2009A&A...506.1229C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:58:13

2009A&A...506.1229C - Astronomy and Astrophysics, volume 506, 1229-1241 (2009/11-2)

Physical structure and water line spectrum predictions of the intermediate mass protostar OMC2-FIR4.

CRIMIER N., CECCARELLI C., LEFLOCH B. and FAURE A.

Abstract (from CDS):

Intermediate mass (IM) stars are an important component of our Galaxy, as they significantly contribute to the interstellar FUV field and, consequently, play an important role in the energy balance of the ISM. Despite their importance, very little is known about their formation process and only a few studies have been devoted to characterizing the first phases in the evolution of IM protostars. Here we consider in great detail the case of the brightest and closest known young IM protostar: FIR4 in the OMC2 component of the Orion molecular cloud complex. We analyzed the available continuum emission (maps and SED) through one-dimensional dust radiative transfer calculations. We ran large grids of models to find the envelope model that reproduces the data best. The derived dust density and temperature profiles were then used to compute the gas temperature profile, equating gas cooling and heating terms across the envelope. Finally, we computed the water line spectrum for various possible values of water abundance. The luminosity of FIR4 has been reevaluated to 1000L, making FIR4 definitively an IM protostar. The envelope surrounding FIR4 has a relatively shallow density power-law index, ∼0.6. The most surprising result is that the gas and dust are thermally decoupled in the interior of the envelope, where the dust ices sublimate at 100K. This has important consequences in the interpretation of the line data. We provide the predictions for the water spectrum, and discuss in detail the lines that will be observed by the Herschel Space Observatory

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: molecules - stars: formation

Simbad objects: 10

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Number of rows : 10

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 LDN 1527 DNe 04 39 53 +25 45.0           ~ 495 0
2 M 42 HII 05 35 17.3 -05 23 28           ~ 3724 0
3 NAME OMC 2 IRS 3 HII 05 35 26.00 -05 10 16.6           ~ 61 0
4 V* V2457 Ori Or* 05 35 26.97000 -05 09 54.4644         18.858 ~ 112 0
5 OMC 2 MoC 05 35 27 -05 10.1           ~ 383 1
6 2MASS J05352762-0509337 Y*O 05 35 27.622 -05 09 33.78           ~ 71 0
7 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 848 1
8 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1035 1
9 LDN 483 DNe 18 17 35 -04 39.8           ~ 209 0
10 RAFGL 7009S HII 18 34 20.911 -05 59 42.23           ~ 193 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:58:13

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