2016A&A...586A..44C


Query : 2016A&A...586A..44C

2016A&A...586A..44C - Astronomy and Astrophysics, volume 586A, 44-44 (2016/2-1)

Classifying the embedded young stellar population in Perseus and Taurus and the LOMASS database.

CARNEY M.T., YILDIZ U.A., MOTTRAM J.C., VAN DISHOECK E.F., RAMCHANDANI J. and JORGENSEN J.K.

Abstract (from CDS):

The classification of young stellar objects (YSOs) is typically done using the infrared spectral slope or bolometric temperature, but either can result in contamination of samples. More accurate methods to determine the evolutionary stage of YSOs will improve the reliability of statistics for the embedded YSO population and provide more robust stage lifetimes. We aim to separate the truly embedded YSOs from more evolved sources. Maps of HCO+ J=4-3 and C18O J=3-2 were observed with HARP on the James Clerk Maxwell Telescope (JCMT) for a sample of 56 candidate YSOs in Perseus and Taurus in order to characterize the presence and morphology of emission from high density (ncrit >106/cm3) and high column density gas, respectively. These are supplemented with archival dust continuum maps observed with SCUBA on the JCMT and Herschel PACS to compare the morphology of the gas and dust in the protostellar envelopes. The spatial concentration of HCO+ J=4-3 and 850 µm dust emission are used to classify the embedded nature of YSOs. Approximately 30% of Class 0+I sources in Perseus and Taurus are not Stage I, but are likely to be more evolved Stage II pre-main sequence (PMS) stars with disks. An additional 16% are confused sources with an uncertain evolutionary stage. Outflows are found to make a negligible contribution to the integrated HCO+ intensity for the majority of sources in this study. Separating classifications by cloud reveals that a high percentage of the Class 0+I sources in the Perseus star forming region are truly embedded Stage I sources (71%), while the Taurus cloud hosts a majority of evolved PMS stars with disks (68%). The concentration factor method is useful to correct misidentified embedded YSOs, yielding higher accuracy for YSO population statistics and Stage timescales. Current estimates (0.54Myr) may overpredict the Stage I lifetime on the order of 30%, resulting in timescales down to 0.38Myr for the embedded phase.

Abstract Copyright:

Journal keyword(s): astrochemistry - stars: statistics - submillimeter: stars - stars: protostars - stars: formation

