Gomez's Hamburger (IRAS 18059-3211): A pre main-sequence A-type star

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 is not 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 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 undoubtly confirm this result. The central (mainly stellar) mass is found to be high, ~ 4 Mo for a distance of 500 pc. The mass and (relatively low) luminosity of the source are, independent of the assumed distance, very different from those possible in evolved stars. Gomez's Hamburger is probably a transitional object between the pre-MS and MS phases, still showing interstellar material around the central star or stellar system.

8 pages, 4 figures, + aa.cls + bbl file; typos + language corrections

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• VISION - Vienna survey in Orion. III. Young stellar objects in Orion A
• Detection of Keplerian dynamics in a disk around the post-AGB star AC Her
• Emission from Very Small Grains and PAH Molecules in Monte Carlo Radiation Transfer Codes: Application to the Edge-On Disk of Gomez's Hamburger
• Microwave Observations of Edge-on Protoplanetary Disks: Program Overview and First Results
• A Three Dimensional View of Gomez's Hamburger
• Disentangling protostellar evolutionary stages in clustered environments using Spitzer-IRS spectra and comprehensive SED modeling
• A large, massive, rotating disk around an isolated young stellar object
• The physical conditions in Gomez's Hamburger (IRAS 18059-3211), a pre-MS rotating disk
• High-resolution Pan-STARRS and SMA observations of IRAS 23077+6707: A giant edge-on protoplanetary disk
• Very Large Telescope observations of Gomez's Hamburger: Insights into a young protoplanet candidate