2008ApJ...684..654L

Query : 2008ApJ...684..654L

2008ApJ...684..654L - Astrophys. J., 684, 654-662 (2008/September-1)

New low-mass stars and brown dwarfs with disks in the Chamaeleon I star-forming region.

LUHMAN K.L. and MUENCH A.A.

Abstract (from CDS):

We have used images obtained with the Infrared Array Camera and the Multiband Imaging Photometer on board the Spitzer Space Telescope to search for low-mass stars and brown dwarfs with circumstellar disks in the Chamaeleon I star-forming region. Through optical spectroscopy of sources with red colors in these data, we have identified seven new disk-bearing members of the cluster. Three of these objects are probably brown dwarfs, according to their spectral types (M8, M8.5, M8-L0). Three of the other new members may have edge-on disks, based on the shapes of their infrared spectral energy distributions. One of the possible edge-on systems has a steeply rising slope from 4.5 to 24 µm, indicating that it could be a Class I source (star+disk+envelope) rather than a Class II source (star+disk). If so, then it would be one of the least massive known Class I protostars (M5.75, M∼0.1 M☉).

Abstract Copyright: ∼

Journal keyword(s): Accretion, Accretion Disks - Stars: Planetary Systems: Protoplanetary Disks - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/ApJ/684/654): new.dat table3.dat>

