Title: A search for diffuse bands in the circumstellar envelopes of post-AGB stars
Authors: Luna, R ×
Cox, Nicky
Satorre, M. A
Hernandez, D. A. Garcia
Suarez, O
Lario, P. Garcia #
Issue Date: Mar-2008
Publisher: Springer-Verlag
Series Title: Astronomy & Astrophysics vol:480 issue:1 pages:133-U37
Abstract: In this work we present the results of a systematic search for diffuse bands (DBs, hereafter) in the circumstellar envelopes of a carefully selected sample of post-AGB stars. We concentrated on analyzing 9 of the DBs most commonly found in the interstellar medium. The strength of these features is determined using high-resolution optical spectroscopy, and the results obtained are compared with literature data on field stars affected only by interstellar reddening. Based on the weak features observed in the subsample of post-AGB stars dominated by circumstellar reddening, we conclude that the carrier(s)of these DBs must not be present in the circumstellar environment of these sources, or at least not under the excitation conditions in which DBs are formed. This conclusion is applicable to all the post-AGB stars studied, irrespective of the dominant chemistry or the spectral type of the star considered. A detailed radial velocity analysis of the features observed in individual sources confirms this result, as the Doppler shifts measured are found to be consistent with an interstellar origin.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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