2002ApJ...580..317B


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.01CET20:42:54

2002ApJ...580..317B - Astrophys. J., 580, 317-335 (2002/November-3)

The initial mass function in the Taurus star-forming region.

BRICENO C., LUHMAN K.L., HARTMANN L., STAUFFER J.R. and KIRKPATRICK J.D.

Abstract (from CDS):

By combining a deep optical imaging (I,z') survey of 8 deg2 in the Taurus star-forming region with data from the Two-Micron All-Sky Survey (2MASS) and follow-up spectroscopy, we have performed a search for low-mass Taurus members that is complete to 0.02 Mfor reddenings of AV≲4. We report the discovery of nine new members with spectral types of M5.75-M9.5, corresponding to masses of 0.1-0.015 Mby recent evolutionary models. The new M9.5 member is the least massive brown dwarf found to date in the Taurus star-forming region. We derive an initial mass function (IMF) for the fields surveyed in this work and in our previous studies, which encompass 54% of the known Taurus membership. We compare the Taurus IMF with a similarly derived one for the Trapezium Cluster and to mass functions for the M35 and Pleiades open clusters. While the IMFs in all of these regions flatten near ∼0.8 M, the mass function in Taurus is more narrow and sharply peaked at this mass. Our survey indicates that Taurus has ∼2xfewer brown dwarfs at 0.02-0.08 M than the Trapezium. We discuss the implications of these results for theories of the IMF, and suggest that the lower frequency of brown dwarfs in Taurus relative to the Trapezium may result from the low-density star-forming environment, leading to larger minimum Jeans masses.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Stars: Evolution - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Luminosity Function, Mass Function - Stars: Pre-Main-Sequence

Nomenclature: Table 2: [BLH2002] KPNO-Tau N (Nos 1-9). Table 3: [BLH2002] KPNO-Cand N (Nos 1-5). Table 5: [BLH2002] IRAS 04108+2803 A (Nos A-B).

