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High-resolution spectroscopy of the variable hot post-AGB star LS 4331 (IRAS 17381‑1616)

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dc.contributor.author Ikonnikova, N. P
dc.contributor.author Parthasarathy, M
dc.contributor.author Shaposhnikov, Ivan A
dc.contributor.author Hubrig, S
dc.contributor.author Sarkar, Geetanjali
dc.date.accessioned 2024-12-17T06:06:40Z
dc.date.available 2024-12-17T06:06:40Z
dc.date.issued 2024-12
dc.identifier.citation Journal of Astrophysics and Astronomy, Vol. 45, No. 2, 27 en_US
dc.identifier.issn 0973-7758
dc.identifier.uri http://hdl.handle.net/2248/8612
dc.description Restricted Access en_US
dc.description The original publication is available at springerlink.com
dc.description.abstract An analysis of the high-resolution (R∼48000) optical spectrum of hot (B1Ibe) post-AGB star LS 4331 (IRAS 17381‑1616) is presented. The detailed identification of the observed absorption and emission features in the wavelength range 3700–9200 Å is carried out for the first time. The atmospheric parameters and chemical composition of the star are derived from the non-LTE analysis of absorption lines. We estimated Teff=20900±500 K, logg=2.57±0.08, Vr=-51.7±0.8 km s-1, ξt=24±4 km s-1 and vsini=30±5 km s-1. An abundance analysis for C, N, O, Mg, Al, S, and Si reveals that the N and O abundance is close to solar while metal underabundances relative to the solar value (i.e., [Mg/H]=-1.04 dex, [Al/H]=-1.20 dex, [Si/H]=-0.46 dex) are found. LS 4331 is a high galactic latitude metal-poor and carbon-deficient hot post-AGB star. The underabundance of carbon ([C/H]=-0.64 dex) is similar to that found in other hot post-AGB stars and indicates that the star's AGB phase of evolution was terminated before the third dredge-up. Plasma diagnostics are derived from the nebular emission lines. The presence of nebular emission lines in the spectrum of LS 4331 indicates that the photoionization of the circumstellar envelope has already started. The nebular parameters and expansion velocity of the nebula are derived. Using the Gaia DR3 distance, the absolute luminosity of the star is derived, and the star's position on the post-AGB evolutionary tracks suggests that its initial main sequence mass is about 1.2 M⊙. It is also reported that fast irregular brightness variations with an amplitude of up to 0.3 mag in the V band have been found in the star, typical of hot post-AGB objects. en_US
dc.language.iso en en_US
dc.publisher Springer Nature en_US
dc.relation.uri https://doi.org/10.1007/s12036-024-10012-0
dc.rights © Indian Academy of Sciences
dc.subject Post-AGB stars en_US
dc.subject Atmospheres en_US
dc.subject Abundance en_US
dc.subject Early-type en_US
dc.subject Evolution en_US
dc.subject IRAS 17381‑1616 en_US
dc.title High-resolution spectroscopy of the variable hot post-AGB star LS 4331 (IRAS 17381‑1616) en_US
dc.type Article en_US


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