2006A&A...449..251T


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.11CEST12:54:01

2006A&A...449..251T - Astronomy and Astrophysics, volume 449, 251-265 (2006/4-1)

VLT-ISAAC 3-5 µm spectroscopy of embedded young low-mass stars. III. Intermediate-mass sources in Vela.

THI W.-F., VAN DISHOECK E.F., DARTOIS E., PONTOPPIDAN K.M., SCHUTTE W.A., EHRENFREUND P., D'HENDECOURT L. and FRASER H.J.

Abstract (from CDS):

We study in this paper the ice composition in the envelope around intermediate-mass class I Young Stellar Objects (YSOs). We performed a spectroscopic survey toward five intermediate-mass class I YSOs located in the Southern Vela molecular cloud in the L (2.85-4.0µm) and M (4.55-4.8µm) bands at resolving powers λ/Δλ=600-800 up to 10000, using the Infrared Spectrometer and Array Camera mounted on the Very Large Telescope-ANTU. Lower mass companion objects were observed simultaneously in both bands. Solid H2O at 3µm is detected in all sources, including the companion objects. CO ice at 4.67µm is detected in a few main targets and one companion object. One object (LLN 19) shows little CO ice but strong gas-phase CO ro-vibrational lines in absorption. The CO ice profiles are different from source to source. The amount of water ice and CO ice trapped in a water-rich mantle may correlate with the flux ratio at 12 and 25µm. The abundance of H2O-rich CO likely correlates with that of water ice. A weak feature at 3.54µm attributed to solid CH3OH and a broad feature near 4.62µm are observed toward LLN 17, but not toward the other sources. The derived abundances of solid CH3OH and OCN are ∼10±2% and ∼1±0.2% of the H2O ice abundance respectively. The H2O optical depths do not show an increase with envelope mass, nor do they show lower values for the companion objects compared with the main protostar. The line-of-sight CO ice abundance does not correlate with the source bolometric luminosity. Comparison of the solid CO profile toward LLN 17, which shows an extremely broad CO ice feature, and that of its lower mass companion at a few thousand AU, which exhibits a narrow profile, together with the detection of OCN toward LLN 17 provide direct evidences for local thermal processing of the ice.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - astrochemistry - ISM: molecules

Nomenclature: Table 2: [TVD2006] NNb (Nos 8b, 13b, 17b, 41b) = [TVD2006] IRAS HHMMm+DDMMb N=4.

CDS comments: Fig.8 Cham Irn not identified.

Simbad objects: 33

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Number of rows : 33

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 1489 DNe 04 04 47.5 +26 19 42           ~ 196 0
2 Kim 1-38 * 04 39 38.8673861844 +26 11 26.630421918           K1III 124 0
3 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3503 0
4 [LHR84] GL 961W Y*O 06 34 37.4045464572 +04 12 42.491273796           ~ 18 0
5 RAFGL 961 Y*O 06 34 37.741 +04 12 44.20           ~ 235 1
6 RAFGL 989 Y*O 06 41 10.1592954288 +09 29 33.635497596   17.4 16.8 18.26 17.28 B2 241 0
7 * rho Pup dS* 08 07 32.6488235 -24 18 15.567946 3.43 3.24 2.81 2.46 2.25 F5IIkF2IImF5II 276 0
8 IRAS 08211-4158 IR 08 22 52.08 -42 07 53.7           ~ 24 0
9 [TVD2006] 8b IR 08 22 52.8 -42 07 26           ~ 1 0
10 NAME Pup A SNR 08 24 07 -42 59.8           ~ 521 1
11 2MASS J08254384-5100326 Y*O 08 25 43.85 -51 00 32.7           ~ 298 1
12 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1116 2
13 [TVD2006] 13b IR 08 39.3 -41 20           ~ 1 0
14 IRAS 08375-4109 HII 08 39 20.4 -41 19 53           ~ 15 0
15 IRAS 08448-4343 cor 08 46 33.8 -43 54 33           ~ 57 1
16 [TVD2006] 17b IR 08 46.6 -43 54           ~ 1 0
17 IRAS 08470-4321 cor 08 48 48.2 -43 32 25           ~ 42 0
18 IRAS 08476-4306 cor 08 49 25.9 -43 17 10           ~ 27 0
19 NAME Vela Jr SN SNR 08 52.0 -46 20           ~ 403 2
20 [MHL2007] G264.9032+01.6584 1 Y*? 08 59 26.41 -43 26 13.4           ~ 10 0
21 IRAS 09014-4736 Y*? 09 03 09.4909851768 -47 48 27.777958701           ~ 23 1
22 IRAS 09017-4716 Y*? 09 03 25.0188145205 -47 28 27.884269453           ~ 10 0
23 [TVD2006] 41b IR 09 03 25.3 -47 28 40           ~ 1 0
24 IRAS 09017-4813 IR 09 03 25.4 -48 25 47           ~ 4 0
25 IRAS 09017-4814 * 09 03 25.5 -48 26 29           K0III 9 1
26 NAME Vela B MoC 09 04 -48.0           ~ 25 0
27 HH 75 HH 09 11 38.5 -45 42 28           ~ 19 0
28 NAME Vela A MoC 09 18 -48.0           ~ 26 0
29 * y Vel Pe* 09 38 01.4522425087 -43 11 27.365564591 7.18 6.50 5.50     G8IIIBa1.5 117 0
30 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 267 1
31 W 33a Y*O 18 14 39.0 -17 52 03           ~ 584 0
32 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 918 2
33 RAFGL 7009S HII 18 34 20.911 -05 59 42.23           ~ 193 0

    Equat.    Gal    SGal    Ecl

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2020.08.11-12:54:01

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