2015A&A...579A..66M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:14:35

2015A&A...579A..66M - Astronomy and Astrophysics, volume 579A, 66-66 (2015/7-1)

X-Shooter study of accretion in ρ-Ophiucus: very low-mass stars and brown dwarfs.

MANARA C.F., TESTI L., NATTA A. and ALCALA J.M.

Abstract (from CDS):

We present new VLT/X-Shooter optical and near-infrared spectra of a sample of 17 candidate young low-mass stars and brown dwarfs located in the ρ-Ophiucus cluster. We derived the spectral type and extinction for all the targets, and then we determined their physical parameters. All the objects but one have M*≲0.6M, and eight have mass below or close to the hydrogen-burning limit. Using the intensity of various permitted emission lines present in their spectra, we determined the accretion luminosity and mass accretion rates ({dot}(M)acc) for all the objects. When compared with previous works targeting the same sample, we find that, in general, these objects are not as strongly accreting as previously reported, and we suggest that the reason is our more accurate estimate of the photospheric parameters. We also compare our findings with recent works in other slightly older star-forming regions, such as Lupus, to investigate possible differences in the accretion properties, but we find that the accretion properties for our targets have the same dependence on the stellar and substellar parameters as in the other regions. This leads us to conclude that we do not find evidence for a different dependence of {dot}(M)acc with M* when comparing low-mass stars and brown dwarfs. Moreover, we find a similar small (≲1dex) scatter in the {dot}(M)acc-M* relation as in some of our recent works in other star-forming regions, and no significant differences in {dot}(M)acc due to different ages or properties of the regions. The latter result suffers, however, from low statistics and sample selection biases in the current studies. The small scatter in the {dot}(M)acc-M* correlation confirms that mass accretion rate measurements in the literature based on uncertain photospheric parameters and single accretion indicators, such as the Hα width, can lead to a scatter that is unphysically large. Our studies show that only broadband spectroscopic surveys coupled with a detailed analysis of the photospheric and accretion properties allows us to properly study the evolution of disk accretion rates in star-forming regions.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: formation - brown dwarfs - protoplanetary disks - accretion, accretion disks - clusters open and associations: individual: rho-Ophiucus

VizieR on-line data: <Available at CDS (J/A+A/579/A66): tabled1.dat>

Simbad objects: 188

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Number of rows : 188

