04 40 43.797790272   15.68 14.43 14.08   K6e 13 0
34 RX J0523.7+0652 TT* 05 23 42.4636988640 +06 51 58.295634048   13.87 12.806   11.018 K6e 19 0
35 2MASS J05240769+0730554 TT* 05 24 07.6973295000 +07 30 55.475721144     12.72     K4 6 0
36 RX J0523.3+0208 TT* 05 25 15.9 +02 08 56     15.77     ~ 3 0
37 2MASS J05263126+1510151 TT* 05 26 31.2665733888 +15 10 15.134352312   12.19 11.71     G5 10 0
38 2MASS J05264348+0143538 TT* 05 26 43.4866715208 +01 43 53.762228076     12.83     K0 30 0
39 RX J0526.8+0222 TT* 05 26 48.1958136648 +02 22 02.551697328   12.00 11.441   10.670 G5 30 0
40 2MASS J05274134+0153269 TT* 05 27 41.3564328360 +01 53 26.892720060     16.02     K7 3 0
41 RX J0527.7+1446 ** 05 27 43.140720 +14 46 12.08424   15.66 14.13 13.91   M3 6 0
42 V* V1869 Ori RS* 05 27 58.9593041880 -00 53 15.146651796     12.72     K0 20 0
43 2MASS J05281582+0326484 TT* 05 28 15.8262266333 +03 26 48.358467226   12.66 11.76     K0 24 0
44 RX J0528.8+0105 TT* 05 28 46 +09 59.6     12.67     K4 4 0
45 V* V1870 Ori RS* 05 28 46.8337714056 +00 48 40.688538876     14.04     K0 22 0
46 RX J0528.8+1121 Em* 05 28 48.504 +11 20 57.96           ~ 2 0
47 V* V1159 Ori CV* 05 28 59.5676204544 -03 33 52.282939068   14.321 14.203 15.317   ~ 152 0
48 RX J0529.2-0615 TT* 05 29 13.3004412912 -06 15 14.985238824   11.92 11.166   10.209 K1 13 0
49 V* V1642 Ori TT* 05 29 20.633592 +00 41 27.99600   13.31 12.31 12.03   K2(e) 44 0
50 V* V649 Ori Or* 05 29 23.939664 +11 51 57.51504   13.20 12.08 11.81 10.592 G8III/Ve 47 1
51 V* V1876 Ori RS* 05 30 05.1821955408 +00 41 20.307009516   10.13 9.574   8.781 G0 16 0
52 RX J0530.3-1308 Ro* 05 30 19.6125602136 -13 08 02.520938832   12.09 10.951   9.880 K 7 0
53 V* V1878 Ori Or* 05 30 42.6347292144 -04 35 01.901663412   12.60 11.521   10.221 K3e 36 0
54 HD 36263 ** 05 30 51.7659921 +10 15 15.773076           B7II-III 43 0
55 RX J0531.2+0118 TT* 05 31 09.6 +01 18 52   13.68 12.84     K0 5 0
56 HD 294207 TT* 05 31 38.59152 -03 27 06.9084     9.56     K0 13 0
57 V* V1882 Ori SB* 05 32 02.2843553976 -07 31 55.693377192     12.57 12.41   K4 16 0
58 BD-13 1177 TT* 05 32 14.2552473432 -13 41 08.201525784   10.218 9.627   9.025 F5 8 0
59 V* V1883 Ori TT* 05 32 21.9478501373 +01 31 41.316358386           K5 6 0
60 V* V1884 Ori TT* 05 32 22.5610093608 +01 31 42.457889352   12.600 11.856 11.647   K2 14 0
61 RX J0532.4-0713 TT* 05 32 24.6 -07 13 12   13.97 12.86     K3 4 0
62 V* V1885 Ori Or* 05 32 30.811776 -04 21 36.45900   12.94 11.89 11.65   K4 12 0
63 V* HR Ori Or* 05 32 36.1182223080 -05 23 00.948103008   13.19 12.072   10.79506 K7 22 1
64 V* V1886 Ori TT* 05 33 04.8760436472 -07 58 48.623760948     11.897   10.746 K3 10 0
65 V* V1887 Ori TT* 05 33 08.8694984448 +02 24 43.790429088     13.49     K4 13 0
66 Kiso A-0904 14 Em* 05 33 14.0041370928 -01 31 01.685179344     14.9     ~ 2 0