Simbad objects: 90

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Number of rows : 90
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 Perseus Cloud SFR 03 35.0 +31 13           ~ 1553 0
2 IRAS 04158+2805 Or* 04 18 58.1336295120 +28 12 23.355499140           M5.25 124 0
3 IRAS 04248+2612 Or* 04 27 57.3239527944 +26 19 18.033264696           M 160 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
5 IRAS 04489+3042 Or* 04 52 06.6862507800 +30 47 17.007457092           M2 73 0
6 2MASS J10533978-7712338 TT* 10 53 39.7627565760 -77 12 33.939774612     19.38   15.56 M2.75 26 0
7 V* SX Cha A Or* 10 55 59.8005615312 -77 24 40.161340476           M1.5 15 0
8 V* SY Cha Or* 10 56 30.3883129248 -77 11 39.401977596         11.29 K5Ve 194 0
9 Sz 4 TT* 10 57 42.0977196408 -76 59 35.641299948   14.1 14.80   12.17 M4Ve 53 0
10 2MASS J10580597-7711501 Or* 10 58 05.9730159264 -77 11 50.171141904         15.89 M5.25 26 0
11 V* SZ Cha Or* 10 58 16.7500775160 -77 17 17.185749900     12.68   10.62 K0e 143 0
12 V* TW Cha Or* 10 59 01.0607352312 -77 22 40.947126636     13.40   11.68 K8Ve 156 0
13 Hen 3-545 Or* 10 59 06.9715593000 -77 01 40.309233240   12.91 11.136   9.596 K4Ve 237 0
14 ESO-HA 554 LM* 11 01 32.0371795464 -77 18 25.073955180         17.79 M8.5e 18 0
15 2MASS J11020610-7718079 Or* 11 02 06.0692257056 -77 18 07.977917700           M8 5 0
16 [LES2004] ChaI 424 LM* 11 02 53.74920 -77 22 56.1468           M8.5 6 0
17 Ass Cha T 1-8 TT* 11 02 55.0255671144 -77 21 50.814186624     16.25 15.17 13.40 M4.5e 76 0
18 V* GR Cha Or* 11 03 47.6427402312 -77 19 56.417579004         13.91 M5e 29 0
19 Hn 3 Or* 11 03 56.8213107528 -77 21 32.974510752   17.05 15.44 15.03 12.57 M4IIIe 39 0
20 IRAS 11030-7702 TT* 11 04 22.7159038128 -77 18 08.299910700     17.89     K6/M0e 75 0
21 HH 48 HH 11 04 22.8 -77 18 08           ~ 50 0
22 BYB 18 Or* 11 04 42.5993270304 -77 41 57.167040408         13.63 M4.5e 63 0
23 Sz 13 Or* 11 04 57.0089116656 -77 15 57.049656948     18.91 16.65 14.68 M3e 55 0
24 Hn 4 Or* 11 05 14.6449521936 -77 11 29.206958928         13.20 M4+M3 31 0
25 2MASS J11052272-7709290 Or* 11 05 22.6769855136 -77 09 28.968223356       17.61 15.38 M4.75 17 0
26 CHXR 15 Or* 11 05 42.8800288464 -77 26 51.567587304         13.51 M5+M5 39 0
27 Ass Cha T 2-21 TT* 11 06 15.3471261840 -77 21 56.720362608   12.58 11.01   9.35 G5Ve 144 0
28 NAME 2M/Cha J11062854-7618039 * 11 06 28.54 -76 18 03.9           M9 4 1
29 2MASS J11062942-7724586 Y*? 11 06 29.426 -77 24 58.64           M6 14 0
30 [NC98] Cha HA 12 Or* 11 06 37.9647720216 -77 43 09.113892564     20.6   15.91 M6.5e 45 0
31 Ass Cha T 2-22 Or* 11 06 43.4642963688 -77 26 34.426398552         13.02 M3e 40 0
32 V* UX Cha Or* 11 06 45.0944158128 -77 27 02.383275420     14.78   12.07 K5Ve 66 0
33 IRAS 11051-7706 Y*O 11 06 46.025 -77 22 29.67           ~ 101 0
34 [PMG2001] NIR 76 Y*? 11 06 46.580 -77 22 32.56           ~ 58 0
35 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1266 1
36 [PCW91] Ced 110 IRS 11 Y*O 11 06 58.030 -77 22 48.87           ~ 21 0
37 V* UY Cha Or* 11 06 59.0257686696 -77 18 53.404488720         12.97 M4Ve 74 0
38 2MASS J11070369-7724307 Y*? 11 07 03.693 -77 24 30.71           M7.5 12 0
39 IRAS 11057-7706 Y*O 11 07 09.19896 -77 23 04.9920           ~ 64 0
40 [CCE98] 2-21 Y*O 11 07 09.25152 -77 18 47.1420           M2.5 26 0
41 Hn 6 Or* 11 07 11.4551582832 -77 46 39.344493324         13.31 M3e 45 0
42 V* GZ Cha Or* 11 07 16.22784 -77 23 06.8316           M1 31 0
43 [CCE98] 2-24 Y*O 11 07 21.426 -77 22 11.76           M2 37 0
44 V* VV Cha Or* 11 07 28.241088 -76 52 11.92620   16.00 14.72 14.48 12.19 M1.5+M3 74 0
45 2MASS J11073832-7747168 Or* 11 07 38.3094558336 -77 47 16.742658084     18.37 16.72 14.53 M5e 26 0
