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Optical spectrum of the bipolar nebula AFGL 2688

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Abstract

Based on echelle spectra obtained at the prime focus of the 6-m telescope, we have determined for the first time the detailed chemical composition of one of the components of the bipolar nebula identified with the intense infrared source AFGL 2688 by the model-atmosphere method. The iron abundance [Fe/H]=−0.59 dex derived for AFGL 2688 suggests that the object probably belongs to an intermediate population of the Galaxy. The stellar atmosphere exhibits high carbon and nitrogen abundances, [C/Fe]=+0.73 and [N/Fe]=+2.00, and C/O>1, confirming that the object is at the post-AGB stage. However, the detected overabundance of s-process elements (yttrium and barium) relative to iron is modest: [X/Fe]=+0.55. The lanthanides are even less enhanced: for La, Ce, Pr, and Nd, the mean abundance relative to iron is [la/Fe]=+0.26. This behavior of the heavy metals is consistent with the low intensity of the 21-μm band in the infrared spectrum of AFGL 2688; the intensity of this emission band is great in the spectra of all the studied PPN with large overabundances of s-process elements. An analysis of the radial velocities measured from spectral features originating in the atmosphere and in the circumstellar shell has revealed a high-velocity (∼60 km s−1) component of the stellar wind from AFGL 2688.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachaevo-Cherkessiya, 369167, Russia

    V. G. Klochkova & V. E. Panchuk

  2. N. Copernicus Astronomical Center, Torun, Poland

    R. Szczerba

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  1. V. G. Klochkova
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  2. R. Szczerba
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  3. V. E. Panchuk
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__________

Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 26, No. 7, 2000, pp. 510–524.

Original Russian Text Copyright © 2000 by Klochkova, Szczerba, Panchuk.

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Klochkova, V.G., Szczerba, R. & Panchuk, V.E. Optical spectrum of the bipolar nebula AFGL 2688. Astron. Lett. 26, 439–451 (2000). https://doi.org/10.1134/1.20412

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