67 Parenago 1210 TT* 05 33 29.9856947736 -06 45 53.962765452   11.67 11.10     G8 10 0
68 V* V730 Ori TT* 05 33 44.7225964056 -05 21 03.964997880   14.88 13.79 13.54   F9V: 26 0
69 V* V371 Ori PM* 05 33 44.8000263360 +01 56 43.452872340 13.956 12.51 11.499 10.382 9.072 M3.0Ve 171 0
70 RX J0534.0-0221 PM* 05 33 59.8219468272 -02 21 32.384682504   13.91 12.42 12.04 9.897 M3 44 0
71 HD 245059 Or* 05 34 34.9054781133 +10 07 06.336248351   10.71 9.926   8.865 G8e 53 0
72 V* V938 Ori TT* 05 34 38.7412693968 -06 06 19.336142664   15.66 14.42 14.03 12.81 K3e 26 0
73 Brun 334 Or* 05 34 39.7638260448 -05 24 25.590693312 14.065 12.535 11.606   9.794 K3V+K5V 92 0
74 RX J0534.7-0423 TT* 05 34 40.5 -04 23 35   11.53 11.06     K2 5 0
75 2MASS J05344376+1114583 TT* 05 34 43.7607860544 +11 14 58.177328568     12.41     K4 6 0
76 V* V1118 Ori TT* 05 34 44.7401295035 -05 33 42.119715628 15.053 15.378 14.430 15.22 12.701 M1e 153 0
77 V* KK Ori Or* 05 34 48.1596216576 -05 42 29.035051884 17.530 16.316 15.145   12.659 ~ 33 0
78 V* V776 Ori Or* 05 34 50.9682855000 -05 42 21.477787128 14.483 13.561 12.813   11.456 K0 41 0
79 V* V2119 Ori Or* 05 35 02.0475162891 -04 12 00.942504571   12.9 12.02     K1 25 0
80 V* V1321 Ori Or* 05 35 04.3009445808 -05 08 12.737523192   11.94 10.538   9.117 K0III 103 0
81 2MASS J05351569-0059286 TT* 05 35 15.6958020432 -00 59 28.672962576   15.10 14.06     K3 17 0
82 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
83 Haro 5-72 Or* 05 35 20.1707293800 -00 42 13.776448968     13.858   12.440 ~ 25 0
84 V* V796 Ori Or* 05 35 21.3140707440 -06 56 24.395132508     17.758   14.93981 M2.8 17 0
85 V* MW Ori TT* 05 35 21.5132246424 -04 50 45.267714276     12.21   10.74 ~ 36 0
86 V* V2526 Ori RS* 05 35 33.4039956864 -01 52 35.609407572   11.80 12.18     G9 17 0
87 RX J0535.7-0418 TT* 05 35 42.0 -04 18 09     14.56     K3 3 0
88 V* V388 Ori Or* 05 35 44.0890442592 -05 08 37.596434172         15.622 K6 33 0
89 V* V1178 Ori TT* 05 35 59.7518657712 -06 16 06.685482828     13.426   11.96871 K7 49 0
90 BD-06 1248 TT* 05 36 01.38811 -06 50 13.9069           F2 12 0
91 V* V655 Ori Or* 05 36 04.5105551808 -05 09 28.857116376   15.80 14.44 14.15   ~ 26 0
92 V* V391 Ori Or* 05 36 10.1032646880 -05 22 05.023462836   14.40 16.20   13.26 M4.5 39 0
93 RX J0536.2-0519 TT* 05 36 11.8 -05 19 59           K4 2 0
94 V* V582 Ori TT* 05 36 21.83832 -06 26 02.0364     16.775   14.45078 M0 34 0
95 V* V2701 Ori TT* 05 36 39.8213573904 +09 07 15.589871400     12.49     K1 24 0
96 RX J0536.9+0608 TT* 05 36 52.9 +06 08 10           K0 3 0
97 HD 294243 TT* 05 36 57.9093338544 -03 00 46.097771652   10.90 10.20     G0 21 0
98 UCAC4 446-011156 TT* 05 37 33.7815279384 -00 53 51.855521532           K4 7 0
99 V* V1185 Ori Or* 05 37 39.1002510912 -05 08 39.990782076   16.20 14.70 14.61 12.65062 ~ 17 0
