J/A+A/483/839 CO(2-1) maps of IRAS 18059-3211 (Bujarrabal+, 2008)
Gomez's Hamburger (IRAS 18059-3211): A pre main-sequence A-type star.
Bujarrabal V., Young K., Fong D.
<Astron. Astrophys. 483, 839 (2008)>
=2008A&A...483..839B 2008A&A...483..839B
ADC_Keywords: Nebulae ; Stars, pre-main sequence ; Carbon monoxide
Keywords: stars: circumstellar matter - stars: AGB and post-AGB -
stars: formation - stars: individual: Gomez's Hamburger
Abstract:
We study the nature of Gomez's Hamburger (IRAS 18059-3211), a nebula
that has been proposed to be a post-AGB object. Such a classification
has not been confirmed; instead, we argue that it will be a key object
in the study of disks rotating around young stars.
We present high-resolution SMA maps of CO J=2-1 (230.538GHz) in
Gomez's Hamburger. The data are analyzed by means of a code that
simulates the emission of a nebula showing a variety of physical
conditions and kinematics.
Our observations clearly show that the CO emitting gas in Gomez's
Hamburger forms a spectacular disk in keplerian rotation. Model
calculations undoubtedly confirm this result. The central (mainly
stellar) mass is found to be high, ∼4 solar masses for a distance of
500pc. The mass and (relatively low) luminosity of the source are,
independent of the assumed distance, very different from those
possible in evolved stars. This object is probably transitional
between the pre-MS and MS phases, still showing interstellar material
around the central star or stellar system.
Description:
Three fits files, respectively containing: maps of CO J=2-1 flux per
velocity channel, map of velocity-averaged line flux, and map of
continuum flux at 1.3mm wavelength. These data correspond to Fig.1 of
the paper.
Objects:
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RA (2000) DE Designation(s)
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18 09 13.3 -32 10 48 Gomez's hamburger = IRAS 18059-3211
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
maps.dat 86 3 Maps list
fits/* . 3 Fits files
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Byte-by-byte Description of file: maps.dat
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Bytes Format Units Label Explanations
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1- 31 A31 --- FileName Name of the file in subdirectory fits
33- 86 A54 --- Title Title and characteristics of the file
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Acknowledgements:
Valentin Bujarrabal, v.bujarrabal(at)oan.es
(End) Patricia Vannier [CDS] 27-Mar-2008