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OGLE-GAL-ACEP-091: The First Known Multi-mode Anomalous Cepheid

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dc.abstract.enAnomalous Cepheids (ACs) are metal-deficient, core-helium-burning pulsating stars with masses in the range 1.2-2.2 ${M}_{\odot }$ . Until recently, all known ACs were pure single-mode pulsators. The first candidate for an AC pulsating in more than one radial mode—OGLE-GAL-ACEP-091—was recently identified in the Milky Way based on the photometric database of the Optical Gravitational Lensing Experiment (OGLE) survey. We analyze this object showing that it is actually a triple-mode pulsator. Its position in the Petersen diagram, the light-curve morphology quantified by Fourier coefficients, and absolute magnitudes derived from the Gaia parallax are consistent with the assumption that OGLE-GAL-ACEP-091 is an AC. Our grid of linear pulsation models indicates that OGLE-GAL-ACEP-091 is a 1.8 ${M}_{\odot }$ star with a metallicity of about [Fe/H] = -0.5 dex.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorSoszyński, Igor
dc.contributor.authorSmolec, Radosław
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorSzymański, Michał
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSkowron, Dorota
dc.contributor.authorSkowron, Jan
dc.contributor.authorMróz, Przemysław
dc.contributor.authorPoleski, Radosław
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorIwanek, Patryk
dc.contributor.authorWrona, Marcin
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorRybicki, Krzysztof
dc.date.accessioned2024-01-25T15:43:29Z
dc.date.available2024-01-25T15:43:29Z
dc.date.copyright2020-09-14
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeŚrodki finansowe przyznane na realizację projektu w zakresie badań naukowych lub prac rozwojowych
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume901
dc.identifier.doi10.3847/2041-8213/ABB817
dc.identifier.issn2041-8205
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114539
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020ApJ...901L..25S
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal Letters
dc.relation.pagesL25
dc.rightsOther
dc.sciencecloudnosend
dc.titleOGLE-GAL-ACEP-091: The First Known Multi-mode Anomalous Cepheid
dc.typeJournalArticle
dspace.entity.typePublication