2004PASP..116.1035W

Query : 2004PASP..116.1035W

2004PASP..116.1035W - Publ. Astron. Soc. Pac., 116, 1035-1038 (2004/November-0)

A deep objective prism survey for classical T Tauri stars in the σ Orionis region.

WEAVER W.B. and BABCOCK A.

Abstract (from CDS):

A very deep 1976 CTIO Curtis-Schmidt objective prism plate of the σ Orionis association taken under excellent conditions has permitted us to search for fainter classical T Tauri stars associated with this cluster. We have discovered 63 Hα emission stars in the area to a limiting magnitude of about 18. Most of these stars are new additions to the growing list of pre-main-sequence objects identified in this very dense, very young cluster. Since T Tauri stars vary in light and emission-line strength on all timescales, these data also provide an historical record of the association. By comparing these with later observations, we are able to estimate the average space density of the Hα emission-line stars in the surveyed area as between 0.52 and 0.86/pc3 down to a spectral class of dM0. This is about a third of the number of dwarf or subgiant stars in the region that could have been detected as emission-line stars in these surveys.

Abstract Copyright: ∼

Journal keyword(s): Stars: Formation - Stars: Pre-Main-Sequence - Stars: Statistics

Nomenclature: Table 1: [WB2004] NN (Nos 1-63).

