Soszyński, I. and Smolec, R. and Udalski, A. and Szymanski, M. K. and Pietrukowicz, P. and Skowron, D. M. and Skowron, J. and Mróz, P. and Poleski, R. and Kozłowski, S. and Iwanek, P. and Wrona, M. and Gromadzki, M. and Ulaczyk, K. and Rybicki, K. (2020) OGLE-GAL-ACEP-091: The First Known Multi-mode Anomalous Cepheid. Astrophysical Journal Letters, 901 (2). Art. No. L25. ISSN 2041-8213. https://resolver.caltech.edu/CaltechAUTHORS:20200925-091914617
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Abstract
Anomalous Cepheids (ACs) are metal-deficient, core-helium-burning pulsating stars with masses in the range 1.2–2.2 M_⊙. 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_⊙ star with a metallicity of about [Fe/H] = −0.5 dex.
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| Additional Information: | © 2020. The American Astronomical Society. Received 2020 August 19; revised 2020 September 7; accepted 2020 September 13; published 2020 September 25. We thank Dr. Giuseppe Bono, the referee of this Letter, for his valuable comments on this work. This work has been supported by the National Science Centre, Poland, grant MAESTRO No. 2016/22/A/ST9/00009. The OGLE project has received funding from the Polish National Science Centre grant MAESTRO No. 2014/14/A/ST9/00121. R.S. was supported by the National Science Center, Poland, Sonata BIS project 2018/30/E/ST9/00598. This work is based in part on observations made with the Spitzer Space Telescope, which was operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. | ||||||||||||||||||||||||||||||||
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| Subject Keywords: | Anomalous Cepheid variable stars ; Multi-periodic pulsation ; Pulsating variable stars | ||||||||||||||||||||||||||||||||
| Issue or Number: | 2 | ||||||||||||||||||||||||||||||||
| Classification Code: | Unified Astronomy Thesaurus concepts: Anomalous Cepheid variable stars (2106); Multi-periodic pulsation (1078); Pulsating variable stars (1307) | ||||||||||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20200925-091914617 | ||||||||||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20200925-091914617 | ||||||||||||||||||||||||||||||||
| Official Citation: | I. Soszyński et al 2020 ApJL 901 L25 | ||||||||||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||||||||
| ID Code: | 105541 | ||||||||||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||||||||
| Deposited By: | George Porter | ||||||||||||||||||||||||||||||||
| Deposited On: | 25 Sep 2020 17:40 | ||||||||||||||||||||||||||||||||
| Last Modified: | 25 Sep 2020 17:40 |
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