EDP Sciences
Free access
Issue A&A
Volume 480, Number 1, March II 2008
Page(s) 133 - 148
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20065282



A&A 480, 133-148 (2008)
DOI: 10.1051/0004-6361:20065282

A search for diffuse bands in the circumstellar envelopes of post-AGB stars

R. Luna1, N. L. J. Cox2, M. A. Satorre1, D. A. García Hernández3, O. Suárez4, and P. García Lario2

1  Laboratorio de Astrofísica Experimental, Escuela Politécnica Superior de Alcoy, Universidad Politécnica de Valencia, Plaza de Ferrándiz y Carbonell, 03801 Alcoy, Alicante, Spain
    e-mail: ralunam@fis.upv.es
2  Herschel Science Centre, Research and Scientific Support Department of ESA, European Space Astronomy Centre, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
3  W. J. McDonald Observatory. The University of Texas at Austin. 1 University Station, C1400. Austin, TX 78712-0259, USA
4  LUAN, Université de Nice Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France

(Received 27 March 2006 / Accepted 6 November 2007)

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.


Key words: stars: AGB and post-AGB -- ISM: dust, extinction



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Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

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