100 2MASS J05382368-0637446 TT* 05 38 23.6848742952 -06 37 44.598506772   12.97 11.95 12.19   K1.5 19 0
101 2MASS J05382377-0637408 TT* 05 38 23.7760672536 -06 37 40.716615468       12.84   K1e 16 0
102 Parenago 2675 ** 05 38 23.783 -06 37 41.00           K2.5 11 1
103 2MASS J05382875-0715466 Em* 05 38 28.7660728080 -07 15 46.622555460     15.0     ~ 3 0
104 BD-08 1195 V* 05 38 35.0071950768 -08 56 40.455825648   10.66 9.837   9.56 G7 28 0
105 2MASS J05384453+1302585 TT* 05 38 44.5360855800 +13 02 58.447005468   11.38 10.91     K2 10 0
106 2MASS J05385013-1320496 TT* 05 38 50.1257531184 -13 20 49.550788248   11.24 10.58     G0 8 0
107 [W96] 4771-119 TT* 05 38 54.1062760704 -02 49 29.807244084     13.31   11.95 K3(e) 29 0
108 Parenago 2752 TT* 05 38 56.6328047448 -06 24 40.924034208   11.48 10.83     G9 32 0
109 RX J0539.2+0101 TT* 05 39 14.771 +01 01 06.94           G2 6 0
110 SS 30 Y*O 05 39 15.2094045480 +09 50 04.423777836   12.58 11.75 11.52   ~ 22 0
111 V* V2745 Ori RS* 05 39 21.0777663120 +09 18 09.770926428   12.31 11.63     K1 11 0
112 V* V2747 Ori Or* 05 39 27.0980106120 -03 47 04.408409724   12.03 11.12 10.78   G8 15 0
113 V* V957 Ori Or* 05 39 31.57608 -02 49 08.9580           ~ 10 0
114 HD 294300 TT* 05 39 36.5371112376 -02 42 17.225796096   10.91 10.11   9.230 G5e 31 0
115 V* V2749 Ori Or* 05 39 45.151080 -02 04 53.80824   14.68 13.39 12.89 12.24 K4 6 0
116 2MASS J05394900-0138472 TT* 05 39 49.0065387120 -01 38 47.195340180     13.01     K3 15 0
117 RX J0539.9-0443 TT* 05 39 52.297 -04 43 35.00           F9 5 0
118 2MASS J05395534+0915370 TT* 05 39 55.3448707176 +09 15 36.952089120   12.06 11.56     K0 11 0
119 V* V2751 Ori RS* 05 39 56.5228190088 +09 56 31.546214268   11.75 11.17   9.759 K5+M3 16 0
120 Haro 5-36 TT* 05 40 01.9558295304 -02 21 32.633754840     16.63 15.46 13.88 M4.5 44 0
121 Haro 4-468 Y*O 05 40 05.7094897512 -06 27 56.672588268     15.0     K7/M0e 9 0
122 RX J0540.1-0737 TT* 05 40 05.8 -07 37 59           K3 4 0
123 V* V897 Ori Or* 05 40 06.1493091792 -06 28 20.203800168           ~ 7 0
124 V* V2755 Ori RS* 05 40 14.0347652520 -07 08 34.505356524           K0 12 0
125 V* V2756 Ori Or* 05 40 34.1778064440 -01 21 53.968688892     10.40     K5 14 0
126 RX J0540.8-0806 TT* 05 40 45.9 -08 06 36   14.23 12.87     K5 4 0
127 Haro 5-40 Y*O 05 40 46.7709117576 -02 10 50.086260516     16.0     M4.0 22 0
128 2MASS J05411933+0027518 TT* 05 41 19.337376 +00 27 51.80508   14.08 13.03 12.67   K2 10 0
129 V* V2758 Ori Or* 05 41 23.9428581864 -03 24 46.016418492   12.49 11.37     K1 23 0
130 2MASS J05414512+0944409 TT* 05 41 45.1326669576 +09 44 40.810973748   10.76 10.13     G6 18 0
131 V* V904 Ori Or* 05 41 57.1460284752 -05 56 38.694819192           K5e 8 0
132 2MASS J05421241-0205097 TT* 05 42 12.4191288888 -02 05 09.793255092     15.7   13.36 M2e 16 0