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3479 0
2 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1977 1
3 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 486 0
4 2MASS J05385492-0228583 Y*O 05 38 54.9294057342 -02 28 58.375274422 21.05 20.21 18.61 17.22 15.48 M4.5 24 0
5 2MASS J05392023-0238258 Y*O 05 39 20.2374400819 -02 38 25.947658082 21.41 20.82 18.97 17.45 15.55 M5.5 18 0
6 V* BX Ant TT* 10 18 28.6989165716 -31 50 02.826261802   13.39 11.454 11.382 9.325 M0Ve 103 0
7 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 151 1
8 NAME Cha I MoC 11 06 48 -77 18.0           ~ 968 1
9 V* V1215 Cen TT* 11 13 26.2208332352 -45 23 42.719174706     12.478   10.483 K8IVe 68 0
10 CD-34 7390B TT* 11 21 17.4429759333 -34 46 49.774537089   13.43 11.96 11.31 9.88 M1Ve 57 0
11 TWA 26 LM* 11 39 51.1435262748 -31 59 21.473337261         15.83 M8e 96 0
12 CD-36 7429A TT* 11 48 24.2226856081 -37 28 49.112368947   12.54 11.17 10.92 9.552 K5V 107 0
13 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 92 0
14 V* V1249 Cen TT* 12 15 30.7203284919 -39 48 42.605543199   13.09 11.160 10.919 9.50 M0.5 83 0
15 V* V1251 Cen TT* 12 34 20.6481566533 -48 15 13.530604360   13.3 12.2   11.90 M3.5 39 0
16 TWA 29 LM* 12 45 14.1609543807 -44 29 07.737190128         18.0 M9.5p 42 0
17 NAME Lupus I Cld 15 43 02.1 -34 09 06           ~ 224 0
18 Sz 94 TT* 16 07 49.5977000657 -39 04 28.760980696   16.31 16.00 14.76 12.90 ~ 27 0
19 2MASS J16083578-3903479 Y*O 16 08 35.7827668528 -39 03 47.934787375   16.88 15.49 15.02 13.09 M6 20 0
20 NAME Lupus III SFR 16 09.6 -39 03           ~ 271 0
21 THA 15-41 TT* 16 10 16.4254785450 -39 08 05.033811326   15.33 13.73 13.28 12.12 M2 28 0
22 YLW 19 Y*O 16 25 36.7376373343 -24 15 42.528646400   17.8 16.4 14.94 13.36 K3-K5 39 0
23 BKLT J162538-242238 Y*O 16 25 38.1274702773 -24 22 36.198931346           M0 23 0
24 IRAS 16226-2420 TT* 16 25 39.5828608249 -24 26 34.889477995       16.78 14.84 M2 36 0
25 WLY 2-10 TT* 16 25 50.5249510923 -24 39 14.568017391     15.49 13.83 12.30 K5.5 34 0
26 EM* SR 4 Or* 16 25 56.1659484606 -24 20 48.239269835     12.80 11.7 10.7 K0:Ve 151 1
27 [SKS95] 162300.0-241834 Y*O 16 26 01.3663365059 -24 25 20.939925891           ~ 20 0
28 VSSG 19 TT* 16 26 03.2984499033 -24 17 46.540322174     16.49 14.86 13.00 M2 31 0
29 BKLT J162604-241753 Y*O 16 26 04.57776 -24 17 51.4824           ~ 15 0
30 BKLT J162607-242725 Y*O 16 26 07.04280 -24 27 24.1848           ~ 20 1
31 BKLT J162607-242742 Y*O 16 26 07.63968 -24 27 41.3676           ~ 18 1
32 EM* SR 3 Y*O 16 26 09.3231207767 -24 34 12.176811236   10.9 9.88   9.01 A0 106 0
33 GSS 26 Y*O 16 26 10.33152 -24 20 54.8232           M0 74 1
34 CRBR 2314.4-1237 Y*O 16 26 15.8181138736 -24 19 22.551055479           ~ 21 1
35 GSS 29 TT* 16 26 16.8584457266 -24 22 23.154122364       17.4 15.23 K5-K6 76 1
