1998A&A...336..242H

Query : 1998A&A...336..242H

1998A&A...336..242H - Astronomy and Astrophysics, volume 336242-250 (1998/8-1)

The nature of isolated T Tauri stars.

HOFF W., HENNING T. and PFAU W.

Abstract (from CDS):

We present the results of a search for young stellar objects around the two isolated T Tauri stars (TTSs) TW Hya and CoD-29 8887. From the spectroscopic properties of these two objects, it is obvious that they are T Tauri stars, although they are not associated with a star-forming region as it is the case for most of the known TTSs. Especially TW Hya is the only classical TTS that is not located in a dark cloud with star formation activity. The same is true for the weak-line T Tauri star CoD-29 8887. We searched for pre-main sequence stars using ROSAT PSPC observations pointing at our two main targets. With a sophisticated search strategy we could identify 107 X-ray sources in our fields. For the 37 stellar-like optical counterparts we did spectroscopic follow-up observations. These show that within the viewing field of ROSAT there are no other X-ray emitting young stellar objects around TW Hya and CoD-29 8887. For the isolated TTSs TW Hya and HD 98800 Hipparcos parallax measurements are available locating them at distances of 56 and 46pc, respectively. This means that they are the closest TTSs with circumstellar dusty disks known today. The space velocities of these two objects are 3-5km/sec. From their position in the HR diagram, we obtained an age of about 107 years. Hence, we conclude that these two objects travelled not far away from their original birthplace and their parental molecular cloud dispersed meanwhile. This is the solution why these T Tauri stars appear to be isolated.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: pre-main sequence - stars: individual: TW Hya - stars: individual: CoD-29 8887 - stars: individual: HD 98800 - X-rays: stars

Nomenclature: Table 2: [HHP98] TW Hya XNN (Nos X1-X58). Table 3: [HHP98] CoD-29 8887 XNN (Nos X1-X49). Table 4: [HHP98] TW Hya XNNA N=9, [HHP98] CoD-29 8887 XNNA N=4.

