2008A&A...481..423G

Query : 2008A&A...481..423G

2008A&A...481..423G - Astronomy and Astrophysics, volume 481423-432 (2008/4-2)

Accretion properties of T Tauri stars in σ Orionis.

GATTI T., NATTA A., RANDICH S., TESTI L. and SACCO G.

Abstract (from CDS):

Accretion disks around young stars evolve in time with time scales of a few million years. We present here a study of the accretion properties of a sample of 35 stars in the ∼3 million-year-old star-forming region σ Ori. Of these, 31 are objects with evidence of disks, based on their IR excess emission. We use near-IR hydrogen recombination lines (Paγ) to measure their mass accretion rate. We find that the accretion rates are significant lower in σ Ori than in younger regions, such as ρ Oph, consistently with viscous disk evolution. The HeI 1.083µm line is detected (either in absorption or in emission) in 72% of the stars with disks, also providing evidence of accretion-powered activity in very low accretors, where other accretion indicators disappear.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - accretion, accretion disks

Nomenclature: Table 1: [GNR2008] NN (Nos 1-35).

Simbad objects: 42

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Number of rows : 42
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 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
2 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 623 0
3 2MASS J05375613-0209266 Or* 05 37 56.1345981792 -02 09 26.671509036   20.64 18.92 17.49 15.68 ~ 14 0
4 2MASS J05375840-0241262 Or* 05 37 58.4022378912 -02 41 26.234314764   21.06 18.63 17.26 15.31 M5.5 25 0
5 Kiso A-0976 326 TT* 05 38 18.8587986024 -02 51 38.946956472   18.20 16.81 15.65 14.25 M2.5 36 0
6 [W96] rJ053820-0234 TT* 05 38 20.5029803016 -02 34 08.974652808   20.99 19.39 17.68 15.74 M4e 37 0
7 V* V505 Ori TT* 05 38 27.2560402224 -02 45 09.705640104     14.16 13.54 12.85 K7e 65 0
8 Kiso A-0976 329 TT* 05 38 27.5110120944 -02 35 04.225488108 18.90 18.59 17.17 15.92 14.37 M3.5e 42 0
9 Haro 5-11 TT* 05 38 31.4247760176 -02 36 33.894690768 16.59 17.36 16.42 15.22 13.82 M3.5 26 0
10 [W96] rJ053831-0235 TT* 05 38 31.5873593664 -02 35 15.081924804 19.243 17.17 15.85 14.88 13.77 M0e 31 0
11 2MASS J05383431-0235000 TT* 05 38 34.3155897720 -02 35 00.166471512 17.079 15.25 13.95 13.13 12.35 K7.0 31 0
12 2MASS J05383460-0241087 TT* 05 38 34.6040244960 -02 41 08.823514236 18.85 19.71 17.76 16.62 15.00 M2.0 27 0
13 [W96] rJ053835-0231 TT* 05 38 35.4679746552 -02 31 51.698592264 17.174 15.48 14.19 13.37 12.55 K7.0 32 0
14 2MASS J05383902-0245321 TT* 05 38 39.0315633456 -02 45 32.214599712     17.26 15.92 14.58 M2.5 41 0
15 2MASS J05383981-0256462 TT* 05 38 39.8185491423 -02 56 46.235837610   15.98 14.62 13.71 12.76 K7.5 19 0
16 Haro 5-13 TT* 05 38 40.2734966736 -02 30 18.558554472 17.937 16.91 15.49 14.48 13.46 M0e 41 0
17 UCAC2 30800097 TT* 05 38 41.2928547432 -02 37 22.626301404 16.93 15.86 14.54 14.192 12.78 M0.0 34 0
18 NAME sig Ori Cluster OpC 05 38 42 -02 36.0           ~ 623 0
19 UCAC2 30800102 TT* 05 38 42.2801182536 -02 37 14.821687344 17.36 16.69 15.27 14.27 13.22 M0.5 37 0
20 2MASS J05384386-0237068 TT* 05 38 43.8691779528 -02 37 06.911503896 13.559   17.93 16.59 14.80 M5.5 38 0
21 [W96] 4771-1051 TT* 05 38 44.2345372944 -02 40 19.771649184 15.88 15.24 14.02 13.22 12.41 K7.5/8e 42 0
22 V* V595 Ori TT* 05 38 45.37536 -02 41 59.4240 17.75 17.08 15.61 15.19 13.45 M1.5 29 0
23 [W96] pJ053847-0234 TT* 05 38 47.1886997424 -02 34 36.917448204 17.17 18.43 17.36 16.38 14.81 M4.0 25 0
24 UCAC4 438-011202 TT* 05 38 47.4634997136 -02 35 25.322448264 12.01 14.96 14.82 15.071 13.10 M0.5 26 0
25 [W96] rJ053847-0237 TT* 05 38 47.91648 -02 37 19.2360 16.81 16.78 15.51 15.01 13.39 M1.0 29 0
26 [W96] 4771-899 TT* 05 38 48.0364463496 -02 27 14.149731420 16.327 14.490 13.254 12.630 11.54 K7e 33 0
27 V* V2737 Ori Or* 05 38 49.2830405880 -02 23 57.624853740 22.321 23.90 19.39 17.67 16.90 M3.8V 27 0
28 2MASS J05385060-0242429 Or* 05 38 50.6088010368 -02 42 42.960276072   21.04 19.42 17.80 15.85 ~ 24 0
29 V* RU Ori TT* 05 38 52.0091406720 -02 46 43.719992436     14.27 13.44 12.72 K7.5 44 0
30 UCAC4 437-010938 TT* 05 39 04.5914072832 -02 41 49.316692020 17.20 17.44 16.39 15.51 14.53 M0.0 18 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 37 0
32 2MASS J05390878-0231115 TT* 05 39 08.7813079488 -02 31 11.585111808 18.78 19.27 18.11 16.82 15.30 M3.0 33 0
33 Haro 5-20 TT* 05 39 11.5179186744 -02 31 06.580001460 18.295 16.98 15.45 14.56 13.56 M0.0 43 0
34 Haro 5-21 TT* 05 39 18.8360108640 -02 30 53.221941684 17.563 15.88 14.41 13.49 12.60 K7.0 41 0
35 Haro 5-25 TT* 05 39 39.3780952152 -02 17 04.499525544   16.95 15.35 14.29 13.24 M0.0 42 0
36 2MASS J05394097-0216243 TT* 05 39 40.9755243240 -02 16 24.373435296   19.37 18.01 16.54 14.75 M6 22 0
37 2MASS J05394944-0223459 Y*O 05 39 49.4438049576 -02 23 45.965751396   20.21 18.15 16.86 15.12 M4e 24 0
38 Haro 5-30 TT* 05 39 51.7265730336 -02 22 47.261235504   19.33 17.95 16.40 14.64 M5.5e 37 0
39 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0
40 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
41 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
42 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1

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