2017A&A...604A.127M


Query : 2017A&A...604A.127M

2017A&A...604A.127M - Astronomy and Astrophysics, volume 604A, 127-127 (2017/8-1)

X-shooter study of accretion in Chamaeleon I. II. A steeper increase of accretion with stellar mass for very low-mass stars?

MANARA C.F., TESTI L., HERCZEG G.J., PASCUCCI I., ALCALA J.M., NATTA A., ANTONIUCCI S., FEDELE D., MULDERS G.D., HENNING T., MOHANTY S., PRUSTI T. and RIGLIACO E.

Abstract (from CDS):

The dependence of the mass accretion rate on the stellar properties is a key constraint for star formation and disk evolution studies. Here we present a study of a sample of stars in the Chamaeleon I star-forming region carried out using spectra taken with the ESO VLT/X-shooter spectrograph. The sample is nearly complete down to stellar masses (M*)∼0.1M for the young stars still harboring a disk in this region. We derive the stellar and accretion parameters using a self-consistent method to fit the broadband flux-calibrated medium resolution spectrum. The correlation between accretion luminosity to stellar luminosity, and of mass accretion rate to stellar mass in the logarithmic plane yields slopes of 1.9±0.1 and 2.3±0.3, respectively. These slopes and the accretion rates are consistent with previous results in various star-forming regions and with different theoretical frameworks. However, we find that a broken power-law fit, with a steeper slope for stellar luminosity lower than ∼0.45L and for stellar masses lower than ∼0.3M is slightly preferred according to different statistical tests, but the single power-law model is not excluded. The steeper relation for lower mass stars can be interpreted as a faster evolution in the past for accretion in disks around these objects, or as different accretion regimes in different stellar mass ranges. Finally, we find two regions on the mass accretion versus stellar mass plane that are empty of objects: one region at high mass accretion rates and low stellar masses, which is related to the steeper dependence of the two parameters we derived. The second region is located just above the observational limits imposed by chromospheric emission, at M*∼0.3-0.4M. These are typical masses where photoevaporation is known to be effective. The mass accretion rates of this region are ∼10–10M/yr, which is compatible with the value expected for photoevaporation to rapidly dissipate the inner disk.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be - accretion, accretion disks - protoplanetary disks - open clusters and associations: individual: Chamaeleon I - open clusters and associations: individual: Chamaeleon I

CDS comments: ISO-ChaI 127 not in SIMBAD.