Simbad objects: 125

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Number of rows : 125
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 [HHP98] TW Hya X01 X 10 58 08.22 -34 42 23.6           ~ 1 0
2 [HHP98] TW Hya X02 X 10 59 44.96 -34 46 18.3           ~ 1 0
3 [HHP98] TW Hya X20 X 10 59 45.00 -34 46 18.7           ~ 1 0
4 [HHP98] TW Hya X03 X 10 59 52.75 -34 45 53.3           ~ 1 0
5 [HHP98] TW Hya X30 X 10 59 52.81 -34 45 53.7           ~ 1 0
6 [HHP98] TW Hya X40 X 11 00 02.19 -35 06 50.8           ~ 1 0
7 CD-34 7135 PM* 11 00 02.7856829376 -35 06 36.552195792   12.76 11.212 10.801   M0.5Vk 26 0
8 [HHP98] TW Hya X05 X 11 00 26.93 -34 56 58.6           ~ 1 0
9 [HHP98] TW Hya X50 X 11 00 26.99 -34 56 59.0           ~ 1 0
10 [HHP98] TW Hya X60 X 11 00 30.39 -34 35 07.1           ~ 1 0
11 [HHP98] TW Hya X07 X 11 00 38.80 -34 46 13.6           ~ 1 0
12 XBS J110050.6-344331 X 11 00 50.00 -34 43 25.5           ~ 3 0
13 HD 95490 * 11 00 51.2454380904 -35 33 36.267762096   8.86 8.37     F7/8V 9 0
14 GSC 07208-00970 * 11 01 00.1909926408 -34 32 16.963198872           ~ 4 0
15 GSC 07208-01098 * 11 01 00.5026607256 -34 31 32.401147512           ~ 4 0
16 [HHP98] TW Hya X10 X 11 01 02.18 -34 32 01.2           ~ 2 0
17 TYC 7208-732-1 * 11 01 02.3041426728 -34 31 42.989321604   11.87 11.31     ~ 1 0
18 [HHP98] TW Hya X11 X 11 01 03.06 -34 48 48.7           ~ 1 0
19 [HHP98] TW Hya X12 X 11 01 06.79 -34 53 19.3           ~ 1 0
20 [HHP98] TW Hya X13 X 11 01 07.07 -34 41 19.3           ~ 1 0
21 [HHP98] TW Hya X14 X 11 01 17.37 -34 51 56.0           ~ 1 0
22 XBS J110119.0-345303 X 11 01 18.62 -34 53 10.1           ~ 2 0
23 [HHP98] TW Hya X16 X 11 01 25.35 -34 40 42.2           ~ 1 0
24 [HHP98] TW Hya X17 X 11 01 25.52 -34 32 55.7           ~ 1 0
25 [HHP98] TW Hya X18 X 11 01 31.28 -34 10 56.6           ~ 1 0
26 [HHP98] TW Hya X19 X 11 01 32.48 -34 42 36.3           ~ 1 0
27 [HHP98] TW Hya X21 X 11 01 37.43 -34 04 26.2           ~ 1 0
28 [HHP98] TW Hya X22 X 11 01 37.8332130216 -34 16 41.045973168           ~ 1 0
29 [HHP98] TW Hya X23 X 11 01 43.04 -34 52 57.8           ~ 1 0
30 [HHP98] TW Hya X24 X 11 01 44.29 -35 02 14.3           ~ 1 0
31 [HHP98] TW Hya X25 X 11 01 46.82 -34 57 17.4           ~ 1 0
32 [HHP98] TW Hya X26 X 11 01 48.32 -34 54 56.9           ~ 1 0
33 [HHP98] TW Hya X27 X 11 01 48.83 -34 34 35.9           ~ 1 0
34 [HHP98] TW Hya X28 X 11 01 50.40 -34 37 19.9           ~ 1 0
35 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1
36 [HHP98] TW Hya X29 X 11 01 51.94 -34 47 52.4           ~ 1 0
37 [HHP98] TW Hya X31 X 11 01 52.11 -34 43 56.4           ~ 1 0
38 1RXS J110154.3-344034 X 11 01 54.3 -34 40 34           ~ 1 0
39 [HHP98] TW Hya X33 X 11 02 01.63 -34 23 42.8           ~ 1 0
40 [HHP98] TW Hya X34 X 11 02 06.55 -34 52 02.8           ~ 1 0
41 [HHP98] TW Hya X35 X 11 02 09.73 -34 42 49.8           ~ 1 0