36 DoAr 24 TT* 16 26 17.0747576971 -24 20 21.594542024   16.06 14.21 14.02 11.57 K7.5V 100 1
37 CRBR 2317.3-1925 Y*O 16 26 18.82056 -24 26 10.5216           M7 40 0
38 Elia 2-20 TT* 16 26 18.8782824640 -24 28 19.698059817           ~ 93 1
39 CRBR 2317.5-1729 Y*O 16 26 18.98232 -24 24 14.2596           ~ 39 0
40 BKLT J162621-241544 TT* 16 26 21.0288455544 -24 15 41.487346014           ~ 9 0
41 [GY92] 5 Y*O 16 26 21.5389368381 -24 26 01.000528521       18.30 15.80 M7 59 1
42 [GY92] 3 Y*O 16 26 21.9083577172 -24 44 39.720788042       17.95 15.62 M6.5 45 0
43 NAME rho Oph Cluster Cl* 16 26 22 -24 23.7           ~ 49 0
44 [RR90] Oph 2320.8-1721 Y*O 16 26 22.26912 -24 24 07.0632           M8 64 0
45 [GY92] 15 Y*O 16 26 22.95576 -24 28 46.1496           ~ 22 0
46 GSS 31 TT* 16 26 23.3694945462 -24 20 59.580653864   15.9 14.70 14.33 11.53 K0e 133 1
47 [GY92] 21 Y*O 16 26 23.57976 -24 24 39.4956           K7 62 2
48 DoAr 25 TT* 16 26 23.6911216715 -24 43 13.886717283       12.65   K5 128 0
49 GSS 32 TT* 16 26 24.0521249616 -24 24 48.105099750       17.81 15.58 K5-K6 94 1
50 Elia 2-24 TT* 16 26 24.0896068058 -24 16 13.456681632   16.3 14.40 15.81 13.97 K6 126 1
51 [GY92] 29 Y*O 16 26 25.28280 -24 24 45.0072           ~ 23 1
52 [GY92] 33 Y*O 16 26 27.53832 -24 41 53.5272           ~ 22 0
53 BKLT J162628-241543 Y*O 16 26 28.47672 -24 15 41.1660           ~ 10 1
54 VSSG 27 Y*O 16 26 30.46896 -24 22 57.1440           M 57 1
55 YLW 35 Y*O 16 26 31.03680 -24 31 05.2248           ~ 21 1
56 BKLT J162636-241554 Y*O 16 26 36.8346898479 -24 15 51.848175020       17.37 15.67 K7-M1 32 1
57 VSSG 4 Y*O 16 26 37.78680 -24 23 00.7476           ~ 27 0
58 [GY92] 84 Y*O 16 26 38.80368 -24 23 22.7328           M6 20 0
59 WLY 2-16 Y*O 16 26 40.83456 -24 30 50.9508           M5.75 18 0
60 [GY92] 93 TT* 16 26 41.2758774571 -24 40 17.853342857       15.41 13.37 M5 52 0
61 WL 8 Y*O 16 26 42.01776 -24 33 26.2332           ~ 21 0
62 WL 7 Y*O 16 26 42.14328 -24 31 02.9460           ~ 31 0
63 GSS 37 TT* 16 26 42.85416 -24 20 29.8608       16.29 14.08 K7-M2 74 1
64 [GY92] 109 Y*O 16 26 42.89280 -24 22 59.0808           ~ 18 1
65 VSSG 11 TT* 16 26 43.7653879512 -24 16 33.287042569           ~ 45 1
66 VSSG 30 Y*O 16 26 44.19504 -24 34 48.3492           ~ 128 0
67 [GY92] 112 TT* 16 26 44.3013631817 -24 43 14.063146447     17.07 15.15 13.37 M3 31 0
68 GSS 39 Y*O 16 26 45.0321556934 -24 23 07.808781522           M0 142 1
69 YLW 37 TT* 16 26 46.4318675036 -24 12 00.041276484   17.15   13.90 12.37 G3.5 51 0
70 [GY92] 122 Y*O 16 26 47.0549335086 -24 44 29.783806566       17.41 15.19 M4.5 18 0
71 WL 2 Y*O 16 26 48.48624 -24 28 38.9064           ~ 51 1
72 WL 18 TT* 16 26 48.9801383800 -24 38 25.150629987       19.33 17.38 M3.5 62 0
73 VSSG 3 Y*O 16 26 49.2334185887 -24 20 03.409036777           ~ 45 1