Simbad objects: 108

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Number of rows : 108
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 2MASS J03283450+3100510 Y*O 03 28 34.501 +31 00 51.01           ~ 71 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3923 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2136 1
4 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 522 0
5 LDN 1641 MoC 05 39.0 -07 00           ~ 456 0
6 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1683 0
7 2MASS J10533978-7712338 TT* 10 53 39.7627565760 -77 12 33.939774612     19.38   15.56 M2.75 17 0
8 V* SX Cha B Y*O 10 55 59.1604276944 -77 24 39.464557920           M3 9 0
9 V* SX Cha Or* 10 55 59.802000 -77 24 40.12524   16.01 14.57 14.23 12.35 M1.5+M3 84 0
10 2MASS J10561638-7630530 Y*O 10 56 16.3768137936 -76 30 53.122626108         14.92 M5.6 16 0
11 V* SY Cha Or* 10 56 30.3883129248 -77 11 39.401977596         11.29 K5Ve 118 0
12 Sz 4 TT* 10 57 42.0977196408 -76 59 35.641299948   14.1 14.80   12.17 M4Ve 42 0
13 2MASS J10580597-7711501 Y*O 10 58 05.9730159264 -77 11 50.171141904         15.89 M5.25 17 0
14 V* SZ Cha Or* 10 58 16.7500775160 -77 17 17.185749900     12.68   10.62 K0e 112 0
15 V* TW Cha Or* 10 59 01.0607352312 -77 22 40.947126636     13.40   11.68 K8Ve 121 0
16 Hen 3-545 Or* 10 59 06.9715593000 -77 01 40.309233240   12.91 11.136   9.596 K4Ve 199 0
17 Ass Cha T 1-6 Y*O 11 00 40.2418846200 -76 19 28.006915296   14.7     13.64 M4e 37 0
18 V* CS Cha Or* 11 02 24.8763629208 -77 33 35.667131796   12.88 11.69   10.123 K2Ve 210 0
19 Hn 1 Y*O 11 02 32.6050296696 -77 29 13.031436624         13.10 M3+M5 39 0
20 Ass Cha T 1-8 TT* 11 02 55.0255671144 -77 21 50.814186624     16.25 15.17 13.40 M4.5e 51 0
21 CHSM 1715 Y*O 11 04 04.2481004976 -76 39 32.945559912     19.84     M4.5e 22 0
22 V* CT Cha Or* 11 04 09.0989256840 -76 27 19.329779664   13.44 13.00   10.89 K7Ve 118 0
23 BYB 18 Y*O 11 04 42.5993270304 -77 41 57.167040408         13.63 M4.5e 52 0
24 Sz 13 Or* 11 04 57.0089116656 -77 15 57.049656948     18.91 16.65 14.68 M3e 38 0
25 2MASS J11062554-7633418 Y*O 11 06 25.5205540968 -76 33 41.844743964     20.7   15.88 M5.25-6 31 0
26 2MASS J11062942-7724586 Y*? 11 06 29.426 -77 24 58.64           M6 12 0
27 CHSM 7869 LM* 11 06 32.7605799336 -76 25 21.066840084         16.83 M6e 18 0
28 ISO-ChaI 79 Y*O 11 06 39.4531299120 -77 36 05.253418332         17.83 M5e 24 0
29 Hn 5 Or* 11 06 41.7902217936 -76 35 49.067303964         13.61 M4.5e 39 0
30 V* UX Cha Or* 11 06 45.0944158128 -77 27 02.383275420     14.78   12.07 K5Ve 54 0
31 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1060 1
32 V* UY Cha Or* 11 06 59.0257686696 -77 18 53.404488720         12.97 M4Ve 56 0
33 2MASS J11065939-7530559 Y*O 11 06 59.4109563336 -75 30 55.959455556         15.79 M5.25 14 0
34 [CCE98] 2-21 Y*O 11 07 09.25152 -77 18 47.1420           M2.5 23 0
35 CHSM 9484 Y*? 11 07 11.8067087880 -76 25 50.015887680         16.07 M5e 20 0
36 V* UZ Cha Or* 11 07 12.0595557432 -76 32 23.248659588         12.62 K8Ve 50 0
37 [CCE98] 1-46 Y*O 11 07 13.2923530152 -77 43 49.768078224         14.77 M3.5e 40 0
