2002A&A...395..863C


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST14:24:36

2002A&A...395..863C - Astronomy and Astrophysics, volume 395, 863-871 (2002/12-1)

Submm/FIR CO line emission from the disk of the Class I protostar EL 29.

CECCARELLI C., BOOGERT A.C.A., TIELENS A.G.G.M., CAUX E., HOGERHEIJDE M.R. and PARISE B.

Abstract (from CDS):

We present observations towards the Class I protostar EL 29 of the CO J=6->5 and J≥15 transitions obtained with JCMT and ISO LWS respectively, and of five H2 rotational lines obtained with ISO SWS. The simultaneous analysis of these observations reveals the presence of a warm gas component at about 170-250K, ∼550AU in size, and whose density is ≥106cm–3. The mass of the warm gas is ∼8-24x10–4M. These values compare extremely well with the predictions of the temperature and mass of the flaring disk surrounding EL 29, probed by the dust continuum. We propose that the observed FIR CO emission originates in the super-heated surface layer of the disk of EL 29 and discuss its characteristics. We find that the CO abundance in the disk is large, ≥10–4, implying no depletion or photodissociation and we present arguments in favor of the idea that the dust has settled on the midplane disk of EL 29 and that it is thermally decoupled from the gas. We compare the characteristics of the El 29 disk with those of the disks observed in other Herbig AeBe stars using recent studies of H2 rotational line emission. The gas temperature and mass derived for the disk of EL 29 are similar to the disks of the previously studied sample. In EL 29, as in Herbig AeBe stars, the gas and dust are probably thermally decoupled. Finally, the upper limit on the H2O emission that we obtain suggests that water is not an important coolant of the disk gas, in agreement with theoretical water abundance predictions. The present study challenges previous claims that the FIR CO line emission observed in sources similar to EL 29 originates in shocks.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: lines and bands - ISM: individual objects: EL 29 - stars: circumstellar matter

CDS comments: p. 870 : NGC 133 is a misprint for NGC 1333 ??

Simbad objects: 17

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Number of rows : 17

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 1448 DNe 03 22.5 +30 35           ~ 467 0
2 IRAS 03225+3034 IR 03 25 36.49 +30 45 22.2           ~ 150 1
3 LDN 1448NA smm 03 25 36.49 +30 45 22.2           ~ 171 1
4 SSTc2d J032536.4+304522 Y*O 03 25 36.49 +30 45 22.2           ~ 187 1
5 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 242 1
6 NAME LDN 1448-mm Y*O 03 25 38.83 +30 44 06.2           ~ 302 0
7 IRAS 03258+3104 Y*O 03 28 55.30 +31 14 27.8           ~ 158 1
8 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 392 3
9 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 599 1
10 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 465 0
11 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 555 0
12 IRAS 04016+2610 Y*O 04 04 43.07064 +26 18 56.3904           ~ 236 0
13 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 934 2
14 HH 54B HH 12 55 50.3 -76 56 23           ~ 30 0
15 NAME rho Oph Complex reg 16 25 -23.5           ~ 76 1
16 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 267 1
17 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1042 1

    Equat.    Gal    SGal    Ecl

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2020.08.14-14:24:36

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