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 74

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Number of rows : 74
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 LDN 1448 DNe 03 22.5 +30 35           ~ 490 0
2 IRAS 03222+3034 Y*O 03 25 22.32 +30 45 13.9           ~ 131 0
3 SSTc2d J032536.4+304522 Y*O 03 25 36.49 +30 45 22.2           ~ 190 1
4 IRAS 03235+3004 Y*O 03 26 37.425 +30 15 28.39           ~ 75 0
5 NAME LDN 1455 IRS 5 Y*O 03 27 38.255 +30 13 58.57           ~ 45 0
6 NAME LDN 1455 IRS 1 cor 03 27 39.08 +30 13 03.1           ~ 147 0
7 NAME LDN 1455 IRS 4 cor 03 27 43.23 +30 12 28.9           ~ 67 0
8 LDN 1455 DNe 03 28 00.6480 +30 07 58.800           ~ 174 1
9 2MASS J03283258+3111040 cor 03 28 32.581 +31 11 04.10           ~ 44 0
10 [EYG2006] Bolo 28 cor 03 28 34.53 +31 07 05.5           ~ 34 0
11 IRAS 03255+3103 Y*O 03 28 37.06800 +31 13 31.0044           ~ 82 1
12 [EYG2006] Bolo 30 Y*O 03 28 39.10 +31 06 01.7           ~ 35 0
13 [HFR2007] 55 cor 03 28 40.63 +31 17 56.5           ~ 38 1
14 IRAS 03256+3055 Y*O 03 28 45.306 +31 05 42.05           ~ 49 3
15 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 420 3
16 EM* LkHA 353 Em* 03 28 59.5496298575 +31 21 46.709028393           ~ 26 0
17 [EYG2006] Bolo 40 cor 03 28 59.63 +31 21 33.9           ~ 26 0
18 [SK2001] 1 Y*O 03 29 00.55 +31 12 00.8           ~ 54 1
19 ASR 114 Y*O 03 29 01.16520 +31 20 24.4140           ~ 73 1
20 [RAC97] VLA 43 Y*O 03 29 01.28 +31 20 23.9           ~ 4 0
21 2MASS J03290149+3120208 Y*O 03 29 01.492 +31 20 20.84           ~ 27 0
22 [KJT2007] SMM 62 Y*O 03 29 01.66 +31 20 28.5           ~ 7 0
23 ASR 2 Y*O 03 29 02.8905446739 +31 16 00.956585602           M2.5V 20 0
24 V* V512 Per Or* 03 29 03.7567945196 +31 16 03.959183877           ~ 364 0
25 NAME HH 7-11 FIR 03 29 03.9 +31 16 06           ~ 339 0
26 [SDA2014] West40 Y*O 03 29 04.06 +31 14 46.5           ~ 55 0
27 [JJK2007] 23 Y*O 03 29 10.68 +31 18 20.6           ~ 33 1
28 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1279 1
29 SSTYSV J032917.11+312745.5 cor 03 29 17.17 +31 27 46.5           ~ 38 0
30 SSTc2d J032918.3+312320 Y*O 03 29 18.26 +31 23 19.9           ~ 22 1
31 SSTc2d J032923.5+313330 Y*O 03 29 23.47 +31 33 29.5           ~ 36 1
32 IRAS 03267+3128 cor 03 29 51.82 +31 39 06.0           ~ 50 0
33 IRAS 03282+3035 cor 03 31 20.98 +30 45 30.1           ~ 164 0
34 IRAS 03292+3039 cor 03 32 17.96 +30 49 47.5           ~ 63 0
35 [JJK2007] 34 Y*O 03 33 13.80 +31 20 05.3           ~ 15 0
36 [SDA2014] West50 Y*O 03 33 14.38 +31 07 10.9           ~ 27 1
37 [WBK2005] SMM 3 Y*O 03 33 16.3 +31 06 53           ~ 15 0
38 2MASS J03331667+3107548 Y*O 03 33 16.68 +31 07 54.9           ~ 106 2
39 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 178 0
40 SSTc2d J033327.2+310710 cor 03 33 27.29 +31 07 10.2           ~ 45 0
41 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1154 0
42 Cl* IC 348 LRL 54362 Y*O 03 43 50.96 +32 03 24.7           ~ 34 1
43 NAME HH 211 FIR Y*O 03 43 56.770 +32 00 49.90           ~ 16 0
44 NAME IC 348 MMS cor 03 43 56.84 +32 03 04.7           ~ 68 1
45 SSTc2d J034357.3+320047 Y*? 03 43 57.27 +32 00 47.5           ~ 3 0
46 2MASS J03435764+3200447 Y*O 03 43 57.643 +32 00 44.74           ~ 4 0
47 2MASS J03435940+3200354 Y*O 03 43 59.401 +32 00 35.43           ~ 8 0
48 Cl* IC 348 LRL 54459 Y*O 03 44 02.40 +32 02 04.9           ~ 24 1
49 Cl* IC 348 LRL 1872 Y*O 03 44 43.308 +32 01 31.57           ~ 48 1
50 IRAS 03445+3242 Y*O 03 47 41.603 +32 51 43.79           ~ 180 0
51 IRAS 04108+2803 mul 04 13 54.9 +28 11 31           ~ 89 1
52 IRAS F04110+2800 Y*O 04 14 12.28944 +28 08 37.1724           ~ 25 0
53 2MASS J04153452+2913469 Y*O 04 15 34.52616 +29 13 46.9812           K-M+? 7 0
54 NAME CoKu Tau 1 Y*O 04 18 51.4865838204 +28 20 26.105713878     19.3     K7+M 79 0
55 IRAS 04166+2706 Y*O 04 19 42.62736 +27 13 38.4312           ~ 119 0
56 IRAS 04248+2612 Y*O 04 27 57.30696 +26 19 18.3036           M 146 0
57 WISE J042838.78+265134.6 Y*O 04 28 38.78544 +26 51 34.6824           ~ 45 0
58 LDN 1521F DNe 04 28 39.3 +26 51 43           ~ 193 1
59 V* GV Tau TT* 04 29 23.7314759229 +24 33 00.216016292 19.20         K7 276 2
60 LDN 1527 DNe 04 39 53 +25 45.0           ~ 538 0
61 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3765 0
62 GSS 30 Y*O 16 26 21.38160 -24 23 04.0524           ~ 204 1
63 VSSG 30 Y*O 16 26 44.19504 -24 34 48.3492           ~ 130 0
64 WL 17 Y*O 16 27 06.77616 -24 38 14.9964           ~ 91 0
65 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 273 1
66 WL 19 Y*O 16 27 11.71416 -24 38 32.0604           ~ 68 0
67 WL 6 Y*O 16 27 21.80448 -24 29 53.3616           ~ 113 0
68 YLW 15 Y*O 16 27 26.93640 -24 40 50.8224           ~ 246 1
69 YLW 16A Y*O 16 27 28.02744 -24 39 33.5052           K8 187 0
70 YLW 45 Y*O 16 27 39.82824 -24 43 15.0672           ~ 111 0
71 YLW 52 Y*O 16 27 51.80472 -24 31 45.5304           ~ 64 0
72 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3213 1
73 IRAS 16285-2355 Y*O 16 31 35.65752 -24 01 29.4708           ~ 111 0
74 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 982 2

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2021.09.22-12:34:24

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