1998ApJ...509..283G


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.06CEST14:45:38

1998ApJ...509..283G - Astrophys. J., 509, 283-298 (1998/December-2)

Mid-infrared imaging of Orion BN/KL. II. Luminosity sources, extinction distribution, and the nature of IRc2.

GEZARI D.Y., BACKMAN D.E. and WERNER M.W.

Abstract (from CDS):

We have recalculated the luminosities of IRc2 and the BN Object in the Orion BN/KL complex and determined the distributions of color temperature and silicate absorption-line strength over the region with much greater precision than before, using a complete set of well-sampled and nearly diffraction-limited array camera images of BN/KL at nine wavelengths between 4.8 and 20 µm. We find that the total infrared luminosity of IRc2 itself is only L ∼ 1000 L (much lower than the generally accepted value). However, the temperature and extinction distributions show that the significant luminosity source(s) in BN/KL must still be located within several arcseconds of IRc2. Our results, considered with recent radio continuum and maser emission observations, suggest that a luminous early-type star located at radio source ``I'' is embedded close to IRc2, obscured by ∼60 mag of visual extinction from dust grains both local to IRc2 and in intervening clouds along the line of sight. The combined heating contributions of the hot stars ionizing the compact H II regions ``I'' (near IRc2), ``B'' (the BN Object), and ``L'' (infrared source ``n''), compact IRc objects (including 10 new peaks resolved here), and distributed near-infrared sources can account for the observed ∼105 L total luminosity of the BN/KL complex.

Abstract Copyright:

Journal keyword(s): {em headings:} infrared: ISM: continuum - ISM: Individual: Name: Orion-BN - ISM: Individual: Name: Orion Kleinmann-Low

Nomenclature: Table 2: [RLK73] IRc NWW (Nos 4NW and 6N), [RLK73] IRc NN (Nos 11-18).

Status at CDS:  

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 MLLA 602 * 05 35 13.9700 -05 22 31.900           ~ 53 0
2 [FW2011] J053514.096-052226.734 IR 05 35 14.096 -05 22 26.73           ~ 6 0
3 V* V2254 Ori Or* 05 35 14.113 -05 22 22.73           B 282 2
4 [GD77] B IR 05 35 14.15 -05 22 37.4           ~ 30 0
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1977 1
6 [RLK73] IRc 6 IR 05 35 14.18 -05 22 26.7           ~ 36 0
7 [GD77] A IR 05 35 14.19 -05 22 34.0           ~ 58 0
8 [FW2011] J053514.278-052230.647 IR 05 35 14.278 -05 22 30.65           ~ 68 0
9 [RLK73] IRc 17 IR 05 35 14.28 -05 22 20.1           ~ 7 0
10 [CBA97] 8 * 05 35 14.33 -05 22 25.2           ~ 13 0
11 NAME Ori N Y*O 05 35 14.35371 -05 22 32.8820           ~ 102 0
12 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 112 0
13 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 568 1
14 [RLK73] IRc 8 IR 05 35 14.68 -05 22 35.1           ~ 8 0
15 [RLK73] IRc 11 IR 05 35 14.71 -05 22 30.8           ~ 8 0
16 [RLK73] IRc 12 IR 05 35 14.81 -05 22 31.3           ~ 10 0
17 MLLA 646 IR 05 35 15.08 -05 22 30.1           ~ 8 0
18 [RLK73] IRc 13 IR 05 35 15.09 -05 22 27.7           ~ 6 0
19 NAME Ney-Allen Nebula ISM 05 35 17.1 -05 23 18           ~ 26 0
20 * tet01 Ori D Y*O 05 35 17.2574309230 -05 23 16.567215876 6.08 6.79 6.70 6.40 6.20 B1.5Vp 304 0
21 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1384 0
22 [RLK73] IRc 16 IR ~ ~           ~ 5 0
23 [RLK73] IRc 18 IR ~ ~           ~ 2 0
24 [RLK73] IRc 4NW IR ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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