133 RX J0542.4-0626 * 05 42 25.0707718060 -06 26 34.045720846   12.773 12.003 11.806   G7 8 0
134 DIL 74 Em* 05 42 37.8903569434 +08 51 00.393643433   15.993 14.410 13.852   ~ 4 0
135 RX J0542.7-0925 TT* 05 42 39.0419632392 -09 24 55.454169600   12.70 12.16 11.88   K0(e) 19 0
136 V* V909 Ori Or* 05 42 55.8832724424 -07 18 38.423293020   15.684 14.213 13.860 11.561 M3 30 0
137 EM* LkHA 291 Y*O 05 42 58.8155610120 -02 18 37.135977732   16 13.0     ~ 19 0
138 [M59] 15 Em* 05 42 59.3031319368 +09 09 52.442253936   17.4       ~ 19 0
139 2MASS J05432712-0642528 TT* 05 43 27.1230411192 -06 42 52.788856104           G9 5 0
140 V* V626 Ori Or* 05 43 32.196576 +09 09 24.09804     14.71 14.19 12.76 M1 19 0
141 RX J0544.2-0941 TT* 05 44 08.3 -09 41 36   12.93 12.22     G9 4 0
142 ATO J086.0397-13.1092 TT* 05 44 09.5381429016 -13 06 33.250263120           K1 7 0
143 2MASS J05441217+0115356 TT* 05 44 12.1897812703 +01 15 35.556680483   13.05 11.84     K3 7 0
144 Haro 5-94 Or* 05 44 29.2435886280 -01 22 16.716051192     14.9     ~ 30 1
145 RX J0544.6-0121 X 05 44 34.0 -01 21 54           ~ 3 0
146 2MASS J05453501-1020455 TT* 05 45 35.0206896888 -10 20 45.610116756   12.03 11.46     G7 8 0
147 ATO J086.5167+12.5464 TT* 05 46 04.0191285240 +12 32 47.118190848   12.50 12.32 11.67   G9 13 0
148 RX J0546.7-1223 TT* 05 46 42.6 -12 23 29     13.30     G5 4 0
149 RX J0546.9-0507 TT* 05 46 51.076 -05 06 47.83     12.30     K4 3 0
150 EM* LkHA 312 Or* 05 47 14.0932945704 +00 00 15.668906436     15.1     ~ 33 0
151 VSS VI-20 PM* 05 47 17.9674420728 -00 00 48.786593040 13.59 13.21 10.928 10.444 9.074 M0V 36 0
152 V* V637 Ori Or* 05 47 48.8695992912 +08 33 26.030689848           ~ 13 0
153 2MASS J05493662+0232520 TT* 05 49 36.6246348600 +02 32 52.067001696   13.24 12.33     K2 12 0
154 2MASS J05503529-1249188 TT* 05 50 35.2911063168 -12 49 18.767777916     13.43     K6 3 0
155 ATO J087.7867+07.8159 TT* 05 51 08.8046097360 +07 48 57.726338940   12.96 11.93     K6 7 0
156 2MASS J05511418-0651506 TT* 05 51 14.1847341624 -06 51 50.569902216   11.40 11.01     K1 7 0
157 V* CN Ori CV* 05 52 07.7842206216 -05 25 00.543695772           ~ 184 0
158 2MASS J05521912-0557431 TT* 05 52 19.1164508760 -05 57 43.242332652     13.09     K2 9 0
159 2MASS J05543349-0736223 TT* 05 54 33.4992140544 -07 36 22.377856248   12.33 11.71     G6 13 0
160 RX J0556.1-0800 TT* 05 56 07.6904337456 -08 00 26.633464524   12.78 12.138   11.248 G8 15 0
161 HD 249494 TT* 05 56 27.7474318368 +06 19 34.586879088   11.32 10.42 10.22   G0 9 0
162 2MASS J05564682-0611093 TT* 05 56 46.8306260352 -06 11 09.317404752   12.80 11.87     K5 6 0
163 2MASS J05575680+0929082 TT* 05 57 56.8050909120 +09 29 08.160304308   11.86 11.22     G9 11 0
164 2MASS J05580196-0145205 TT* 05 58 01.9634101872 -01 45 20.665757844   12.51 12.00     K1 6 0

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