Simbad objects: 66

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Number of rows : 66
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 ATO J083.0537-03.2541 Em* 05 32 12.8954915544 -03 15 14.805691848   17.1 14.2     ~ 5 0
2 [WB2004] 2 Em* 05 34 16.6 -02 45 53     17     ~ 1 0
3 2MASS J05342664-0241074 Em* 05 34 26.64 -02 41 07.4   17.2 15.1     ~ 1 0
4 Haro 5-83 Or* 05 34 34.2381412608 -02 58 16.647478824   18.7 17.6     ~ 10 0
5 Haro 5-1 Em* 05 34 49.9456478520 -02 44 08.419946028   18.6 15.1     ~ 5 0
6 Haro 5-2 Y*O 05 35 07.5337079201 -02 48 59.721051651   16.52 15.14 14.39   ~ 9 0
7 Haro 5-3 Y*O 05 35 21.7057434528 -02 49 53.881601844   17.29 15.81 15.17   ~ 11 0
8 2MASS J05372615-0232444 Em* 05 37 26.1594097488 -02 32 44.327318712   15.1 13.8     ~ 1 0
9 2MASS J05374556-0258210 Em* 05 37 45.5728466304 -02 58 20.957574216   16.4 14.0     ~ 1 0
10 ESO-HA 1638 Em* 05 37 53.9802157992 -02 49 54.536632932   20.07 18.47 17.19 15.71 M2.5: 13 0
11 2MASS J05375753-0245472 Em* 05 37 57.5368119720 -02 45 47.215037844   17.0 15.0     ~ 1 0
12 [WB2004] 12 Em* 05 38 00.8 -02 32 04     14.6     ~ 1 0
13 2MASS J05380097-0226079 TT* 05 38 00.9734850576 -02 26 07.932579252   18.08 16.71 15.57 14.27 M2.5 21 0
14 2MASS J05380836-0252233 Em* 05 38 08.3670777792 -02 52 23.379292308   15.7 13.8     ~ 1 0
15 2MASS J05381506-0245197 Em* 05 38 15.0707659104 -02 45 19.299209724   19.3 16.4     ~ 1 0
16 Kiso A-0976 327 Y*O 05 38 22.5457935960 -03 11 56.678376768   16.73 15.89 14.94 13.83 ~ 10 0
17 2MASS J05382310-0236269 Em* 05 38 23.0992635600 -02 36 26.977034124     17.0     ~ 4 0
18 V* V505 Ori TT* 05 38 27.2560402224 -02 45 09.705640104     14.16 13.54 12.85 K7e 49 0
19 Haro 5-9 TT* 05 38 29.1605610504 -02 16 15.770920332   15.40 14.45 13.20 12.954 K6.5 28 0
20 Haro 5-11 TT* 05 38 31.4247760176 -02 36 33.894690768 16.59 17.36 16.42 15.22 13.82 M3.5 24 0
21 2MASS J05383459-0244040 Em* 05 38 34.5903059520 -02 44 04.098494256   16.9 13.9     ~ 1 0
22 UCAC2 30800097 TT* 05 38 41.2928547432 -02 37 22.626301404 16.93 15.86 14.54 14.192 12.78 M0.0 26 0
23 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 567 0
24 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 802 0
25 Haro 5-18 TT* 05 38 59.2270703712 -02 33 51.416508384 18.648 17.62 16.55 15.59 14.43 M2.5 28 0
26 2MASS J05390203-0216131 Em* 05 39 02.0325217200 -02 16 13.193526036   18.1 15.8     ~ 1 0
27 UCAC4 437-010930 TT* 05 39 02.9786833104 -02 41 27.164775444 17.71 17.87 16.51 15.33 13.93 M2.5 22 0
28 ESO-HA 1693 TT* 05 39 03.5780102112 -02 46 27.054378984   18.04 16.94 15.82 14.37 M3.5 24 0
29 [HHM2007] 872 Em* 05 39 04.7510209008 -02 17 07.990355040   14.8 13.90     ~ 7 0
30 2MASS J05390724-0220264 Em* 05 39 07.2523702344 -02 20 26.455040772   16.5 14.4     ~ 1 0
31 Haro 5-19 TT* 05 39 07.6049425848 -02 32 39.192952344 16.743 15.24 13.99 13.18 12.41 K6.5 29 0
32 Haro 5-20 TT* 05 39 11.5179186744 -02 31 06.580001460 18.295 16.98 15.45 14.56 13.56 M0.0 33 0
33 Haro 5-21 TT* 05 39 18.8360108640 -02 30 53.221941684 17.563 15.88 14.41 13.49 12.60 K7.0 30 0
34 2MASS J05392230-0216263 Em* 05 39 22.3057317144 -02 16 26.374315872   16.7 15.2     ~ 1 0
35 V* BG Ori TT* 05 39 25.2030748440 -02 38 22.059069252   15.88 14.72 13.78 12.83 K7.5 38 0
36 2MASS J05392602-0218561 Em* 05 39 26.0261715240 -02 18 56.191367520   18.2 16.1     ~ 1 0
37 Haro 5-22 TT* 05 39 26.4000282864 -02 15 03.466969236     14.51 13.80 13.175 K4.5 17 0
38 UCAC4 438-011271 TT* 05 39 29.3528446680 -02 27 21.038927076         14.807 M0.0 26 0
39 Kiso A-0976 353 Y*O 05 39 34.49088 -03 17 48.0156     17.7     ~ 8 0
40 Haro 5-25 TT* 05 39 39.3780952152 -02 17 04.499525544   16.95 15.35 14.29 13.24 M0.0 30 0
41 V* RV Ori TT* 05 39 40.1685239784 -02 20 48.032941848     13.90   12.715 K5.0 31 0
42 V* V511 Ori Or* 05 39 42.787560 -02 58 53.93316   15.35 14.25 13.91 12.27 M1.5 17 0
43 2MASS J05394493-0223259 Em* 05 39 44.9280609384 -02 23 25.999709316   17.5 15.7     ~ 1 0
44 Haro 5-30 TT* 05 39 51.7265730336 -02 22 47.261235504   19.33 17.95 16.40 14.64 M5.5e 28 0
45 Haro 5-32 TT* 05 39 53.6204045688 -02 33 42.724290960 16.971   16.92 15.84 14.32 M4 33 0
46 [WB2004] 44 Em* 05 39 53.7433798680 -02 31 35.651672004     14.7     ~ 1 0
47 V* V605 Ori TT* 05 39 54.280104 -02 24 39.42216     15.01 14.91 12.808 M1.0 22 0
48 2MASS J05395929-0127059 Em* 05 39 59.3071315008 -01 27 05.987369016     16.0     ~ 2 0
49 Haro 5-36 TT* 05 40 01.9558295304 -02 21 32.633754840     16.63 15.46 13.88 M4.5 34 0
50 Haro 5-35 Y*O 05 40 03.6569319024 -02 16 46.185153636     14.95 13.87 13.061 M0.5 17 0
51 V* V608 Ori TT* 05 40 08.8861654944 -02 33 33.783037632     14.63 14.09 13.907 K7.5 42 0
52 Haro 5-38 TT* 05 40 12.8662611576 -02 22 02.167886532   14.94 13.70   11.858 K5.5 21 0
53 V* V610 Ori Or* 05 40 22.4379771432 -02 15 39.985389468     16.69 14.90 13.93 ~ 14 0
54 [WB2004] 51 Em* 05 40 48.2 -02 11 47     15.2     ~ 1 0
55 Haro 5-44 Or* 05 40 51.4823997120 -02 36 02.455178220     17.5     M3: 8 0
56 [WB2004] 53 Em* 05 41 33.8 -02 17 22     17     ~ 2 0
57 Haro 5-49 Y*O 05 41 36.3946121472 -02 16 46.288930044     17.7   14.75 M3.0 22 0
58 EM* LkHA 287 Y*O 05 41 40.2912995616 -02 15 59.672390256   17.5 14.6     ~ 8 0
59 [WB2004] 59 Em* 05 41 41.5121342640 -02 15 43.860087144     17.5     ~ 2 0
60 [S83b] NGC 2023 G Y*O 05 41 42.2628925488 -02 17 35.975066100           ~ 9 0
61 2MASS J05414308-0217398 Y*O 05 41 43.0856500608 -02 17 39.846299712     15.2   14.57 ~ 4 0
62 2MASS J05414424-0216164 Y*O 05 41 44.2494965736 -02 16 16.570842708     17     M4.0 9 0
63 Haro 5-55 Or* 05 42 19.4895005208 -02 15 40.939824492     16.6   14.10 ~ 17 0
64 Kiso A-0904 143 Y*O 05 42 45.8144831592 -02 15 23.334605496   16.49 15.18 14.93   ~ 11 0
65 2MASS J05425856-0218054 Em* 05 42 58.5632166888 -02 18 05.418981144           ~ 1 0
66 HD 38087 ** 05 43 00.5754723576 -02 18 45.389406240 7.96 8.40 8.29 8.06 7.89 B3II 168 1

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