46 RX J1108.2-7728 Y*O 11 07 55.775088 -77 27 25.52724   15.26 13.40 13.07 11.04 K3Ve 59 0
47 V* HM Cha Or* 11 07 57.2800691640 -77 17 26.241455868       20.9 17.14 M0.75-M1.75 42 0
48 ESO-HA 561 Or* 11 07 59.8879742016 -77 15 31.752670104       17.87 15.45 M6.5e 26 0
49 CHXR 30A Or* 11 07 59.9497969992 -77 17 30.576549264   21.8   18.3 15.78 K8 36 0
50 2MASS J11082570-7716396 Y*O 11 08 25.70520 -77 16 39.6192       23.46 20.75 M8 13 0
51 ISO-ChaI 147 Or* 11 08 26.4697073400 -77 15 55.074237156         16.81 M5.75 51 0
52 Ass Cha T 1-20 Or* 11 08 39.0261275112 -77 16 04.163889324   18.44 16.28 15.822 13.17 K5Ve 95 0
53 [AKS95b] RX J1108.8-7519a TT* 11 08 49.73 -75 19 41.6           ~ 9 0
54 2MASS J11085326-7519374 Or* 11 08 53.2624718232 -75 19 37.422907320     12.17     M2 22 1
55 V* PU Car TT* 11 08 53.6905436304 -75 21 36.001367136   15.487 14.275 14.560   M1Ve 40 0
56 V* VY Cha Or* 11 08 54.6059374368 -77 02 13.006464720   14.8     13.60 K8Ve 80 0
57 Hn 7 Or* 11 09 05.1044667264 -77 09 58.026125412         13.96 M5e 34 0
58 NAME Sz 30C Or* 11 09 12.9437955504 -77 29 11.581308204           K8Ve 15 0
59 [LES2004] ChaI 602 LM* 11 09 29.0817746064 -76 59 18.130084800         15.70 M5.25 14 0
60 HJM C 5-3 Or* 11 09 37.7440602000 -77 10 41.065602960         15.44 K7 21 0
61 HJM C 7-1 Or* 11 09 42.5612580768 -77 25 57.929074932         15.91 M6e 43 0
62 BYB 43 Or* 11 09 47.3883040248 -77 26 29.187831192         16.62 M3.25e 60 0
63 2MASS J11094866-7714383 Y*O 11 09 48.67 -77 14 38.3           M1 11 0
64 Ced 112 RNe 11 09 52.4 -76 36 57           ~ 32 0
65 ISO-ChaI 220 Or* 11 09 53.3244652320 -77 28 36.603732468           M5.75 34 0
66 2MASS J11095493-7635101 Or* 11 09 54.8379253896 -76 35 10.411560636           M5.75 7 0
67 [PMK99] IR Cha INa4 Y*O 11 10 03.368 -76 33 11.13           M4: 17 0
68 HJM C 1-4 Or* 11 10 03.6830951520 -76 33 29.218685616     18.78 16.1 14.72 K8e 69 0
69 2MASS J11100785-7727480 Or* 11 10 07.8396430440 -77 27 48.063966876         17.79 M5.5 36 0
70 HJM C 6-2 Or* 11 10 28.5085562328 -77 16 59.595145932     17.93   13.97 M3Ve 44 0
71 [LES2004] ChaI 405 TT* 11 10 34.7926198584 -77 22 05.249586360     20.9   15.61 M4 30 0
72 ISO-ChaI 250 LM* 11 10 36.4196358816 -77 22 13.088141364         16.52 M4.75 22 0
73 ISO-ChaI 252 Or* 11 10 41.3874327240 -77 20 47.961251340     22.4 20.06 17.27 ~ 40 0
74 Ass Cha T 1-27 Or* 11 10 49.5667074984 -77 17 51.754670016   16.80 16.64   13.84 M4Ve 92 0
75 ESO-HA 568 Or* 11 10 50.7394673592 -77 18 03.172230828     18.27 16.65 14.50 M4.5e 29 0
76 V* IK Cha Or* 11 10 53.5796812512 -77 25 00.472704888         17.51 M4.5 36 0
77 HJM C 2-5 Or* 11 10 55.9782007344 -76 45 32.646407688         13.95 M6e 54 0
78 HJM E 4-7 LM* 11 11 22.6240346520 -77 05 53.885035788         14.02 M4Ve 29 0
79 2MASS J11120288-7722483 Or* 11 12 02.8702394208 -77 22 48.317243232       18.57 16.26 M6 14 0
80 V* IM Cha Or* 11 12 03.5025776424 -77 26 00.841371900     20.08     M6e 42 0
81 2MASS J11122250-7714512 LM* 11 12 22.3529552304 -77 14 51.101363472       22.22 19.57 M9.25 9 0
82 [LES2004] ChaI 601 LM* 11 12 30.9867590712 -76 53 34.193460948           M7 20 0
83 HJM E 4-3 Or* 11 12 42.1036824000 -76 58 40.108452312   14.74 13.29 12.98   K5Ve 40 0
84 Ass Cha T 2-54 TT* 11 12 42.6709132056 -77 22 22.943489160     11.103   9.653 G8+K7 102 2
85 HJM E 2-9 Or* 11 12 48.6110100768 -76 47 06.614161764         13.66 M4e 35 0
86 HJM E 4-4 Or* 11 13 20.1444527808 -77 01 04.444538196   16.17 14.63   12.31 M2.75 29 0
87 Ass Cha T 1-32 Or* 11 17 36.9756803040 -77 04 38.123504472   13.1 13.50   11.78 M0.5e 102 0
88 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 887 0
89 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
90 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1

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