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SMA Spectral Line Survey of the Proto-Planetary Nebula CRL 618

Published online by Cambridge University Press:  30 December 2019

Nimesh A. Patel ,
Carl Gottlieb ,
Ken Young ,
Tomasz Kaminski ,
Michael McCarthy ,
Karl Menten ,
Chin-Fei Lee  and
Harshal Gupta
Nimesh A. Patel
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA, USA
Carl Gottlieb
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA, USA
Ken Young
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA, USA
Tomasz Kaminski
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA, USA
Michael McCarthy
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge MA, USA
Karl Menten
Affiliation:
Max Planck Institute for Radio Astronomy, Bonn, Germany
Chin-Fei Lee
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, Taipei, Taiwan
Harshal Gupta
Affiliation:
National Science Foundation, Washington DC, USA
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Abstract

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Carbon-rich Asymptotic Giant Branch (AGB) stars are major sources of gas and dust in the interstellar medium. During the brief (∼1000 yr) period in the evolution from AGB to the Planetary Nebula (PN) stage, the molecular composition evolves from mainly diatomic and small polyatomic species to more complex molecules. Using the Submillimeter Array (SMA), we have carried out a spectral line survey of CRL 618, covering a frequency range of 281.9 to 359.4 GHz. More than 1000 lines were detected in the ∼60 GHz range, most of them assigned to HC3N and c-C3H2, and their isotopologues. About 200 lines are unassigned. Lines of CO, HCO+, and CS show the fast outflow wings, while the majority of line emission arises from a compact region of ∼1” diameter. We have analyzed the lines of HC3N, c-C3H2, CH3CN, and their isotopologues with rotation temperature diagrams.

Keywords

(stars:) circumstellar mattermolecular processesstars: AGB and post-AGBsubmillimeterstars: individual (CRL 618)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 483 - 484
Copyright
© International Astronomical Union 2019 

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