2011ApJ...736..137S

Query : 2011ApJ...736..137S

2011ApJ...736..137S - Astrophys. J., 736, 137 (2011/August-1)

Protostars and stars in the coronet cluster: age, evolution, and cluster structure.

SICILIA-AGUILAR A., HENNING T., KAINULAINEN J. and ROCCATAGLIATA V.

Abstract (from CDS):

We present new optical spectroscopy with the FLAMES spectrograph at the Very Large Telescope (VLT), near-IR imaging with VLT/HAWK-I, and 870 µm mapping with APEX/LABOCA of the Coronet cluster. The optical data allow us to estimate spectral types, extinction, and the presence of accretion in 6 more M-type members, in addition to the 12 that we had previously studied. The submillimeter maps and near-IR data reveal the presence of nebular structures and high extinction regions, which are in some cases associated to known IR, optical, and X-ray sources. Most star formation is associated to two elongated structures crossing in the central part of the cluster. Placing all the 18 objects with known spectral types and extinction in an H-R diagram suggests that the cluster is younger than previously thought (<2 Myr, and probably ∼0.5-1 Myr). The new age estimate is in agreement with the evolutionary status of the various protostars in the region and with its compactness (<1.3 pc across), but results in a conflict with the low disk and accretion fraction (only 50%-65% of low-mass stars appear to have protoplanetary disks, and most transitional and homologously depleted disks are consistent with no accretion) and with the evolutionary features observed in the mid-IR spectra and spectral energy distributions of the disks.

Abstract Copyright: ∼

Journal keyword(s): protoplanetary disks - stars: formation - stars: late-type - stars: pre-main sequence

Nomenclature: Fig. 4, Table 3: [SHK2011b] NN N=18 among (Nos 1-27).

