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Title:
Optical and infrared observations of four suspected proto-planetary objects
Authors:
Le Bertre, T.; Heydari-Malayeri, M.; Epchtein, N.; Gouiffes, C.; Perrier, C.
Affiliation:
AA(European Southern Observatory, Garching bei München, Germany; Paris, Observatoire, Meudon, France), AB(European Southern Observatory, Garching bei München, Germany; Paris, Observatoire, Meudon, France), AC(Paris, Observatoire, Meudon, France), AD(European Southern Observatory, Garching bei München, Germany), AE(Lyon, Observatoire, Saint-Genis-Laval, France)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 225, no. 2, Nov. 1989, p. 417-431. (A&A Homepage)
Publication Date:
11/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Infrared Astronomy, Planetary Nebulae, Protoplanets, Stellar Spectrophotometry, Visual Observation, Asymptotic Giant Branch Stars, Infrared Astronomy Satellite, Spectral Energy Distribution, Stellar Evolution
Bibliographic Code:
1989A&A...225..417L

Abstract

New observations of the suspected protoplanetary objects Hen1044, Hen1191, Hen1379, and OH/IR17.7-2.0 are presented. In the near-IR, Hen1191 and Hen1379 are irregularly variable while OH/IR17,7-2.0 might be variable with a period of about 800 days. Hen1044 shows no evidence of variability. The energy distributions of the sources are dominated by dust emission in the range 5-60 microns. Silicate grains are seen in their dust shells. Emission lines of increasing excitation are seen in Hen1379, Hen1191, and Hen1044. H-alpha profiles of Hen1191 and Hen1379 are used to estimate their radial velocities and the expansion velocities of their circumstellar shells. The objects are interpreted to be in stages intermediate between the asymptotic giant branch and the PN stage.

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