CDS comments: Parag. 4.2 : BR 2239-0447 is a misprint for 2339-0447

Simbad objects: 163

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Number of rows : 163

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 IC 348 OpC 03 44 34 +32 09.8           ~ 1238 1
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3037 0
3 SA 95- reg 03 53 21.0 -00 01 10           ~ 83 0
4 Barnard 209 DNe 04 12.4 +28 19           ~ 19 0
5 V* V1095 Tau TT* 04 13 14.1550545701 +28 19 10.670834057   15.32 13.81 13.62   M4 97 0
6 V* V1096 Tau TT* 04 13 27.2226142854 +28 16 24.653683705   15.42 13.53 13.07   M0 72 0
7 NAME IRAS 04108+2803A Y*O 04 13 53.2804501826 +28 11 23.219708445           M5.5 27 0
8 NAME IRAS 04108+2803B Y*O 04 13 54.71688 +28 11 32.8992           K0-M3 36 0
9 IRAS 04108+2803 mul 04 13 54.9 +28 11 31           ~ 89 1
10 NAME [BM89] L1495 PoC 04 14 08.2 +28 09 31           ~ 170 0
11 [BDB2003] G168.14-16.28 Cl* 04 14 12 +28 17.5           ~ 7 1
12 HD 283447 Or* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 384 0
13 V* FM Tau Or* 04 14 13.5839505100 +28 12 49.166941548 14.44   13.80 13.64   M0/2e 193 0
14 V* FN Tau Or* 04 14 14.5943659839 +28 27 58.063377983     14.70 13.68   M5 144 0
15 V* CW Tau Or* 04 14 17.0041128798 +28 10 57.765657757 13.92 13.64 12.36 12.86   K0Ve 320 0
16 [BCG93] 1 TT* 04 14 17.6094853639 +28 06 09.650035718 18.04         M4.5 75 0
17 [BHS98] MHO 1 TT* 04 14 26.2709425846 +28 06 03.288644046           M2.5 36 1
18 [BHS98] MHO 2 TT* 04 14 26.4022247808 +28 05 59.640852985           M2.5 42 1
19 NAME IRAS 04114+2757G TT* 04 14 30.5533533766 +28 05 14.599582233           M2.2 47 0
20 V* V1098 Tau Or* 04 14 47.9897419517 +27 52 34.232647358   14.08 11.73 10.95   M1 106 0
21 V* FO Tau Or* 04 14 49.2797479571 +28 12 30.461592529       14.92   M3.5e+M3.5e 113 0
22 [BCG93] 2 TT* 04 15 05.1566689290 +28 08 46.055640665           M5.5 40 0
23 2MASS J04151327+2751119 * 04 15 13.2762501551 +27 51 11.732011470           M5Ve 1 0
24 [BLH2002] KPNO-Tau 1 LM* 04 15 14.7224038902 +28 00 09.386264531     24.063     M8.5Ve 37 0
25 EM* LkCa 4 Or* 04 16 28.1070192558 +28 07 35.732032828   13.96   11.825   K7:Ve 145 0
26 2MASS J04170580+2752463 * 04 17 05.8087454443 +27 52 46.134900330           M4Ve 1 0
27 V* CY Tau Or* 04 17 33.7281514373 +28 20 46.809969664 14.52 14.68 13.40 12.59   M1.5 236 0
28 V* V1312 Tau TT* 04 17 38.9462203679 +28 33 00.570855332   15.57 13.26 13.12   M2 89 0
29 IRAS F04147+2822 TT* 04 17 49.6578079496 +28 29 36.325239443           M3.7 63 0
30 LDN 1495 DNe 04 18.1 +27 37           ~ 297 1
31 [SS94] V410 X-ray 3 TT* 04 18 07.9726935315 +28 26 03.673508581     18.319     M6 63 0
32 2MASS J04181710+2828419 TT* 04 18 17.1091861192 +28 28 41.921033525     22.175     M6.4 75 0
33 2MASS J04182239+2824375 Y*O 04 18 22.394 +28 24 37.56           ~ 13 0
34 2MASS J04182909+2826191 Y*O 04 18 29.09760 +28 26 19.1148           ~ 29 0
35 V* V410 Tau Or* 04 18 31.1083261392 +28 27 16.155411536   12.13 10.75 8.45 9.408 K3Ve 428 0
36 V* DD Tau Or* 04 18 31.1271804823 +28 16 29.158626278 15.94 15.49 14.10 13.76   M3.5e+M3.5e 179 0
37 V* CZ Tau Or* 04 18 31.5906879009 +28 16 58.161795569 15.96 16.60 15.70 14.77   M2 129 0
38 IRAS 04154+2823 Y*O 04 18 32.0460600618 +28 31 14.990027099           M2.5 59 0
39 2MASS J04183444+2830302 Y*O 04 18 34.44696 +28 30 30.2256           M0 39 0
40 2MASS J04184023+2824245 TT* 04 18 40.2358778388 +28 24 24.075268613           ~ 30 0