Simbad objects: 79

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Number of rows : 79
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 Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
3 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
4 BD+43 2388 PM* 14 11 12.6418965192 +43 06 23.961297672       9.654   K5V 21 0
5 2MASS J19004455-3702108 Y*O 19 00 44.5539857712 -37 02 10.826549412           M3 18 0
6 [SHK2011b] 8 smm 19 00 55.4 -36 55 27           ~ 1 0
7 2MASS J19005974-3647109 Or* 19 00 59.7440317608 -36 47 11.070032568           M5.25 20 0
8 2MASS J19010460-3701292 Y*O 19 01 04.6080393960 -37 01 29.284737816           M4 16 0
9 [SHK2011b] 17 smm 19 01 05.3 -36 54 14           ~ 1 0
10 [CKR2003] MMS 3 mm 19 01 06.6 -36 54 25           ~ 3 0
11 [SHJ2008] G-119 * 19 01 07.90 -36 51 21.0           ~ 1 0
12 V* S CrA Or* 19 01 08.597088 -36 57 19.89504   11.76 10.91 11.41   G0Ve+K0Ve 286 0
13 [CKR2003] MMS 4 mm 19 01 09.0 -36 54 18           ~ 2 0
14 2MASS J19011169-3722213 Y*O 19 01 11.6255734968 -37 22 21.163352376           M4.75V 11 0
15 [SHK2011b] 18 smm 19 01 13.7 -36 54 23           ~ 1 0
16 [CKR2003] MMS 5 mm 19 01 14.6 -36 54 02           ~ 2 0
17 [SHJ2008] G-116 * 19 01 15.40 -36 52 36.0           ~ 1 0
18 V* V667 CrA Or* 19 01 16.2871007376 -36 56 28.277849904           M5 28 0
19 2MASS J19011893-3658282 Y*O 19 01 18.9402669744 -36 58 28.245913644       18.4   M4.5 26 0
20 2MASS J19012083-3703027 Y*O 19 01 20.8420768896 -37 03 02.766814272           M5 21 0
21 2MASS J19012562-3704535 Y*O 19 01 25.6336969968 -37 04 53.583994740           M5.5 17 0
22 GSC 07421-02198 Y*O 19 01 28.7317755864 -36 59 31.793030484         13.15 M1.0 20 0
23 2MASS J19012901-3701484 Y*O 19 01 29.0328872976 -37 01 48.513865908           M3.75 27 0
24 [SHJ2008] G-90 * 19 01 31.4 -36 52 53           ~ 1 0
25 [SHJ2008] G-88 * 19 01 32.2 -36 51 20           ~ 1 0
26 2MASS J19013232-3658030 Y*O 19 01 32.3360615568 -36 58 03.485079948           M4 27 0
27 JCMTSF J190133.9-365334 mm 19 01 33.2 -36 53 35           ~ 6 0
28 2MASS J19013385-3657448 Y*O 19 01 33.8699665872 -36 57 45.328545972           M3 27 0
29 [SHJ2008] G-80 * 19 01 35.7 -37 02 32           ~ 3 0
30 [CKR2003] MMS 7 mm 19 01 38.1 -36 54 03           ~ 4 0
31 HD 176386 Or* 19 01 38.9318002416 -36 53 26.561166432 7.28 7.44 7.32 8.11   B9Vbs 149 0
32 HD 176386B Y*O 19 01 39.1617674928 -36 53 29.571918828           K7: 27 0
33 [SHK2011b] 5 smm 19 01 39.5 -36 53 29           ~ 1 0
34 2MASS J19014041-3651422 Y*O 19 01 40.4193504864 -36 51 42.358652244           M3 23 0
35 [TS84] IRS 2 Y*O 19 01 41.569 -36 58 31.23           K2 97 0
36 [SHK2011b] 2 smm 19 01 42.5 -36 58 39           ~ 1 0
37 [CKR2003] MMS 10 mm 19 01 45.9 -36 55 48           ~ 5 0
38 JCMTSF J190146.0-365627 mm 19 01 46.6 -36 56 30           ~ 4 0
39 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 108 0
40 UCAC4 265-183516 Or* 19 01 49.3660476264 -37 00 28.636309008   18.4   16.6   M4.5 19 0
41 [SHJ2008] G-48 * 19 01 49.8 -36 52 43           ~ 1 0
42 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 554 0
43 [VMF2000] CoA 2 PoC 19 01 51 -36 58.9           ~ 2 0
44 V* R CrA Ae* 19 01 53.6764322232 -36 57 08.299341828 12.781 12.651 11.917 11.242 10.412 B5IIIpe 499 2
45 2MASS J19015374-3700339 Y*O 19 01 53.7537206544 -37 00 34.050751956           M7.5 27 2
46 [SHK2011b] 1 smm 19 01 53.9 -36 58 03           ~ 1 0
47 NAME Coronet Cluster Cl* 19 01 54 -36 57.2           ~ 106 1
48 2MASS J19015545-3657231 Y*O 19 01 55.460 -36 57 23.13           ~ 105 2
49 CHLT 14 Y*O 19 01 56.41 -36 57 28.0           ~ 121 1
50 [SHK2011b] 9 smm 19 01 57.0 -37 01 05           ~ 2 0
51 [CKR2003] MMS 14 mm 19 01 58.0 -37 01 03           ~ 3 0
52 2MASS J19015833-3700267 Y*O 19 01 58.34 -37 00 26.8           M5 9 0
53 V* T CrA Ae* 19 01 58.777008 -36 57 49.93704   14.087 13.130 11.823 10.678 F5? 179 0
54 2MASS J19020012-3702220 TT* 19 02 00.1219249728 -37 02 22.132961880   17.0 16.1     M4 22 0
55 [CKR2003] MMS 18 mm 19 02 08.6 -37 00 41           ~ 3 0
56 2MASS J19020967-3646344 Y*O 19 02 09.6773570184 -36 46 34.470837156   18.6   16.8   M4 15 0
57 [SHK2011b] 13 smm 19 02 11.4 -37 00 47           ~ 2 0
58 [SHK2011b] 11 smm 19 02 11.4 -36 56 22           ~ 1 0
59 2MASS J19021201-3703093 Y*O 19 02 12.0189397320 -37 03 09.420563916           M4.75 27 0
60 [CKR2003] MMS 19 mm 19 02 12.4 -36 57 17           ~ 5 0
61 [SHK2011b] 12 smm 19 02 13.7 -36 57 26           ~ 1 0
62 2MASS J19021667-3645493 Y*O 19 02 16.6800450216 -36 45 49.377696696           M5 24 0
63 JCMTSF J190217.0-370133 mm 19 02 17.8 -37 01 34           ~ 4 0
64 [SHK2011b] 23 smm 19 02 18.3 -37 04 43           ~ 1 0
65 [SHK2011b] 6 smm 19 02 18.3 -37 01 41           ~ 2 0
66 [SHK2011b] 16 smm 19 02 24.3 -36 56 50           ~ 2 0
67 2MASS J19022708-3658132 TT* 19 02 27.1008912432 -36 58 13.677942828   15.60 13.59 12.5   M1.9 42 0
68 [SHK2011b] 19 smm 19 02 33.5 -37 02 08           ~ 2 0
69 ISO-CrA 177 Y*O 19 02 54.6519242280 -36 46 19.134473988           M5 17 0
70 IRAS 18595-3712 Y*O 19 02 58.706 -37 07 34.67           ~ 60 0
71 [SHK2011b] 3 smm 19 02 59.4 -37 07 45           ~ 1 0
72 [SHK2011b] 7 smm 19 03 06.4 -37 14 53           ~ 2 0
73 V* VV CrA Or* 19 03 06.7410913704 -37 12 49.686912432   16.45 14.67 14.12 11.62 K7 133 0
74 [VMF2000] CoA 4 PoC 19 03 07 -37 16.6           ~ 2 0
75 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 118 1
76 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 918 1
77 QSO B1954-388 Bla 19 57 59.81927491 -38 45 06.3558881   18.47 17.07 16.73   ~ 239 1
78 Ass Cep OB 2 As* 21 51 +60.0           ~ 303 0
79 [SHJ2008] G-17 * ~ ~           ~ 2 0

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