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High Resolution CO Observations of the Bipolar Nebula CRL2688

Published online by Cambridge University Press:  04 August 2017

R. Kawabe ,
T. Kasuga ,
M. Ishiguro ,
K-I. Morita ,
N. Ukita ,
H. Kobayashi ,
S. Okumura ,
E. B. Fomalont  and
N. Kaifu
R. Kawabe
Affiliation:
Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464, Japan
T. Kasuga
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki, Minamisaku, Nagano 384-14, Japan
M. Ishiguro
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki, Minamisaku, Nagano 384-14, Japan
K-I. Morita
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki, Minamisaku, Nagano 384-14, Japan
N. Ukita
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki, Minamisaku, Nagano 384-14, Japan
H. Kobayashi
Affiliation:
Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
S. Okumura
Affiliation:
Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan
E. B. Fomalont
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki, Minamisaku, Nagano 384-14, Japan National Radio Astronomy Observatory, Edgemont Road, Charlotteville, VA 22901 USA
N. Kaifu
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki, Minamisaku, Nagano 384-14, Japan

Extract

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CRL2688 is suggested to be one of the proto-planetary nebulae which are probably at a stage in which the central star is evolving from the red giant phase with rapid mass loss (Zuckerman 1978). The bipolar shape in both the optical and H2 emission indicates that a dense toroid of dust and gas obscures the star and surrounds the optical emission. The toroid is probably responsible for channelling the mass loss to the polar directions (Ney et al. 1975, Morris 1981, Beckwith et al. 1984). We present the results of mapping observations of CO (J = 1-0) emission from the expanding molecular envelope (Zuckerman et al. 1976, Lo et al. 1976, Knapp et al. 1982, Thronson et al. 1983) of the bipolar reflection nebula CRL2688 using the Nobeyama 45-m telescope with a 1.5″ resolution at a 7″.5 observing spacing.

Type
I. Star Forming Processes in the Solar Neighborhood
Information
Symposium - International Astronomical Union , Volume 115: Star Forming Regions , 1987 , pp. 400 - 402
Copyright
Copyright © Reidel 1987 

References

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