41 V* V892 Tau Ae* 04 18 40.6120892867 +28 19 15.641672501   16.6 14.69 14.35   A0Ve 270 0
42 LR 1 Y*O 04 18 41.33232 +28 27 25.0092           K7 34 0
43 [SS94] V410 X-ray 7 TT* 04 18 42.4993698860 +28 18 49.913254563       18.02 15.42 ~ 36 0
44 2MASS J04184505+2820528 Y*O 04 18 45.059 +28 20 52.80           ~ 13 0
45 V* V1023 Tau Or* 04 18 47.0296109602 +28 20 07.490327496   14.31 12.00 11.21   K7 145 0
46 [BDB2003] G168.89-15.55 Cl* 04 18 51 +28 16.4           ~ 7 1
47 [BLH2002] KPNO-Tau 2 LM* 04 18 51.1522243376 +28 14 33.296824693     21.376     M7.5Ve 38 0
48 NAME CoKu Tau 1 Y*O 04 18 51.4865838204 +28 20 26.105713878     19.3     K7+M 77 0
49 IRAS 04158+2805 Y*O 04 18 58.1407377664 +28 12 23.347645825           M5.25 89 0
50 2MASS J04190110+2819420 TT* 04 19 01.1041061433 +28 19 42.084605479           M5.9 56 0
51 2MASS J04190197+2822332 TT* 04 19 01.9773489612 +28 22 33.268594450           M5.5 37 0
52 V* FQ Tau Or* 04 19 12.812616 +28 29 32.98128       15.00   M3 98 0
53 WK81 1 TT* 04 19 26.2671630797 +28 26 14.259129092   14.81   12.240   K7 195 1
54 V* V1070 Tau Or* 04 19 41.2688488305 +27 49 48.151086734   13.75 12.25 11.14   M0 134 0
55 2MASS J04254234+2621479 * 04 25 42.3411114112 +26 21 48.004225983           ~ 1 0
56 [BLH2002] KPNO-Tau 3 LM* 04 26 29.3901723833 +26 24 13.722007135     20.239     M6Ve 43 0
57 V* FV Tau Or* 04 26 53.5415038432 +26 06 53.942994170 19.58     15.26   K5 126 2
58 CoKu FV Tau c TT* 04 26 54.4012605412 +26 06 50.942995443 20.35   16.70     M3.5e+M2.5e 61 0
59 2MASS J04270266+2605304 Y*O 04 27 02.66593 +26 05 30.3790           ~ 135 0
60 V* DF Tau B * 04 27 02.79 +25 42 22.4     13.51     M3.5e 19 0
61 V* DF Tau A * 04 27 02.79 +25 42 22.4     12.62     M2e 28 0
62 V* DF Tau Or* 04 27 02.7917481241 +25 42 22.456361256 11.97 12.25 11.42 10.31 9.14 M3Ve 463 1
63 V* DG Tau Or* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 942 1
64 LDN 1497 DNe 04 27.1 +28 37           ~ 6 0
65 [BLH2002] KPNO-Tau 4 BD* 04 27 27.9997171623 +26 12 05.097974406     24.722 20.54 18.75 L0 65 0
66 LDN 1521D DNe 04 27 46.5 +26 18 52           ~ 215 0
67 IRAS 04248+2612 Y*O 04 27 57.30696 +26 19 18.3036           M 144 0
68 [HJS91] 507 TT* 04 29 20.7028522671 +26 33 40.435127204 17.35   14.58     M4 37 0
69 V* FW Tau Or* 04 29 29.703744 +26 16 53.06412       15.85   M5.5 118 0
70 V* DH Tau Or* 04 29 41.5520056304 +26 32 58.123761109 15.14 14.62 13.10 13.01   M1Ve 269 0
71 V* DI Tau Or* 04 29 42.4736177473 +26 32 49.119618729 16.39 15.20 13.60     M0Ve 197 0
72 [BLH2002] KPNO-Tau 5 LM* 04 29 45.6733565875 +26 30 46.559502443     19.690 19.10 15.08 M7.5Ve 48 0
73 V* IQ Tau Or* 04 29 51.5569553814 +26 06 44.854858369 15.43   13.80 12.28 11.11 M0.5 203 0
74 [BLH2002] KPNO-Tau 6 BD* 04 30 07.2484355471 +26 08 20.698295788     22.292 20.56 17.90 M8.5Ve 51 0
75 V* DK Tau A * 04 30 44.2409691803 +26 01 24.730398215           K5Ve 248 0
76 V* DK Tau Or* 04 30 44.243376 +26 01 24.65328 13.32 14.59 13.05 12.08   K7e+K7e 301 0
77 V* DK Tau B * 04 30 44.3924138334 +26 01 23.580661828           K7e 24 0
78 [BLH2002] KPNO-Tau 7 LM* 04 30 57.2037457394 +25 56 39.560007407     22.068   17.16 M8Ve 47 0
79 VSS XI-2 TT* 04 31 15.7846772782 +18 20 07.068277320     15.72     M4.25 42 0
80 [BDB2003] G178.75-19.96 Cl* 04 31 24 +18 18.9           ~ 7 1
81 2MASS J04312405+1800215 TT* 04 31 24.0575671088 +18 00 21.455153686   20.38 18.678   14.32 M7 64 0