74 YLW 1A TT* 16 26 51.1109449971 -24 20 50.752881529           ~ 9 0
75 BBRCG 13 Y*O 16 26 51.97104 -24 30 39.4956           ~ 23 1
76 BBRCG 14 Y*O 16 26 53.46936 -24 32 36.2472           ~ 23 1
77 VSSG 5 Y*O 16 26 54.44376 -24 26 20.7204           ~ 40 1
78 [GY92] 154 Y*O 16 26 54.77088 -24 27 02.2464           ~ 22 0
79 BKLT J162656-241353 TT* 16 26 56.7840840242 -24 13 51.542985458       18.46 16.29 K7 24 0
80 BBRCG 16 TT* 16 26 56.91984 -24 28 37.0740           M2.5 16 0
81 WL 21 TT* 16 26 57.33000 -24 35 38.8032           ~ 40 0
82 YLW 1C Y*O 16 26 58.39608 -24 21 29.9808           ~ 31 1
83 Haro 1-7 ** 16 26 58.53 -24 45 35.3           K2:e+M0.5e 95 0
84 BKLT J162658-241836 Y*O 16 26 58.63896 -24 18 34.6644           M4.5 22 1
85 WL 14 Y*O 16 26 59.04984 -24 35 56.8788           ~ 50 0
86 VSSG 8 TT* 16 27 01.61856 -24 21 37.0404           ~ 16 0
87 WL 16 Y*O 16 27 02.33520 -24 37 27.2316           A0-F3 153 0
88 [GY92] 188 Y*O 16 27 03.00720 -24 26 14.6976           ~ 24 1
89 BKLT J162703-242007 Y*O 16 27 03.59088 -24 20 05.4456           M1.5 16 0
90 VSSG 31 Y*O 16 27 04.10688 -24 28 29.9136           ~ 56 1
91 [GY92] 193 Y*O 16 27 04.5152139620 -24 42 59.673480203       16.69 14.97 K6-M1 28 0
92 [GY92] 194 Y*O 16 27 04.5600221372 -24 42 14.018532542       17.54 15.66 K8-M0 26 0
93 [GY92] 195 Y*O 16 27 04.57464 -24 27 15.6636           ~ 29 1
94 BKLT J162705-244013 Y*O 16 27 05.67576 -24 40 13.0908           ~ 16 0
95 [GY92] 204 Y*O 16 27 06.5924723987 -24 41 48.883697790       17.57 15.43 M5 81 0
96 WL 17 Y*O 16 27 06.77616 -24 38 14.9964           ~ 84 0
97 [GY92] 207 TT* 16 27 07.95504 -24 40 29.1396           ~ 6 0
98 BKLT J162708-241204 TT* 16 27 09.0793489219 -24 12 00.812757039       18.47 16.14 M2.5 23 0
99 WL 10 Y*O 16 27 09.1086301538 -24 34 08.290873154           K9 63 0
100 [GY92] 213 Y*O 16 27 09.35328 -24 40 22.4292           ~ 28 0
101 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 267 1
102 BBRCG 25 Y*O 16 27 09.72456 -24 29 55.5648           ~ 10 0
103 EM* SR 21A TT* 16 27 10.2776332501 -24 19 12.620553212   16.08 14.10     G1 233 1
104 WL 9 Y*O 16 27 10.34664 -24 33 22.6692           ~ 23 0
105 WLY 1-43 Y*O 16 27 11.17992 -24 40 46.6680           ~ 54 0
106 WLY 2-32 Y*O 16 27 11.68224 -24 23 41.9748           ~ 19 0
107 WL 19 Y*O 16 27 11.71416 -24 38 32.0604           ~ 66 0
108 WL 11 Y*O 16 27 12.13128 -24 34 49.1412           M2 42 0
109 VSSG 24 Y*O 16 27 13.7333005776 -24 18 16.861146661           ~ 31 1
110 [GY92] 235 Y*O 16 27 13.8208549477 -24 43 31.648188013           M3.5 36 0
111 WLY 2-33 Y*O 16 27 14.50512 -24 26 46.0860           ~ 30 0
112 YLW 10B Y*O 16 27 15.45432 -24 26 39.8004           ~ 45 0
113 WLY 2-35 Y*O 16 27 15.51408 -24 30 53.6832           ~ 29 0
