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Evolution of Maser/IR Objects with Very Thick Dust Envelopes

Published online by Cambridge University Press:  15 December 2006

Shuji Deguchi ,
Junichi Nakashima ,
Nicolas Koning  and
Sun Kwok
Shuji Deguchi
Affiliation:
Nobeyama Radio Observatory, NAOJ, Minamimaki, Minamisaku, Nagano 384-1305, Japan
Junichi Nakashima
Affiliation:
Academia Sinica, Institute of Astronomy and Astrophysics, PO Box 23-141, Taipei, 106, Taiwan
Nicolas Koning
Affiliation:
Department of Astronomy and Physics, University of Calgary, 2500 University Drive, Calgary, AB, Canada T2N 1N4
Sun Kwok
Affiliation:
Academia Sinica, Institute of Astronomy and Astrophysics, PO Box 23-141, Taipei, 106, Taiwan Department of Astronomy and Physics, University of Calgary, 2500 University Drive, Calgary, AB, Canada T2N 1N4 University of Hong Kong, Faculty of Science, Chong Yuet Ming Physics Building, Hong Kong, China, PR
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Abstract

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Some stellar maser sources at preplanetary stage have very thick circumstellar envelopes, for which no near-infrared identifications have been made. We investigated such stars at radio/NIR/MIR wavelengths using the NRO 45-m, ANU 2.2-m, UH 2.2-m, and SUBARU 8.2-m telescopes. Furthermore, using the Spitzer/Glimpse survey of the Galactic plane, we found counterparts in the 3.6 micron band for all of the OH/IR objects without previous NIR identification. One of the most interesting objects among these is IRAS 18450–0148 (W43A) with collimated outflows. Their spectra indicate that they have massive thick disks.

Keywords

preplanetary nebulaemaserscircumstellar envelope
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S234: Planetary Nebulae in our Galaxy and Beyond , April 2006 , pp. 385 - 386
Copyright
© 2006 International Astronomical Union