42 [HHP98] TW Hya X36 X 11 02 10.39 -33 59 53.3           ~ 1 0
43 [HHP98] TW Hya X37 X 11 02 17.37 -34 30 44.2           ~ 1 0
44 [HHP98] TW Hya X38 X 11 02 19.13 -35 04 56.7           ~ 1 0
45 [HHP98] TW Hya X39 X 11 02 21.63 -34 12 38.7           ~ 1 0
46 1RXS J110226.7-350318 X 11 02 26.7 -35 03 18           ~ 1 0
47 GSC 07208-00559 * 11 02 27.4179632880 -34 39 19.806756768           ~ 4 0
48 [HHP98] TW Hya X42 X 11 02 28.91 -34 32 01.0           ~ 1 0
49 GSC 07208-00445 * 11 02 29.4097153560 -34 37 58.095330132   13.034 11.869     ~ 8 0
50 [HHP98] TW Hya X43 X 11 02 30.87 -34 38 42.4           ~ 1 0
51 [HHP98] TW Hya X44 X 11 02 35.83 -34 46 12.8           ~ 1 0
52 [HHP98] TW Hya X45 X 11 02 36.16 -34 42 44.3           ~ 1 0
53 XBS J110244.1-344604 X 11 02 43.50 -34 46 06.2           ~ 2 0
54 [HHP98] TW Hya X46 X 11 02 43.57 -35 21 41.7           ~ 1 0
55 [HHP98] TW Hya X48 X 11 02 50.21 -34 43 37.5           ~ 1 0
56 [HHP98] TW Hya X49 X 11 02 53.15 -34 48 35.9           ~ 1 0
57 [HHP98] TW Hya X51 X 11 03 03.01 -34 48 15.5           ~ 1 0
58 [HHP98] TW Hya X52 X 11 03 04.16 -34 40 31.6           ~ 1 0
59 [HHP98] TW Hya X53 X 11 03 08.20 -34 43 07.4           ~ 1 0
60 [HHP98] TW Hya X54 X 11 03 19.14 -34 53 55.0           ~ 1 0
61 [HHP98] TW Hya X55 X 11 03 24.68 -34 43 15.2           ~ 1 0
62 [HHP98] TW Hya X56 X 11 03 33.17 -34 56 12.3           ~ 1 0
63 [HHP98] TW Hya X57 X 11 03 45.24 -34 18 08.1           ~ 1 0
64 [HHP98] TW Hya X58 X 11 04 02.61 -34 49 56.6           ~ 1 0
65 [HHP98] CoD-29 8887 X1 X 11 05 56.33 -30 22 00.3           ~ 1 0
66 [HHP98] CoD-29 8887 X2 X 11 07 08.99 -29 50 51.7           ~ 1 0
67 1RXS J110727.2-302813 X 11 07 27.2 -30 28 13           ~ 1 0
68 [HHP98] CoD-29 8887 X4 X 11 07 29.59 -30 06 26.9           ~ 1 0
69 [HHP98] CoD-29 8887 X5 X 11 07 30.25 -29 23 20.4           ~ 1 0
70 [HHP98] CoD-29 8887 X6 X 11 07 30.92 -29 38 18.9           ~ 1 0
71 [HHP98] CoD-29 8887 X7 X 11 07 50.27 -30 04 27.7           ~ 1 0
72 [HHP98] CoD-29 8887 X8 X 11 07 54.93 -30 10 21.5           ~ 1 0
73 [HHP98] CoD-29 8887 X9 X 11 08 03.30 -30 00 24.2           ~ 1 0
74 [HHP98] CoD-29 8887 X10 X 11 08 21.79 -29 44 57.3           ~ 1 0
75 [HHP98] CoD-29 8887 X11 X 11 08 22.18 -30 07 43.8           ~ 1 0
76 [HHP98] CoD-29 8887 X12 X 11 08 25.68 -30 12 52.8           ~ 1 0
77 [HHP98] CoD-29 8887 X13 X 11 08 27.24 -30 01 00.9           ~ 1 0
78 [HHP98] CoD-29 8887 X14 X 11 08 29.60 -30 09 22.9           ~ 1 0
79 HD 96803 * 11 08 34.4514634608 -30 07 38.936633376   8.39 7.93     F5V 19 0
80 [HHP98] CoD-29 8887 X16 X 11 08 35.60 -30 11 38.0           ~ 1 0
81 [HHP98] CoD-29 8887 X17 X 11 08 42.19 -30 06 32.2           ~ 1 0
82 [HHP98] CoD-29 8887 X18 X 11 08 59.74 -29 37 43.3           ~ 1 0
83 GSC 07201-00475 * 11 09 07.6555874400 -30 20 09.040505892           ~ 1 0
84 [HHP98] CoD-29 8887 X19 X 11 09 08.07 -30 20 27.8           ~ 1 0
