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


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET01:54:16

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 - 2021
#notes
1 Ass Cep OB 4 As* 00 02 +67.7           ~ 67 1
2 V* CS Cha Or* 11 02 24.8849252208 -77 33 35.683462615   12.88 11.69   10.123 K2Ve 201 0
3 [DB2002b] G300.23-16.89 DNe 11 54 31 -79 27.8           ~ 43 1
4 V* T Cha Or* 11 57 13.5268556629 -79 21 31.521755129   10.00 11.86     K0e 241 1
5 NAME Lupus I Cld 15 43 02.1 -34 09 06           ~ 236 0
6 CD-33 10685 Or* 15 45 12.8670160093 -34 17 30.646921079 12.47 11.56 10.224 9.60 8.685 K3Ve 230 1
7 V* RU Lup Or* 15 56 42.3109948086 -37 49 15.473469159 9.27 10.07 9.60     K7/M0e 400 0
8 NAME Lup II MoC 15 57 08 -37 47.1           ~ 97 1
9 HD 325367 Or* 16 03 05.4914377137 -40 18 25.426543472   11.40 8.50     M0 293 0
10 NAME Lupus III SFR 16 09.6 -39 03           ~ 283 0
11 THA 15-43 TT* 16 11 53.3511161559 -39 02 15.784487677   14.44 13.04 12.33 11.46 ~ 22 0
12 Barnard 42 DNe 16 25 -23.4           ~ 5 0
13 2MASS J16252434-2355103 TT* 16 25 24.3567454098 -23 55 11.011537196   17.03 15.39     ~ 29 0
14 DoAr 24 TT* 16 26 17.0747576971 -24 20 21.594542024   16.06 14.21 14.02 11.57 K7.5V 103 1
15 GSS 31 TT* 16 26 23.3694945462 -24 20 59.580653864   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 168 1
17 WLY 2-55 TT* 16 27 52.0863419872 -24 40 50.713643148     16.28 14.48 12.78 K7.5 79 0
18 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3138 1
19 Wa Oph 4 Or* 16 48 18.0036179356 -14 11 15.795986860   15.40 13.46     K5Ve 30 0
20 Hen 3-1258 Or* 16 48 45.6323559591 -14 16 35.849943900   14.94 13.34 12.84   K6 91 0
21 LDN 162 DNe 16 49 03 -14 10.7           ~ 20 0
22 HBC 272 Or* 17 09 48.1640415905 -27 16 59.270415552   12.25 11.80     ~ 25 0
23 LDN 1746 DNe 17 11.3 -27 22           ~ 117 0
24 LDN 100 DNe 17 15 55.670 -20 56 02.93           ~ 33 0
25 V* V1725 Oph RR* 17 16 13.8642020879 -20 57 45.691048034           ~ 14 0
26 HBC 665 Em* 18 28 13.5200738002 -00 02 49.355955640   15.1       K5: 19 0
27 HBC 666 Em* 18 28 15.19 -00 02 41.6           ~ 5 1
28 HBC 667 Em* 18 28 15.249 -00 02 43.37   17.3       K7 19 1
29 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 962 2
30 HBC 672 Em* 18 29 56.8828626544 +01 14 46.339137067   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 26.7522521842 +66 54 18.569611880   15.59 14.50     K2 15 0

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2021.03.08-01:54:16

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