JOURNAL ARTICLE

Variability of physical parameters of IRAS 22272+5435 during the pulsation cycle.

  • Published In: Journal of Astrophysics & Astronomy, 2025, v. 46, n. 1. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Začs, Laimons; Puķītis, Kārlis 3 of 3

Abstract

A time series of high-resolution spectra in the optical wavelength region was used to examine the variability of physical parameters of the early-stage post-AGB star IRAS 22272 + 5435. Excitation balance analysis for a sample of iron (Fe), cerium (Ce), and neodymium (Nd) lines confirms effective temperature changes from about 5100 ± 150 to 5750 ± 100 K during the 132-day pulsation cycle. Using the method of ionization balance, we observed a minor change in surface gravity between log g = 0.5 and 0.7 ± 0.3 (cgs). The microturbulent velocity does not change within the uncertainty limits, ξ t = 4.5 ± 0.5 km s - 1 . Large macroturbulence in the range of 20–25 km s - 1 was found. We observed variable intensity of the oxygen (O) infrared triplet at 7771-5 Å which is most likely due to changes in luminosity during the pulsation cycle. [ABSTRACT FROM AUTHOR]

Additional Information

  • Source:Journal of Astrophysics & Astronomy. 2025/01, Vol. 46, Issue 1, p1
  • Document Type:Article
  • Subject Area:Astronomy and Astrophysics
  • Publication Date:2025
  • ISSN:0250-6335
  • DOI:10.1007/s12036-024-10037-5
  • Accession Number:183109775
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