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Stellar and circumstellar lines in the spectra of protoplanetary nebulae

Published online by Cambridge University Press:  06 October 2025

Aija Grankina ,
Kārlis Puķītis Open the ORCID record for Kārlis Puķītis [Opens in a new window]  and
Laimons Začs
Aija Grankina*
Affiliation:
Laser Center, Faculty of Physics, Mathematics, and Optometry, University of Latvia, Raiņa bulvāris 19, LV-1586, Rīga, Latvia
Kārlis Puķītis
Affiliation:
Laser Center, Faculty of Physics, Mathematics, and Optometry, University of Latvia, Raiņa bulvāris 19, LV-1586, Rīga, Latvia
Laimons Začs
Affiliation:
Laser Center, Faculty of Physics, Mathematics, and Optometry, University of Latvia, Raiņa bulvāris 19, LV-1586, Rīga, Latvia
*
email: aija.laure@gmail.com
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Abstract

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We present an analysis of high resolution spectra in the optical and near infrared wavelength region for cool protoplanetary nebulae with the goal to identify lines of carbon bearing molecules and some less studied neutron capture elements. The site of formation of CN and C2 lines in the spectra of IRAS 22272+5435 and IRAS Z02229+6208 appears to be an extended stellar atmosphere and inner/outer CSE. The abundance of thulium was estimated for the first time in the photosphere of IRAS22272+5435, log ε(Tm) ≃ 1.5.

Keywords

stars: AGB and post-AGBstars: atmospheresstars: circumstellar matterstars: individual (IRAS 22272+5435, IRAS Z02229+6208)line: identification

Information

Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S384: Planetary Nebulae: A Universal Toolbox in the Era of Precision Astrophysics , December 2023 , pp. 420 - 421
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

References

Puķītis, K., Začs, L., & Sperauskas, J. 2023, ApJ, 948, 70. doi: 10.3847/1538-4357/acc52b CrossRefGoogle Scholar
Začs, L. & Puķītis, K. 2023, ApJ, 952, 49. doi: 10.3847/1538-4357/acdcfe CrossRefGoogle Scholar