Astrophysical calibration of the oscillator strengths of <i>YJ</i>-band absorption lines in classical Cepheids

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dc.contributor.authorElgueta, S. S.
dc.contributor.authorMatsunaga, N.
dc.contributor.authorJian, M.
dc.contributor.authorTaniguchi, D.
dc.contributor.authorKobayashi, N.
dc.contributor.authorFukue, K.
dc.contributor.authorHamano, S.
dc.contributor.authorSameshima, H.
dc.contributor.authorKondo, S.
dc.contributor.authorArai, A.
dc.contributor.authorIkeda, Y.
dc.contributor.authorKawakita, H.
dc.contributor.authorOtsubo, S.
dc.contributor.authorYasui, C.
dc.contributor.authorTsujimoto, T.
dc.date.accessioned2025-01-20T16:11:20Z
dc.date.available2025-01-20T16:11:20Z
dc.date.issued2024
dc.description.abstractNewly-developed spectrographs with increased resolving powers, particularly those covering the near-IR range, allow the characterization of more and more absorption lines in stellar spectra. This includes the identification and confirmation of absorption lines and the calibration of oscillator strengths. In this study, we provide empirical values of log gf based on the abundances of classical Cepheids obtained with optical spectra to establish the consistency between optical and infrared abundance results. Using time series spectra of classical Cepheids obtained with WINERED spectrograph (0.97-1.35 mu m, R similar to 28000), we demonstrate that we can determine the stellar parameters of the observed Cepheids, including effective temperature (T-eff), surface gravity (log g), microturbulence (xi), and metallicity ([m/H]). With the newly calibrated relations of line-depth ratios, we can achieve accuracy and precision comparable to optical studies, with uncertainties of similar to 90 K and 0.108 dex for T-eff, and log g, respectively. Finally, we created a new atlas of absorption lines, featuring precise abundance measurements of various elements found in the atmosphere of Cepheids, including neutron-capture elements whose log gf values have been astrophysically calibrated.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stae1674
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stae1674
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90265
dc.identifier.wosidWOS:001281876300008
dc.issue.numero4
dc.language.isoen
dc.pagina.final3712
dc.pagina.inicio3694
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjecttechniques: spectroscopic
dc.subjectstars: abundances
dc.subjectstars: fundamental parameters
dc.subjectstars: variables: Cepheids
dc.subjectinfrared: stars
dc.titleAstrophysical calibration of the oscillator strengths of <i>YJ</i>-band absorption lines in classical Cepheids
dc.typeartículo
dc.volumen532
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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