2016ApJ...825...91L

Query : 2016ApJ...825...91L

2016ApJ...825...91L - Astrophys. J., 825, 91-91 (2016/July-2)

Protostars at low extinction in Orion A.

LEWIS J.A. and LADA C.J.

Abstract (from CDS):

In the list of young stellar objects (YSOs) compiled by Megeath et al. for the Orion A molecular cloud, only 44 out of 1208 sources found projected onto low extinction ( {A}_{K}\lt 0.8 mag) gas are identified as protostars. These objects are puzzling because protostars are not typically expected to be associated with extended low extinction material. Here, we use high resolution extinction maps generated from Herschel data, optical/infrared and Spitzer Space Telescope photometry and spectroscopy of the low extinction protostellar candidate sources to determine if they are likely true protostellar sources or contaminants. Out of 44 candidate objects, we determine that 10 sources are likely protostars, with the rest being more evolved YSOs (18), galaxies (4), false detections of nebulosity and cloud edges (9), or real sources for which more data are required to ascertain their nature (3). We find none of the confirmed protostars to be associated with recognizable dense cores and we briefly discuss possible origins for these orphaned objects.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: star formation - stars: protostars

VizieR on-line data: <Available at CDS (J/ApJ/825/91): table1.dat>

Simbad objects: 55

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Number of rows : 55
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 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
2 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
3 [MGM2012] 1369 Y*O 05 32 54.30 -05 37 14.8           ~ 5 0
4 2MASS J05332592-0512027 G 05 33 25.9204142328 -05 12 02.733398820           ~ 7 0
5 2MASS J05334392-0613463 Y*O 05 33 43.9390204752 -06 13 46.308989532           ~ 8 0
6 V* V1896 Ori Or* 05 33 45.8790915000 -05 32 58.086797568           ~ 14 0
7 [MGM2012] 1983 IR 05 33 56.01 -05 20 40.7           ~ 4 1
8 [MGM2012] 1760 IR 05 34 04.85 -05 24 45.5           ~ 4 1
9 [MGM2012] 1313 IR 05 34 07.87 -05 40 40.5           ~ 4 1
10 [MGM2012] 1203 IR 05 34 16.56 -05 47 38.5           ~ 4 1
11 [MGM2012] 1839 IR 05 34 20.70 -05 23 23.3           ~ 5 1
12 [MGM2012] 730 Y*O 05 34 32.6169775560 -06 57 10.850688540           ~ 5 0
13 V* V1987 Ori Or* 05 34 35.1669879552 -04 52 17.998574196           ~ 20 0
14 V* V2001 Ori Or* 05 34 39.8855032296 -06 25 14.094579504     16.554   15.66277 G6.0 24 0
15 2MASS J05344563-0526553 Y*O 05 34 45.6324568272 -05 26 55.310435268   19.746 18.678 17.45 16.593 ~ 12 0
16 2MASS J05345193-0655489 G 05 34 51.9509338728 -06 55 49.020645756           ~ 5 0
17 NAME f-Shaped Filament in Orion Cld 05 35.0 -05 30           ~ 133 0
18 2MASS J05350675-0450016 Y*O 05 35 06.75 -04 50 01.6           ~ 8 0
19 HOPS 381 IR 05 35 07.57 -05 41 54.9           ~ 5 1
20 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
21 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
22 2MASS J05351723-0540271 Y*O 05 35 17.2448296776 -05 40 27.364388592     21.732   18.498 ~ 10 0
23 2MASS J05351965-0533013 Y*O 05 35 19.655 -05 33 01.35     21.03 20.54 18.907 ~ 11 0
24 2MASS J05352169-0537575 Y*O 05 35 21.6880027032 -05 37 57.679869072   19.434 18.517   16.729 ~ 13 0
25 V* V2391 Ori Or* 05 35 22.6165037880 -05 44 29.408033328           ~ 12 0
26 V* V2408 Ori Or* 05 35 23.3482119888 -04 40 10.293395232     18.78   16.05 M3.4 32 0
27 [MGM2012] 1220 IR 05 35 23.47 -05 46 06.1           ~ 4 1
28 V* V2514 Ori Or* 05 35 32.2969043400 -04 46 48.456365016           ~ 20 0
29 V* V2575 Ori Or* 05 35 42.4088223480 -04 42 57.133332432           ~ 9 0
30 [MGM2012] 1453 IR 05 35 43.83 -05 33 41.2           ~ 4 1
31 TKK 1195 Y*O 05 35 45.0737883528 -05 13 55.596762480   21.951 20.669   17.867 M4V 10 1
32 V* CG Ori TT* 05 35 50.9606052672 -06 22 43.680472032     17.237   14.11883 M1.0 41 0
33 2MASS J05355574-0504375 Or* 05 35 55.7450777760 -05 04 37.756070004           ~ 14 0
34 2MASS J05360005-0607142 Y*O 05 36 00.0459084600 -06 07 14.255225544           ~ 8 0
35 [MGM2012] 1858 IR 05 36 04.50 -05 23 05.5           ~ 4 1
36 [MGM2012] 564 Y*O 05 36 10.7521535664 -07 24 28.272792708           ~ 5 0
37 2MASS J05362173-0541578 rG 05 36 21.734 -05 41 57.86           ~ 8 0
38 2MASS J05362197-0531144 Y*O 05 36 21.973 -05 31 14.46         21.029 ~ 6 0
39 [AD95] 252 Or* 05 36 24.3725431776 -05 34 50.161592460         15.189 K5-K6 28 0
40 V* V2688 Ori Or* 05 36 30.3394098840 -04 32 17.075033196           ~ 9 0
41 2MASS J05363476-0711133 G 05 36 34.767 -07 11 13.39           ~ 9 0
42 [MGM2012] 1513 IR 05 36 40.14 -05 31 13.8           ~ 4 1
43 V* V846 Ori Or* 05 36 41.3690944584 -06 34 00.750817740   16.370 15.166 14.626 13.12681 M0 56 0
44 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
45 2MASS J05385501-0656185 TT* 05 38 55.0152356256 -06 56 18.461055156     20.635   18.240 F5 14 0
46 V* V995 Ori Or* 05 40 09.8144861280 -07 09 54.316749420     17.0     M2.3 34 0
47 [MGM2012] 200 Y*O 05 40 25.73 -08 46 51.7           ~ 5 0
48 2MASS J05402943-0928076 Y*? 05 40 29.4363082032 -09 28 07.414793076           ~ 4 1
49 2MASS J05420088-0925154 Y*O 05 42 00.883 -09 25 15.50           ~ 5 0
50 2MASS J05423081-0809055 TT* 05 42 30.81432 -08 09 05.5944     18.934   15.273 M2.8 20 0
51 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
52 NAME Rosette Molecular Cloud MoC 06 34.7 +04 02           ~ 277 0
53 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
54 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
55 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 336 1

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