2000ApJ...533..440G

Query : 2000ApJ...533..440G

2000ApJ...533..440G - Astrophys. J., 533, 440-453 (2000/April-2)

Does infall end before the class I stage?

GREGERSEN E.M., EVANS II N.J., MARDONES D. and MYERS P.C.

Abstract (from CDS):

We have observed HCO+ J=3-2 toward 16 class I sources and 18 class 0 sources, many of which were selected from Mardones et al.'s recent observations. Eight sources have profiles significantly skewed to the blue relative to optically thin lines. We suggest six sources as new infall candidates. We find an equal ``blue excess'' among class 0 and class I sources after combining this sample with that of Gregersen et al. We used a Monte Carlo code to simulate the temporal evolution of line profiles of optically thick lines of HCO+, CS, and H2CO in a collapsing cloud and found that HCO+ had the strongest asymmetry at late times. If a blue-peaked line profile implies infall, then the dividing line between the two classes does not trace the end of the infall stage.

Abstract Copyright: ∼

Journal keyword(s): Stars: Formation - Stars: Pre-Main-Sequence - Submillimeter

Simbad objects: 56

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Number of rows : 56
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 LDN 1448NA smm 03 25 36.49 +30 45 22.2           ~ 193 1
2 IRAS 03225+3034 IR 03 25 36.49 +30 45 22.2           ~ 165 1
3 SSTc2d J032536.4+304522 Y*O 03 25 36.49 +30 45 22.2           ~ 208 1
4 IRAS F03226+3033 Y*O 03 25 38.83 +30 44 06.2           ~ 371 0
5 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 266 1
6 IRAS 03235+3004 Y*O 03 26 37.425 +30 15 28.39           ~ 96 0
7 LDN 1455 DNe 03 28 00.6480 +30 07 58.800           ~ 198 1
8 IRAS 03256+3055 Y*O 03 28 45.306 +31 05 42.05           ~ 55 3
9 IRAS 03258+3104 Y*O 03 28 55.30 +31 14 27.8           ~ 173 1
10 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 513 3
11 V* V512 Per Or* 03 29 03.7578170808 +31 16 03.947525688           M3.5 419 0
12 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 770 1
13 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 489 0
14 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 625 0
15 IRAS 03282+3035 cor 03 31 20.98 +30 45 30.1           ~ 186 0
16 HH 211 Y*O 03 43 56.52 +32 00 52.8           ~ 414 0
17 IRAS 04166+2706 Y*O 04 19 42.62736 +27 13 38.4312           ~ 153 0
18 IRAS 04169+2702 Y*O 04 19 58.44936 +27 09 57.0672           K0-M4 130 1
19 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 823 1
20 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 900 0
21 2MASS J04314444+1808315 Y*O 04 31 44.44680 +18 08 31.5384           ~ 173 0
22 IRAS 04325+2402 Y*O 04 35 35.39160 +24 08 19.4244           ~ 161 0
23 IRAS 04365+2535 Y*O 04 39 35.19360 +25 41 44.7252           ~ 330 0
24 LDN 1527 DNe 04 39 53 +25 45.0           ~ 689 0
25 NAME HH 240/241 DNe 05 19 48.9 -05 52 05           ~ 115 1
26 [CRW97] OMC-3 MMS 1 Y*O 05 35 18.030 -05 00 17.77           ~ 33 0
27 2MASS J05351997-0501024 Y*O 05 35 19.97 -05 01 02.5           ~ 48 0
28 HOPS 87 Y*O 05 35 23.500 -05 01 29.58           ~ 123 0
29 [TSO2008] 18 mm 05 35 26.0 -05 05 42           ~ 47 1
30 JCMTSE J053526.4-050521 cor 05 35 26.5 -05 05 17           ~ 29 1
31 IRAS 05329-0505 Y*O 05 35 26.746 -05 03 55.08           ~ 103 0
32 NAME Mon OB1 G PoC 06 41 12 +09 55.6           ~ 108 0
33 Barnard 228 cor 15 43 00.9 -34 08 48           ~ 70 0
34 IRAS 15398-3359 Y*? 15 43 02.21016 -34 09 07.7112       18.38 21.72 ~ 215 0
35 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 429 0
36 [SSG2006] MMS002 smm 16 26 26.50 -24 24 30.9           ~ 241 0
37 YLW 16 IR 16 27 28 -24 39.5           ~ 19 0
38 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1357 1
39 LDN 146 MoC 16 57 17.5 -16 09 18           ~ 89 1
40 LDN 483 DNe 18 17 35 -04 39.8           ~ 359 0
41 SH 2-68 N Y*O 18 29 48.09 +01 16 45.0           ~ 161 1
42 GCNM 23 Y*O 18 29 49.63 +01 15 21.9           ~ 291 2
43 NAME Serpens SMM 4 cor 18 29 57.1 +01 13 15           ~ 143 0
44 IRAS 18274+0112 Y*O 18 29 57.73680 +01 14 05.6940           M4: 143 2
45 HH 108 HH 18 35 36.2 -00 35 09           ~ 19 0
46 IRAS 18595-3712 Y*O 19 02 58.706 -37 07 34.67           ~ 60 0
47 LDN 723 DNe 19 18 12 +19 13.6           ~ 155 0
48 LDN 673A DNe 19 20 25.8 +11 19 52           ~ 8 0
49 LDN 663 DNe 19 36 55 +07 34.4           ~ 698 0
50 LDN 1152 DNe 20 35 50.2 +67 54 22           ~ 73 0
51 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 606 0
52 LDN 1172 DNe 21 02 27.7 +67 54 08           ~ 57 0
53 LDN 1251A DNe 22 30 31.8 +75 14 17           ~ 76 2
54 LDN 1251B DNe 22 38 46.79 +75 11 32.6           ~ 51 1
55 NAME Cep E HII 23 03 12.779 +61 42 25.75           ~ 183 0
56 LDN 1262 MoC 23 25 47 +74 17.6           ~ 136 0

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