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Astron. Astrophys. 325, 277-281 (1997)

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Spectroscopy of the protoplanetary nebula AFGL 618

M. Baessgen 1, W. Hopfensitz 1 and J. Zweigle 2

1 Institut für Astronomie und Astrophysik, Abteilung Astronomie, Universität Tübingen, Waldhäuserstr. 64, D-72076 Tübingen, Germany
2 Institut de Radio Astronomie Millimétrique (IRAM), 300 Rue de la Piscine, F-38406 Saint Martin d'Héres, France

Received 30 September 1996 / Accepted 16 January 1997

Abstract

We report on new optical spectroscopic observations of the protoplanetary nebula AFGL 618. Compared to older observations we find a change in some emission line ratios indicating dynamical evolutionary processes during the last few years. Possible reasons for this behaviour are discussed.

Key words: planetary nebulae: AFGL 618 – stars: AGB – post: AGB

Send offprint requests to: M. Baessgen

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998

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