2005A&A...443..541G


Query : 2005A&A...443..541G

2005A&A...443..541G - Astronomy and Astrophysics, volume 443, 541-556 (2005/11-4)

Weak-line T Tauri stars: circumstellar disks and companions. I. Spectral energy distributions and infrared excesses.

GRAS-VELAZQUEZ A. and RAY T.P.

Abstract (from CDS):

We have analysed new infrared photometric data taken by the Infrared Space Observatory, in combination with 2MASS data where available, of 12 weak-line T Tauri stars (WTTS), belonging to different molecular clouds. A control study of 6 classical T Tauri stars (CTTS) for comparison with IRAS data has also been made. WTTS traditionally are not expected to have any circumstellar material, but we have found that 11 of the WTTS studied, have a spectral energy distribution that suggests the presence of reprocessing circumstellar disks, albeit half of them with apparent inner ``dust holes''. The spectral energy distribution curves of all the stars in our sample show infrared excess in all cases except one. We have also searched for companions to these stars and studied their possible contributions to the infrared emission. We find that 10 of the WTTS with excess infrared emission have companions that may contribute measurably and, in some cases significantly, at infrared wavelengths. In the case of the binary systems, the amount of excess due to the companion is still unclear but it is unlikely they are the only source of all the observed excess. We give estimations of the excesses and masses of the stars and also find their ages and radii to be in agreement with those expected for TTauri stars. Our results suggest there is a continuum in infrared excess properties from CTTS to WTTS rather than a clear differentiation based on a somewhat arbitrary EW(Hα) criterion.

Abstract Copyright:

Journal keyword(s): stars: formation - infrared: stars - stars: pre-main sequence - circumstellar matter - techniques: photometric

Simbad objects: 33

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Number of rows : 33
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Ass Cep OB 4 As* 00 02 +67.7           ~ 72 1
2 V* CS Cha Or* 11 02 24.8763629208 -77 33 35.667131796   12.88 11.69   10.123 K2Ve 210 0
3 [DB2002b] G300.23-16.89 DNe 11 54 31 -79 27.8           ~ 43 1
4 V* T Cha Or* 11 57 13.5245085552 -79 21 31.530508884   10.00 11.86     K0e 256 1
5 Lupus 1 Cld 15 43 02.1 -34 09 06           ~ 256 0
6 CD-33 10685 Or* 15 45 12.8678037432 -34 17 30.644403036 12.47 11.56 10.224 9.60 8.685 K3Ve 249 1
7 V* RU Lup Or* 15 56 42.3108692112 -37 49 15.473946900 9.27 10.07 9.60     K7/M0e 426 0
8 Lupus 2 MoC 15 57 08 -37 47.1           ~ 106 1
9 HD 325367 Or* 16 03 05.4915085848 -40 18 25.426727676   11.40 8.50     M0 314 0
10 Lupus 3 SFR 16 09.6 -39 03           ~ 305 0
11 THA 15-43 TT* 16 11 53.3512768320 -39 02 15.785435040   14.44 13.04 12.33 11.46 ~ 23 0
12 Barnard 42 DNe 16 25 -23.4           ~ 5 0
13 ATO J246.3514-23.9197 TT* 16 25 24.3632877288 -23 55 10.614768528   17.03 15.39     ~ 30 0
14 DoAr 24 TT* 16 26 17.0743951968 -24 20 21.594730920   16.06 14.21 14.02 11.57 K7.5V 103 1
15 GSS 31 TT* 16 26 23.3684537424 -24 20 59.579380248   15.9 14.70 14.33 11.53 K0e 138 1
16 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 174 1
17 WLY 2-55 TT* 16 27 52.0872222936 -24 40 50.723707476     16.28 14.48 12.78 K7.5 79 0
18 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3375 1
19 Wa Oph 4 Or* 16 48 18.0034524096 -14 11 15.801239760   15.40 13.46     K5Ve 30 0
20 Hen 3-1258 Or* 16 48 45.6326070624 -14 16 35.849828856   14.94 13.34 12.84   K6 105 0
21 LDN 162 DNe 16 49 03 -14 10.7           ~ 21 0
22 HBC 272 Or* 17 09 48.1640810928 -27 16 59.272010256   12.25 11.80     ~ 26 0
23 LDN 1746 DNe 17 11.3 -27 22           ~ 126 0
24 LDN 100 DNe 17 15 55.670 -20 56 02.93           ~ 33 0
25 V* V1725 Oph RR? 17 16 13.8648146400 -20 57 45.489902544           ~ 14 0
26 2MASS J18281352-0002492 Y*? 18 28 13.5200276064 -00 02 49.349481072   15.1       K5: 20 0
27 HBC 666 Y*? 18 28 15.1291328856 -00 02 41.057358864           ~ 6 1
28 HBC 667 Em* 18 28 15.2586162309 -00 02 43.220398207   17.3       K7 20 1
29 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1021 2
30 HBC 672 Em* 18 29 56.8848005064 +01 14 46.304766672   17.6       K8.0 100 0
31 LDN 572 DNe 18 30.6 +00 02           ~ 6 0
32 V* V536 Aql Or* 19 38 57.413016 +10 30 15.99804     14.85 12.27   KV:e 58 0
33 V* NO Cep Or* 23 54 26.7523661616 +66 54 18.570275028   15.59 14.50     K2 15 0

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2022.08.14-11:49:11

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