2003A&A...401..613A

Query : 2003A&A...401..613A

2003A&A...401..613A - Astronomy and Astrophysics, volume 401, 613-624 (2003/4-2)

ISOCAM-CVF spectroscopy of the circumstellar environment of young stellar objects.

ALEXANDER R.D., CASALI M.M., ANDRE P., PERSI P. and EIROA C.

Abstract (from CDS):

We present the results of a mid-infrared (5-16.5µm) imaging spectroscopy survey of Young Stellar Objects (YSOs) and their surrounding environment in four low-mass star formation regions: R CrA, ρ Ophiuchi, Serpens and Chamaeleon I. This survey was performed using ISOCAM and its Circular Variable Filters (CVF) and observed 42 YSO candidates: we were able to obtain complete 5-16.5µm spectra for 40 of these with a spectral resolving power of λ/Δλ≃40. A number of spectral features were measured, most notably the 9.7µm silicate feature, the bending modes of both water and CO2 ices at 6.0 and 15.2µm respectively and the well-known unidentified feature at 6.8µm. The strength of the unidentified feature was observed to correlate very well with that of the water ice bending mode and far less strongly with the CO2 ice bending mode. This suggests, in a manner consistent with previous observations, that the carrier of the unidentified feature is a strongly polar ice. Absorption profiles of the bending mode of CO2 ice are observed to show a significant long wavelength wing, which suggests that a significant fraction of the CO2 ice observed exists in a polar (H2O-rich) phase. The sources observed in R CrA, ρ Oph and Serpens show similar spectral characteristics, whilst the sources observed in Cha I are somewhat anomalous, predominantly showing silicate emission and little or no absorption due to volatile ices. However this is consistent with previous studies of this region of the Cha I cloud, which contains an unusual cluster of YSOs. From comparisons of the strengths of the water ice and silicate bands we detect an apparent under-abundance of water ice towards the sources in ρ Oph, relative to both R CrA and Serpens. This may be indicative of differences in chemical composition between the different clouds, or may be due to evaporation. Finally the CO2:H2O ice ratios observed towards the sources in ρ Oph show significantly greater scatter than in the other regions, possibly due to varying local conditions around the YSOs in ρ Oph.

Abstract Copyright: ∼

Journal keyword(s): ISM: dust, extinction - stars: circumstellar matter - stars: pre-main-sequence - ISM: molecules - ISM: lines and bands - infrared: ISM

VizieR on-line data: <Available at CDS (J/A+A/401/613): table1.dat notes.dat refs.dat>

Nomenclature: Table 1: [ACA2003] R CrA N (Nos 1-7), [ACA2003] rho Oph A N (Nos 1-4), [ACA2003] rho Oph E N (Nos 1-6), [ACA2003] Ser A N (Nos 1-7), [ACA2003] Ser B NN (Nos 1-13), [ACA2003] Cha I N (Nos 1-6).