38 [NC98] Cha HA 1 Y*O 11 07 16.6710048312 -77 35 53.212777692   22.8 21.0   16.38 M7.5/8e 83 0
39 [NC98] Cha HA 9 BD* 11 07 18.5760916584 -77 32 51.561674700     23.1   17.57 M5.5e 48 0
40 Ass Cha T 1-12 Y*O 11 07 19.1444866104 -76 03 04.864188060   17.05 15.35   12.57 M4Ve 64 0
41 V* DI Cha Or* 11 07 20.7276076008 -77 38 07.308086352   12.02 10.74 10.72   G2Ve 157 0
42 V* VV Cha Or* 11 07 28.241088 -76 52 11.92620   16.00 14.72 14.48 12.19 M1.5+M3 62 0
43 V* HK Cha Or* 11 07 42.3364909752 -77 33 59.394350844   21.9 19.8   15.26 ~ 76 0
44 Ass Cha T 1-15 Or* 11 07 43.6610412264 -77 39 41.134236408   17.05 15.34   12.67 K5Ve 68 0
45 2MASS J11074656-7615174 Y*O 11 07 46.5862114680 -76 15 17.398121508         16.84 M5.75e 27 0
46 V* HM Cha Or* 11 07 57.2800691640 -77 17 26.241455868       20.9 17.14 M0.75-M1.75 35 0
47 Ass Cha T 1-16 Or* 11 07 57.9428053584 -77 38 44.977882344   15.1 14.2   13.04 K4-7 63 0
48 Sz 23 Or* 11 07 58.0951794888 -77 42 41.352365124   15.8 18.04   14.63 M4Ve 59 0
49 CHXR 30A Y*O 11 07 59.9497969992 -77 17 30.576549264   21.8   18.3 15.78 K8 25 0
50 V* VW Cha Or* 11 08 01.3974165580 -77 42 28.579297348 13.91 14.04 12.80   10.69 K7+M0 172 0
51 ESO-HA 562 Or* 11 08 02.8789169712 -77 38 42.580139640     17.61   14.41 M0.5+M0.5 42 0
52 V* HP Cha B * 11 08 14.7682489051 -77 33 52.732866898           G5e 15 0
53 V* HP Cha Or* 11 08 15.216432 -77 33 53.17020   14.33 12.77 12.11   K3+G5e 102 0
54 ISO-ChaI 138 LM* 11 08 18.4691867664 -77 30 40.891618332         16.77 ~ 36 0
55 ISO-ChaI 143 Y*? 11 08 22.3647237024 -77 30 27.783619596         15.51 M5e 40 0
56 2MASS J11082570-7716396 Y*O 11 08 25.70520 -77 16 39.6192       23.46 20.75 M8 12 0
57 ISO-ChaI 147 Y*? 11 08 26.4697073400 -77 15 55.074237156         16.81 M5.75 23 0
58 Ass Cha T 1-20 Or* 11 08 39.0261275112 -77 16 04.163889324   18.44 16.28 15.822 13.17 K5Ve 77 0
59 V* HQ Cha Or* 11 08 39.5017287912 -77 34 16.733892756   21.7 19.75   15.06 ~ 61 0
60 Sz 28 Y*O 11 08 50.9098459272 -76 25 13.681141392   16.4     14.60 M4Ve 32 0
61 V* PU Car TT* 11 08 53.6905436304 -75 21 36.001367136   15.487 14.275 14.560   M1Ve 24 0
62 V* VY Cha Or* 11 08 54.6059374368 -77 02 13.006464720   14.8     13.60 K8Ve 64 0
63 V* HS Cha Or* 11 08 54.9599362056 -76 32 41.148693636     20.12 18.616 16.650 M5.5e 31 0
64 V* HU Cha Or* 11 09 18.12888 -76 30 29.2500         14.99 M1/2e 48 0
65 V* HV Cha Or* 11 09 22.6489972128 -76 34 32.164757616         16.79 M0.75-M1.75 49 0
66 V* VZ Cha Or* 11 09 23.7739008528 -76 23 20.857480836   13.82 12.94   12.14 K7e 131 0
67 HJM C 1-24 TT* 11 09 46.1881553592 -76 34 46.503994080   11.93 18.41   14.72 M3.25e 53 1
68 BYB 43 Y*O 11 09 47.3883040248 -77 26 29.187831192         16.62 M3.25e 45 0
69 ISO-ChaI 217 Y*O 11 09 52.1372780448 -76 39 12.876642648         16.63 ~ 43 0
70 ISO-ChaI 220 Y*O 11 09 53.3244652320 -77 28 36.603732468           M5.75 26 0
71 Ass Cha T 1-23 Or* 11 09 53.4189070920 -76 34 25.652641116   13.9 19.50 15.10 13.52 G9IIIe 82 0
72 V* HX Cha Or* 11 09 54.062760 -76 29 25.54332       16.08 14.03 M3.5+M7 62 0
73 V* WX Cha Or* 11 09 58.666944 -77 37 09.03432   14.93 13.85 14.23 12.20 M1+M5 92 0