82 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 773 1
83 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 817 0
84 EM* LkHA 358 TT* 04 31 36.1396524070 +18 13 43.176961457     19.0     M0.9 88 0
85 V* V1213 Tau Or* 04 31 37.47192 +18 12 24.4800           K7 523 0
86 V* HL Tau Or* 04 31 38.471952 +18 13 58.08504   15.89 14.49 14.39   K5 1231 0
87 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 796 0
88 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 410 1
89 2MASS J04314444+1808315 Y*O 04 31 44.44680 +18 08 31.5384           ~ 152 0
90 NAME HK Tau A *i* 04 31 50.55 +24 24 18.6           M1 29 0
91 V* HK Tau Or* 04 31 50.5722969258 +24 24 17.775488652 16.81   15.10     M0.5 300 1
92 NAME HK Tau B TT* 04 31 50.58 +24 24 16.4           M1 69 0
93 V* V710 Tau ** 04 31 57.79848 +18 21 36.9396           ~ 154 0
94 V* V710 Tau A TT* 04 31 57.8032267772 +18 21 34.726898440       13.87   M2/3e 154 0
95 2MASS J04315844+2543299 TT* 04 31 58.4512764298 +25 43 30.018429763     15.96     M4.9 36 0
96 [BDB2003] G173.93-15.94 Cl* 04 32 01 +24 24.3           ~ 7 1
97 L 1551-51 Or* 04 32 09.2838548075 +17 57 22.695083303   13.29       K7e 119 0
98 V* V827 Tau TT* 04 32 14.5731257511 +18 20 14.719337994   14.00 12.63 12.35   K7Ve 158 0
99 Haro 6-13 Or* 04 32 15.4177438039 +24 28 59.580866027 19.22   17.7     M0 186 1
100 V* V826 Tau TT* 04 32 15.8394065935 +18 01 38.751126168   13.51 12.074   10.312 K7.0 166 0
101 2MASS J04321606+1812464 TT* 04 32 16.0655428266 +18 12 46.383508261   19.20 17.595     M6.5 73 0
102 V* V928 Tau Or* 04 32 18.8839760967 +24 22 26.713747659 17.65   13.7     M0.5 81 0
103 2MASS J04322210+1827426 TT* 04 32 22.1106070891 +18 27 42.648224021           M5.0 40 0
104 2MASS J04322627+1827521 TT* 04 32 26.2778233566 +18 27 52.149741588           M5.3 28 0
105 V* FY Tau Or* 04 32 30.5786392247 +24 19 57.364725369 17.83 18.05 13.49 14.17   M0.1 100 0
106 V* FZ Tau Or* 04 32 31.7629319321 +24 20 03.057541003 16.15     15.04   M0 122 0
107 V* UZ Tau ** 04 32 43.02168 +25 52 30.9036           M4Ve+M1/3Ve 288 0
108 V* UZ Tau A TT* 04 32 43.0744163742 +25 52 31.022242441       13.15   M2.0e+M3.0e 90 0
109 V* V1076 Tau Or* 04 32 43.7360056323 +18 02 56.310753348   14.72       K7 85 0
110 NAME Kutner's Cloud MoC 04 32 44.6 +24 23 13           ~ 211 0
111 NAME [BM89] TMC-2 PoC 04 32 44.7 +24 25 13           ~ 186 0
112 GSC 01270-00621 * 04 32 46.2245864292 +18 09 15.814590303   14.99 13.90 13.70   G5 2 0
113 2MASS J04330197+2421000 TT* 04 33 01.9723467772 +24 21 00.071577295     17.951     M7.1 34 0
114 V* GH Tau Or* 04 33 06.2181025969 +24 09 33.628411049     13.20 12.59   M3Ve 169 0
115 V* V807 Tau Or* 04 33 06.6303920517 +24 09 55.044051684   12.10 11.21 11.18   K7 133 2
116 V* V830 Tau TT* 04 33 10.0299730541 +24 33 43.255853678   13.91 12.08 11.30   M0-1 175 1
117 IRAS S04301+2608 Y*O 04 33 14.3602980976 +26 14 23.494786529           M0 33 0
118 LDN 1536 DNe 04 33 24.6 +22 43 29           ~ 97 0
119 V* GI Tau Or* 04 33 34.0608378045 +24 21 17.067391746 14.34   13.70 12.15 11.06 K5Ve 257 1
120 V* GK Tau Or* 04 33 34.5626781676 +24 21 05.854541262 15.50   13.00 12.02 10.62 K7:Ve 277 0
121 V* IS Tau Or* 04 33 36.7943820957 +26 09 49.071437296 18.52     14.79   M2.0 115 0
122 V* HN Tau Or* 04 33 39.3612389736 +17 51 52.302839814   14.76 13.40 13.05   K5e 223 0
