1998A&A...332..849F


Query : 1998A&A...332..849F

1998A&A...332..849F - Astronomy and Astrophysics, volume 332, 849-856 (1998/4-3)

The Chamaeleon infrared nebula revisited. Infrared imaging and spectroscopy of a young stellar object.

FELDT M., HENNING T., LAGAGE P.O., MANSKE V., SCHREYER K. and STECKLUM B.

Abstract (from CDS):

We are presenting spectroscopic and imaging data on the Chamaeleon Infrared Nebula (Cha IRN). Imaging was done between 1 and 2.5µm and at 10µm. Spectra of the object were obtained in the 2.1µm - 4.6µm range by ground-based measurements as well as using ISOPHOT-S in the 2.5µm - 11.6µm range. By combining these data with a K-band speckle image and IRAS-LRS data, we draw a complete picture of the source. The system's geometry, consisting of central source, disk, and bipolar outflow cavities, is determined directly from the observational data. Thereby we confirm earlier assumptions on the basic geometry of the system as well as support newer speculations by Gledhill et al. (1996) about the presence of a binary system inside the Cha IRN. Additionally, we fit a radiative transfer model to the spectral energy distribution and derive the dust composition from the ISOPHOT spectra and give the resulting abundance ratios. The spectroscopic data point to an unusually silicate-poor environment of this young stellar object or a special geometric arrangement which leads to a suppression of the feature. They also indicate one of the most prominent H2O ice features known as well as the presence of CO, CO2, and possibly NH3 ice.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: jets and outflows - accretion, accretion disks - line: identification - radiative transfer

Nomenclature: Figs 1, 2, 3: [FHL98] A (Nos A-E)

CDS comments: T.1: Sgr 9 = V* 9 Sgr?

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 18847 * 03 01 24.8689351296 -19 59 14.020643868   10.40 9.84     F5V 7 0
2 V* HL Tau Or* 04 31 38.5107609312 +18 13 57.859747968   15.89 14.49 14.39   K5 1317 0
3 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 796 0
4 NAME Cha IR Nebula TT* 11 08 38.702 -77 43 51.54           M5.5 72 0
5 * gam Lib ** 15 35 31.5788082 -14 47 22.327851 5.67 4.93 3.91 3.20 2.65 G8.5III 150 0
6 2MASS J18191220-2047297 Y*O 18 19 12.21 -20 47 29.7           B1 127 0
7 RAFGL 2136 Y*O 18 22 26.52888 -13 30 14.0400           ~ 267 0

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2022.05.24-02:26:43

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