85 CD-29 8885 PM* 11 09 09.3911988072 -30 20 46.496230764   9.93 9.35     F6 3 0
86 [HHP98] CoD-29 8887 X20 X 11 09 09.78 -30 02 53.9           ~ 1 0
87 [HHP98] CoD-29 8887 X21 X 11 09 10.31 -30 13 13.9           ~ 1 0
88 GSC 07201-00289 * 11 09 12.5848283616 -30 02 30.251999724   17.73   16.35   ~ 3 0
89 [HHP98] CoD-29 8887 X22 X 11 09 13.31 -30 24 48.4           ~ 1 0
90 CD-29 8887 TT* 11 09 13.7928873024 -30 01 39.968872752   12.95 11.119 10.642 8.875 M2Ve 141 0
91 [HHP98] CoD-29 8887 X24 X 11 09 15.77 -30 03 05.9           ~ 1 0
92 2MASX J11091617-3002389 EmG 11 09 16.1605810272 -30 02 38.741371872           ~ 4 0
93 [HHP98] CoD-29 8887 X25 X 11 09 16.64 -29 50 07.4           ~ 1 0
94 [HHP98] CoD-29 8887 X26 X 11 09 19.15 -30 00 47.4           ~ 1 0
95 [HHP98] CoD-29 8887 X27 X 11 09 24.30 -30 14 33.8           ~ 1 0
96 [HHP98] CoD-29 8887 X28 X 11 09 28.25 -29 37 46.8           ~ 1 0
97 [HHP98] CoD-29 8887 X29 X 11 09 34.51 -30 09 26.7           ~ 1 0
98 [HHP98] CoD-29 8887 X30 X 11 09 36.37 -30 12 20.2           ~ 1 0
99 [HHP98] CoD-29 8887 X31 X 11 09 38.59 -30 01 00.6           ~ 1 0
100 [HHP98] CoD-29 8887 X32 X 11 09 39.24 -29 33 25.1           ~ 1 0
101 [HHP98] CoD-29 8887 X33 X 11 09 39.62 -30 06 18.6           ~ 1 0
102 [HHP98] CoD-29 8887 X34 X 11 09 40.49 -30 02 27.7           ~ 1 0
103 [HHP98] CoD-29 8887 X35 X 11 09 40.68 -29 47 09.7           ~ 1 0
104 [HHP98] CoD-29 8887 X36 X 11 09 40.78 -29 59 18.2           ~ 1 0
105 [HHP98] CoD-29 8887 X37 X 11 09 49.12 -30 04 23.5           ~ 1 0
106 [HHP98] CoD-29 8887 X38 X 11 09 49.19 -30 08 36.0           ~ 1 0
107 [HHP98] CoD-29 8887 X39 X 11 09 50.91 -29 55 21.4           ~ 1 0
108 [HHP98] CoD-29 8887 X40 X 11 09 56.68 -29 49 09.3           ~ 1 0
109 HD 97022 PM* 11 09 58.7398112256 -29 47 39.021372564   8.15 6.80     K2III 14 0
110 [HHP98] CoD-29 8887 X41 X 11 10 02.16 -30 10 20.3           ~ 1 0
111 [HHP98] CoD-29 8887 X42 X 11 10 05.43 -29 57 03.7           ~ 1 0
112 [HHP98] CoD-29 8887 X43 X 11 10 13.06 -30 13 35.0           ~ 1 0
113 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 218 0
114 TWA 3A TT* 11 10 27.9121410480 -37 31 51.535547940   14.04 12.57   9.10 M4Ve 221 0
115 [HHP98] CoD-29 8887 X44 X 11 10 30.74 -30 17 28.9           ~ 1 0
116 HD 97131 SB* 11 10 34.2447505824 -30 27 18.611386380   9.17 8.80     F2V 32 1
117 [HHP98] CoD-29 8887 X46 X 11 10 44.73 -29 48 52.8           ~ 1 0
118 [HHP98] CoD-29 8887 X47 X 11 10 53.00 -30 11 39.4           ~ 1 0
119 [HHP98] CoD-29 8887 X48 X 11 11 10.28 -30 09 33.6           ~ 1 0
120 [HHP98] CoD-29 8887 X49 X 11 11 38.85 -30 07 07.2           ~ 1 0
121 HD 98800 TT* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 401 0
122 GSC 07208-00992 X ~ ~           ~ 1 0
123 [HHP98] TW Hya X33B X ~ ~           ~ 1 0
124 [HHP98] TW Hya X27B X ~ ~           ~ 1 0
125 [HHP98] TW Hya X33A X ~ ~           ~ 1 0

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