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Morphological classification of post-AGB stars

Published online by Cambridge University Press:  30 August 2012

Arturo Manchado
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, La Laguna, E-38205, Spain Departamento de Astrofísica, Universidad de La Laguna, La Laguna, E-38205, Spain Consejo Superior de Investigaciones Cient Rficas, E-28006 Madrid, Spain
D. Anibal García-Hernández
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, La Laguna, E-38205, Spain Departamento de Astrofísica, Universidad de La Laguna, La Laguna, E-38205, Spain
Eva Villaver
Affiliation:
Departamento de Física Teórica C-XI, Univ. Autónoma de Madrid, E-28049 Madrid, Spain
Jean Guironnet de Massas
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, La Laguna, E-38205, Spain University Joseph Fourier, Grenoble University Joseph Fourier, 3840 Grenoble, France
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Abstract

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We present a complete study of the morphology of post-Asymptotic Giant Branch (post-AGB) stars. The post-AGB stage is a very short evolutionary phase between the end of the AGB and the beginning of the Planetary Nebula (PN) stage (between 100 and 10,000 yrs). Post-AGB stars do not show variability and are not hot enough to fully ionize the hydrogen envelope. We have defined the end of the post-AGB phase and the beginning of the PN phase when the star has a temperature of 30000 K. Post-AGB stars have a circumstellar shell that is illuminated by the central stars or partially ionized. However, this circumstellar shell is too small to be resolved by ground-based observations. Thus, we have used the Hubble Space Telescope (HST) database to resolve these shells. 117 post-AGBs were found in this database. Here we present the preliminary results on their morphological classification and the correlation with the galactic latitude. Our preliminary results show that 38% of the sample are stellar-like (S), 31% bipolar (B), 12% multipolar (M) and 19% elliptical (E).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

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