123 V* DM Tau Or* 04 33 48.7335659850 +18 10 09.974471722 14.30 14.82 14.00     M2Ve 524 0
124 V* IT Tau ** 04 33 54.70128 +26 13 27.5232   16.76 14.63     K6.0 88 0
125 V* V1077 Tau Or* 04 34 18.0134345949 +18 30 06.335688396   13.70       G8 74 0
126 V* AA Tau Or* 04 34 55.4222683130 +24 28 53.038273587 13.14 13.34 12.20     K5Ve 640 0
127 V* HO Tau Or* 04 35 20.2103777721 +22 32 14.557063236     15.20     M0.5 108 0
128 V* FF Tau Or* 04 35 20.9049286667 +22 54 24.234895403 17.57 15.73       K7 72 1
129 2MASS J04352450+1751429 TT* 04 35 24.5038529437 +17 51 42.495480359   15.680 14.030 13.310   M1.5 49 2
130 V* DN Tau Or* 04 35 27.3776240781 +24 14 58.908761629 13.56 12.88 11.50 11.79   M1:Ve 354 0
131 IRAS 04325+2402 Y*O 04 35 35.39160 +24 08 19.4244           ~ 151 0
132 NAME CoKu Tau 3 TT* 04 35 40.937952 +24 11 08.49012 20.58         M4.3 92 0
133 [BLH2002] KPNO-Tau 8 Y*O 04 35 41.8388746981 +22 34 11.595178814 20.64   19.261     M6Ve 36 0
134 [BDB2003] G175.71-16.24 Cl* 04 35 50 +22 54.1           ~ 6 1
135 [BLH2002] KPNO-Tau 9 LM* 04 35 51.4277984148 +22 49 11.868048124     24.918   18.76 M8.5V 38 0
136 V* HP Tau Or* 04 35 52.7821592361 +22 54 23.158368128 17.39 14.9 14.90     K2-5e 193 0
137 CoKu HP Tau G3 TT* 04 35 53.4991854163 +22 54 09.000431829 18.21   14.8     M0.6 59 0
138 CoKu HP Tau G2 Or* 04 35 54.1553246504 +22 54 13.404170652 13.63 12.31 11.158 10.14 9.172 G2e 113 0
139 Haro 6-28 Or* 04 35 56.8652987075 +22 54 35.826437972 18.94         M3.1 85 0
140 2MASS J04361038+2259560 BD* 04 36 10.3838421343 +22 59 56.003013804     22.520   16.81 M8Ve 46 0
141 2MASS J04363893+2258119 BD* 04 36 38.9288541165 +22 58 11.845890661     21.654   16.88 M7.75 45 0
142 LDN 1528 DNe 04 37.1 +25 46           ~ 9 0
143 [BDB2003] G174.12-14.01 Cl* 04 39 04 +25 30.9           ~ 6 1
144 ITG 17 Y*O 04 39 47.4820305505 +26 01 40.693626234     21.556   15.78 M7 85 0
145 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3576 0
146 LDN 1538 DNe 04 46.1 +25 05           ~ 14 0
147 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 705 0
148 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
149 2MASS J05044139+2509544 TT* 05 04 41.3974730845 +25 09 54.581861436           M3.7 39 0
150 2MASS J05061674+2446102 TT* 05 06 16.7521509473 +24 46 10.158429144           M3/5e 27 0
151 2MASS J05061839+2456316 * 05 06 18.3966632751 +24 56 31.711955853           ~ 1 0
152 2MASS J05062332+2432199 TT* 05 06 23.3325973176 +24 32 19.923493583           M3/5e 37 0
153 2MASS J05071206+2437163 TT* 05 07 12.0679346815 +24 37 16.368894440           K6 20 0
154 2MASS J05075496+2500156 TT* 05 07 54.9656053105 +25 00 15.599361879           M3.7 39 0
155 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2021 1
156 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1486 1
157 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 492 0
158 NGC 2168 OpC 06 08 54 +24 20.0           ~ 466 0
159 IRAS 09540-0946 Mi* 09 56 32.9072765875 -10 01 18.046582066           M8III 10 0
160 NAME Cha I MoC 11 06 48 -77 18.0           ~ 993 1
161 V* FV Boo Mi* 15 08 25.7454416945 +09 36 18.378605508           M9III 53 0
162 SA 110- reg 18 45 +00.6           ~ 95 0
163 DENIS J234202.7-043104 * 23 42 02.7462428011 -04 31 05.088369524         13.95 M7-8III 10 0

    Equat.    Gal    SGal    Ecl

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2020.12.01-20:42:54

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