Abstract
Based on our high-spectral-resolution observations performed with the echelle spectrograph of the 6-m telescope, we have studied the peculiarities of the spectrum and the velocity field in the atmosphere and envelope of the optical counterpart of the infrared source IRAS 23304+6347. We have reached the conclusion about the absence of significant variations in the radial velocity V r inferred from atmospheric absorptions and about its coincidence with the systemic velocity deduced from radio data. The envelope expansion velocity V exp = 15.5 km s−1 has been determined from the positions of rotational lines of the C2 Swan (0; 0) band. A complex emission-absorption profile of the Swan (0; 1) 5635 Å band has been recorded. Our analysis of the multicomponent Na I D doublet line profile has revealed interstellar components with velocities V (IS) = −61.6 and −13.2 km s−1 as well as a circumstellar component with V (CS) = −41.0 km s−1 whose position corresponds to the velocity inferred from C2 features. The presence of the interstellar component with V r = −61.6 km s−1 in the spectrum allows d = 2.5 kpc to be considered as a lower limit for the distance to the star. A splitting of the profiles for strong absorptions of ionized metals (Y II, Ba II, La II, Si II) attributable to the presence of a short-wavelength component originating in the circumstellar envelope has been detected in the optical spectrum of IRAS 23304+6347 for the first time.
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Original Russian Text © V.G. Klochkova, V.E. Panchuk, N.S. Tavolzhanskaya, 2015, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2015, Vol. 41, Nos. 1–2, pp. 17–26.
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Klochkova, V.G., Panchuk, V.E. & Tavolzhanskaya, N.S. Peculiarities of the atmosphere and envelope of a post-AGB star, the optical counterpart of IRAS 23304+6347. Astron. Lett. 41, 14–22 (2015). https://doi.org/10.1134/S1063773715020024
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DOI: https://doi.org/10.1134/S1063773715020024