114 WL 20 Y*O 16 27 15.69840 -24 38 43.4364           ~ 78 0
115 YLW 10C Y*O 16 27 15.88488 -24 25 14.1924           ~ 24 0
116 YLW 12A Y*O 16 27 17.57160 -24 28 56.2944           ~ 64 0
117 ISO-Oph 123 TT* 16 27 17.5868213480 -24 05 13.700107573   20.3 18.9 17.67 15.47 M3.5 11 0
118 WL 5 TT* 16 27 18.17064 -24 28 52.6800           ~ 88 0
119 [GY92] 248 Y*? 16 27 18.37560 -24 24 26.3124           ~ 12 0
120 BBRCG 39 Y*O 16 27 18.38040 -24 39 14.6844           ~ 36 0
121 VSSG 26 Y*O 16 27 18.48720 -24 29 05.9136           ~ 83 0
122 WL 3 Y*O 16 27 19.21584 -24 28 43.8528           K7 60 0
123 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 166 1
124 YLW 13B Y*O 16 27 21.46872 -24 41 43.0692           ~ 86 0
125 WL 6 Y*O 16 27 21.80448 -24 29 53.3616           ~ 111 0
126 [GY92] 253 Y*O 16 27 21.83064 -24 43 35.6952           M3 28 0
127 VSSG 22 Y*O 16 27 22.9143048814 -24 17 57.430600647           ~ 35 1
128 [GY92] 258 TT* 16 27 24.39000 -24 41 47.5620           ~ 23 0
129 BKLT J162726-241925 Y*O 16 27 26.22336 -24 19 22.9980           M7.75 26 0
130 [GY92] 260 Y*O 16 27 26.28552 -24 42 46.1304           ~ 23 0
131 YLW 16C Y*O 16 27 26.48952 -24 39 23.0760           M1 56 0
132 YLW 15 Y*O 16 27 26.93640 -24 40 50.8224           ~ 240 1
133 Elia 2-31 TT* 16 27 27.3790999869 -24 31 16.473626072           ~ 64 1
134 YLW 16A Y*O 16 27 28.02744 -24 39 33.5052           K8 185 0
135 Elia 2-32 Y*O 16 27 28.44576 -24 27 21.0348           K6.5 104 1
136 YLW 16B Y*O 16 27 29.43528 -24 39 16.1892           ~ 102 0
137 BBRCG 53 Y*O 16 27 29.96424 -24 33 36.5688           ~ 19 0
138 Elia 2-33 Y*O 16 27 30.18024 -24 27 43.3656           M2 108 1
139 BKLT J162730-244726 Y*O 16 27 30.8381007993 -24 47 26.799406990       18.32 16.17 M1-M2 22 0
140 [GY92] 284 TT* 16 27 30.8462751800 -24 24 56.099392437       18.45 16.24 M3.25 40 0
141 BBRCG 56 Y*O 16 27 31.0584837384 -24 34 03.264280761           ~ 18 0
142 BBRCG 60 Y*O 16 27 32.67576 -24 33 23.9328           ~ 31 0
143 BBRCG 59 Y*O 16 27 32.71056 -24 32 42.3636           ~ 13 0
144 BBRCG 61 Y*O 16 27 32.85048 -24 32 34.8324           ~ 30 0
145 YLW 18 TT* 16 27 33.1158717225 -24 41 15.261194836       17.66 15.65 K5-K6 63 0
146 [GY92] 295 TT* 16 27 35.2624006505 -24 38 33.439591125       16.16 14.08 M4.5 33 0
147 [GY92] 296 Y*O 16 27 35.6623113458 -24 45 32.524940178           ~ 12 0
148 [GY92] 297 Y*O 16 27 36.5263098744 -24 28 33.333096307       14.67 13.30 M2 12 0
149 IRAS 16245-2423 TT* 16 27 37.1911764648 -24 30 35.031583716       16.66 14.67 B5-F2 235 0
150 [GY92] 301 Y*O 16 27 37.24944 -24 42 38.0160           ~ 32 0
151 BKLT J162737-241756 Y*O 16 27 37.4272403427 -24 17 54.955552302           M7.5 25 0
152 YLW 47 TT* 16 27 38.3220493264 -24 36 58.601739078       17.69 15.52 M0 85 0