74 V* WW Cha Or* 11 10 00.0802739160 -76 34 57.963853416   14.74 14.10   10.95 ~ 139 0
75 HJM C 1-4 Y*O 11 10 03.6830951520 -76 33 29.218685616     18.78 16.1 14.72 K8e 53 0
76 V* FN Cha Or* 11 10 04.6714603680 -76 35 45.253161564     14.68 13.89 12.39 K5Ve 49 0
77 V* WY Cha Or* 11 10 07.0339153464 -76 29 37.674167388   15.29 13.87   11.62 K8Ve 80 1
78 2MASS J11100785-7727480 Y*? 11 10 07.8396430440 -77 27 48.063966876         17.79 M5.5 29 0
79 HJM C 1-8 Y*O 11 10 11.3918141448 -76 35 29.247545184         13.75 K5Ve 50 0
80 Glass Q Y*O 11 10 37.8987149352 -77 32 39.881630256   16.89 14.97   11.90 K5.5+K7 67 0
81 ISO-ChaI 252 Y*? 11 10 41.3874327240 -77 20 47.961251340     22.4 20.06 17.27 ~ 32 0
82 Ass Cha T 1-27 Or* 11 10 49.5667074984 -77 17 51.754670016   16.80 16.64   13.84 M4Ve 72 0
83 V* WZ Cha Or* 11 10 53.3212598040 -76 34 32.057703048   16.41 15.48   13.07 M4Ve 62 0
84 V* IK Cha Or* 11 10 53.5796812512 -77 25 00.472704888         17.51 M4.5 28 0
85 HJM C 2-5 Y*O 11 10 55.9782007344 -76 45 32.646407688         13.95 M6e 43 0
86 ESO-HA 569 Y*O 11 11 10.6899611256 -76 41 57.345117072     20.28   17.34 M2.5 26 0
87 V* XX Cha Or* 11 11 39.6728641032 -76 20 15.032221548   16.67 15.28   12.56 M3Ve 99 1
88 CHX 18N TT* 11 11 46.3370290776 -76 20 08.948823324   13.27 11.96   10.37 K5IVe 65 1
89 V* IM Cha Or* 11 12 03.5025776424 -77 26 00.841371900     20.08     M4.75 29 0
90 Sz 40 Or* 11 12 09.8312703024 -76 34 36.490702728   15.2     13.41 M4.5Ve 52 0
91 Sz 41 TT* 11 12 24.3973943352 -76 37 06.181395384   11.2 11.60   10.22 K7+M2.5 92 1
92 HJM E 1-9b Ro* 11 12 27.4051234056 -76 37 01.565008860     11.137 11.99 10.72 K0III 9 1
93 V* CV Cha Or* 11 12 27.7055693328 -76 44 22.302807396   12.02 10.98 10.51 9.76 G9Ve 183 1
94 V* CW Cha Or* 11 12 30.9285677040 -76 44 24.000940464   15.75 14.45 15.19 13.60 ~ 56 1
95 Ass Cha T 2-54 TT* 11 12 42.6709132056 -77 22 22.943489160     11.103   9.653 G8+K7 81 2
96 HJM E 2-9 Y*O 11 12 48.6110100768 -76 47 06.614161764         13.66 M4e 27 0
97 Hn 18 Y*O 11 13 24.4522663344 -76 29 22.868165508         13.51 M4Ve 36 0
98 Hn 21W Y*O 11 14 24.5192431416 -77 33 06.402087756     18.20   14.24 M4e 29 0
99 2MASS J11160287-7624533 Y*O 11 16 02.8655829624 -76 24 53.197151184     19.60   17.25 K7-M0 22 0
100 Ass Cha T 1-32 Y*O 11 17 36.9756803040 -77 04 38.123504472   13.1 13.50   11.78 M0.5e 77 0
101 UCAC3 28-29527 Y*O 11 17 52.11672 -76 29 39.2640       15.54 13.39 M4.5 9 0
102 IRAS F11171-7919 Y*O 11 18 35.821080 -79 35 54.93624   16.49 15.06 14.99 12.22 M4.75 19 0
103 2MASS J11241186-7630425 Y*O 11 24 11.8643530704 -76 30 42.679500732         14.87 M5 16 0
104 [FLG2003] eps Cha 17 Y*O 11 43 26.6961432072 -78 04 45.492325392         13.33 M5 18 0
105 Ass Cha T 2 As* 13 00 50.7 -77 34 26           ~ 19 1
106 NAME Lupus Complex SFR 16 03 -38.1           ~ 606 0
107 THA 15-40 TT* 16 10 12.1994252424 -39 21 17.990363016   15.70 14.06 13.88 11.84 ~ 27 0
108 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3337 1

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2022.05.25-09:13:52

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