Simbad objects: 61

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Number of rows : 61
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1154 1
2 V* HV Cha Or* 11 09 22.6489972128 -76 34 32.164757616         16.79 M0.75-M1.75 53 0
3 V* GM Cha Or* 11 09 28.55424 -76 33 28.1376           M3.5-M6.5 52 0
4 V* HW Cha Or* 11 09 41.9146999920 -76 34 58.572141600           M0- 34 0
5 HJM C 1-24 TT* 11 09 46.1881553592 -76 34 46.503994080   11.93 18.41   14.72 M3.25e 62 1
6 HD 97300 Ae* 11 09 50.0199904704 -76 36 47.718191232   9.41 9.20   8.82 B9V 176 1
7 Ass Cha T 1-23 Or* 11 09 53.4189070920 -76 34 25.652641116   13.9 19.50 15.10 13.52 G9IIIe 96 0
8 V* WW Cha Or* 11 10 00.0802739160 -76 34 57.963853416   14.74 14.10   10.95 ~ 154 0
9 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 648 0
10 CRBR 2315.8-1700 Y*O 16 26 17.22936 -24 23 45.3660           ~ 43 0
11 CRBR 2317.5-1729 Y*O 16 26 18.98232 -24 24 14.2596           M6 47 0
12 GSS 30 Y*O 16 26 21.38160 -24 23 04.0524           ~ 210 1
13 [GY92] 21 Y*O 16 26 23.57976 -24 24 39.4956           K7 71 2
14 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 289 1
15 NAME rho Oph E MoC 16 27 02.0 -24 38 31           ~ 63 0
16 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 283 1
17 NAME rho Oph B Cloud MoC 16 27 11 -24 28.5           ~ 84 1
18 YLW 13B Y*O 16 27 21.46872 -24 41 43.0692           ~ 91 0
19 CRBR 2422.8-3423 Y*O 16 27 24.61320 -24 41 03.4080           ~ 91 1
20 YLW 16C Or* 16 27 26.48952 -24 39 23.0760           M1 56 0
21 YLW 15 Y*O 16 27 26.906 -24 40 50.81           ~ 268 1
22 [ACA2003] rho Oph E4 IR 16 27 27.1 -24 41 31           ~ 1 0
23 YLW 16A Y*O 16 27 28.02744 -24 39 33.5052           K8 194 0
24 NAME rho Oph F MoC 16 27 37.3 -24 42 28           ~ 63 0
25 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3629 1
26 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 696 0
27 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1100 2
28 [ACA2003] Ser B 1 Y*O 18 29 52.85 +01 14 56.1           ~ 18 1
29 2MASS J18295571+0114315 Y*O 18 29 55.711 +01 14 31.50           ~ 39 0
30 NAME Ser Nebula RNe 18 29 56 +01 14.8           ~ 29 1
31 2MASS J18295655+0112596 Y*O 18 29 56.553 +01 12 59.65           ~ 23 0
32 2MASS J18295667+0112393 Y*O 18 29 56.674 +01 12 39.32           ~ 20 0
33 HBC 672 Em* 18 29 56.8848005064 +01 14 46.304766672   17.6       K8.0 102 0
34 [ACA2003] Ser B 4 IR 18 29 57.2 +01 13 28           ~ 1 0
35 2MASS J18295741+0114503 Y*O 18 29 57.4127920080 +01 14 50.197813116           M2.0 17 0
36 [ACA2003] Ser A 3 IR 18 29 57.5 +01 12 57           ~ 1 3
37 [EC89] SVS 4-5 Y*O 18 29 57.59 +01 13 00.6           ~ 35 1
38 2MASS J18295760+0113004 Y*O 18 29 57.602 +01 13 00.42           ~ 36 3
39 IRAS 18274+0112 Y*O 18 29 57.73680 +01 14 05.6940           M4: 139 2
40 2MASS J18295781+0115318 Y*O 18 29 57.816 +01 15 31.86           K2.0 22 0
41 2MASS J18295781+0112280 Y*O 18 29 57.819 +01 12 28.05           ~ 21 0
42 NAME Serpens SVS 4 IR Cluster Cl* 18 29 57.84 +01 12 48.1           ~ 43 1
43 2MASS J18295784+0112379 Y*O 18 29 57.849 +01 12 37.90           ~ 23 0
44 2MASS J18295785+0112514 Y*O 18 29 57.858 +01 12 51.40           ~ 60 3
45 [EC92] 95 Y*O 18 29 57.893 +01 12 46.25           K1.0 73 3
46 [ACA2003] Ser B 7 IR 18 29 58.1 +01 13 24           ~ 1 0
47 2MASS J18295820+0115216 Y*O 18 29 58.2037073472 +01 15 21.610474308           K7.0 40 0
48 2MASS J18295876+0114257 Y*O 18 29 58.765 +01 14 25.78           ~ 25 1
49 CK 8 TT* 18 29 59.2453548960 +01 14 07.611180936   19.7   16.9   K7.5 31 0
50 CK 2 Y*O 18 30 00.618 +01 15 20.12           K5-M0III 52 0
51 [ACA2003] Ser A 7 cor 18 30 00.68 +01 13 01.2           ~ 18 1
52 2MASS J18300209+0113587 Y*O 18 30 02.095 +01 13 58.79           ~ 22 0
53 [ACA2003] R CrA 2 IR 19 01 41.5 -36 58 59           ~ 1 0
54 [TS84] IRS 2 Y*O 19 01 41.569 -36 58 31.23           K2 85 0
55 2MASS J19014164-3659528 Y*O 19 01 41.6426330712 -36 59 52.868573844   17.7 16.7     M2 32 0
56 2MASS J19014805-3657219 Y*O 19 01 48.056 -36 57 21.95           ~ 102 0
57 V* V710 CrA Or* 19 01 50.67792 -36 58 09.6132           K7: 125 0
58 [ACA2003] R CrA 6 IR 19 01 50.9 -36 57 37           ~ 1 0
59 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 490 0
60 [ACA2003] R CrA 7 IR 19 01 52.4 -36 57 37           ~ 1 0
61 V* R CrA Ae* 19 01 53.6764322232 -36 57 08.299341828 12.781 12.651 11.917 11.242 10.412 B5IIIpe 478 1

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