153 [GY92] 310 Y*O 16 27 38.6280925403 -24 38 39.230714152         17.40 M8 60 0
154 [GY92] 312 Y*O 16 27 38.94456 -24 40 20.6724           M2.5 38 0
155 ROX 27 TT* 16 27 39.4297106587 -24 39 15.527875310       15.76 14.03 M0+M4 92 0
156 YLW 45 Y*O 16 27 39.82824 -24 43 15.0672           ~ 107 0
157 EM* SR 9 Or* 16 27 40.2858402419 -24 22 04.132012501   12.91 11.533 11.11 10.00 K5e 249 0
158 [GY92] 322 Y*O 16 27 41.49432 -24 35 37.6656           ~ 17 0
159 BKLT J162741-244645 Y*O 16 27 41.61024 -24 46 44.7420           ~ 17 0
160 [GY92] 323 Y*O 16 27 41.75280 -24 43 36.0984           ~ 19 0
161 [GY92] 326 TT* 16 27 42.7019471651 -24 38 50.620859523         17.30 M2 38 0
162 WLY 2-53 TT* 16 27 43.78392 -24 43 08.0544           ~ 13 0
163 [GY92] 344 Y*O 16 27 45.78672 -24 44 53.8620           ~ 27 0
164 [GY92] 346 Y*O 16 27 45.96504 -24 38 00.5712           ~ 6 0
165 [GY92] 350 Y*O 16 27 46.2918321741 -24 31 41.264641200           M7.5 35 0
166 [GY92] 352 Y*O 16 27 47.09496 -24 45 35.0676           ~ 21 0
167 [GY92] 371 Y*O 16 27 49.7891400099 -24 25 21.930904732           ~ 28 0
168 Elia 2-36 TT* 16 27 49.8769818907 -24 25 40.237798866       13.69 12.19 A7 65 0
169 [GY92] 370 TT* 16 27 49.9689327461 -24 44 16.965777286           ~ 9 0
170 [GY92] 373 Y*O 16 27 50.5056409985 -24 39 03.080366706           ~ 7 0
171 YLW 52 Y*O 16 27 51.80472 -24 31 45.5304           ~ 61 0
172 [GY92] 377 Y*O 16 27 51.8959543237 -24 46 30.005519039           ~ 14 0
173 WLY 2-55 TT* 16 27 52.0863419872 -24 40 50.713643148     16.28 14.48 12.78 K7.5 79 0
174 [GY92] 397 Y*O 16 27 55.25496 -24 28 39.5580           ~ 24 0
175 EM* SR 10 Or* 16 27 55.5811105202 -24 26 18.029286663   15.23 14.19 13.91 11.95 M1.5e 71 0
176 [GY92] 398 Y*O 16 27 55.65360 -24 44 50.9028           ~ 9 0
177 [GY92] 410 Y*O 16 27 57.8269306810 -24 40 01.767684808           K7 26 0
178 [GY92] 412 TT* 16 27 57.87480 -24 36 02.2140           ~ 7 0
179 [GY92] 450 Y*O 16 28 03.55560 -24 34 38.6148           ~ 14 0
180 [GY92] 463 TT* 16 28 04.64592 -24 34 56.0964           ~ 16 0
181 [GY92] 472 TT* 16 28 05.77704 -24 33 54.9900           ~ 8 0
182 BKLT J162812-241138 Y*O 16 28 12.7237256177 -24 11 35.723756180           M6 26 0
183 BKLT J162813-243249 Y*O 16 28 13.7949064127 -24 32 49.482325454       18.08 15.72 M3-M4.5 19 0
184 YLW 58 TT* 16 28 16.5131631203 -24 36 58.057875801   18.5   16.55 14.46 M4 83 0
185 ISO-Oph 195 TT* 16 28 16.7367246915 -24 05 14.439072530       15.59 13.91 K5-K6 31 0
186 BKLT J162821-244246 Y*O 16 28 21.70584 -24 42 47.1276           ~ 11 0
187 EM* SR 20 Or* 16 28 32.6877046986 -24 22 45.009576300   16.23   12.59   G7 74 0
188 EM* SR 13 Or* 16 28 45.2753496511 -24 28 18.830243306     13.60 12.40 10.9 M2e 120 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:14:35

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