Journal Article

High-resolution optical spectroscopy of the F supergiant protoplanetary nebula IRAS 18095+2704

T. Şahin, David L. Lambert, V. G. Klochkova and N. S. Tavolganskaya

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 1, pages 612-626
Published in print January 2011 | ISSN: 0035-8711
Published online December 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17467.x
High-resolution optical spectroscopy of the F supergiant protoplanetary nebula IRAS 18095+2704

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An abundance analysis is presented for IRAS 18095+2704 (V887 Her), a post-asymptotic giant branch star and protoplanetary nebula. The analysis is based on high-resolution optical spectra from the McDonald Observatory and the Special Astrophysical Observatory. Standard analysis using a classical Kurucz model atmosphere and the line analysis program moog provides the atmospheric parameters: Teff= 6500 K, log g=+0.5, microturbulent velocity ξ= 4.7 km s−1 and [Fe/H]=−0.9. Extraction of these parameters is based on excitation of Fe i lines, ionization equilibrium between neutral and ions of Mg, Ca, Ti, Cr and Fe, and the wings of hydrogen Paschen lines. Elemental abundances are obtained for 22 elements and upper limits for an additional four elements. These results show that the star's atmosphere has not experienced a significant number of C- and s-process enriching thermal pulses. Abundance anomalies as judged relative to the compositions of unevolved and less-evolved normal stars of a similar metallicity include Al, Y and Zr deficiencies with respect to Fe of about 0.5 dex. Judged by composition, the star resembles an RV Tauri variable that has been mildly affected by dust–gas separation reducing the abundances of the elements of highest condensation temperature. This separation may occur in the stellar wind. There are indications that the standard one-dimensional local thermodynamic equilibrium analysis is not entirely appropriate for IRAS 18095+2704. These include a supersonic macroturbulent velocity of 23 km s−1, emission in Hα and the failure of predicted profiles to fit observed profiles of Hβ and Hγ.

Keywords: stars: abundances; stars: AGB and post-AGB; stars: late-type

Journal Article.  8549 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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