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arXiv 2009.06642astro-ph.SR
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OGLE-GAL-ACEP-091 --第一个已知的多模反常造父变星

OGLE-GAL-ACEP-091 -- The First Known Multi-Mode Anomalous Cepheid

I. Soszyński, R. Smolec, A. Udalski, M. K. Szymański, P. Pietrukowicz, D. M. Skowron, J. Skowron, P. Mróz, R. Poleski, S. Kozłowski, P. Iwanek, M. Wrona, M. Gro… 展开作者

I. Soszyński, R. Smolec, A. Udalski, M. K. Szymański, P. Pietrukowicz, D. M. Skowron, J. Skowron, P. Mróz, R. Poleski, S. Kozłowski, P. Iwanek, M. Wrona, M. Gromadzki, K. Ulaczyk, K. Rybicki

摘要:

反常造父变星(Anomalous Cepheids,AC)是一种缺乏金属、核心燃烧氦的脉动星,质量在1.2-2.2 M_S之间。直到最近,所有已知的AC都是纯粹的单模振荡器。第一个候选人的交流脉动在一个以上的径向模式- OGLE-GAL-ACEP-091 -最近确定在银河系的光度数据库的光学引力透镜实验(OGLE)调查的基础上。我们分析这个对象表明,它实际上是一个三模振荡器。它在彼得森图中的位置,由傅立叶系数量化的光变曲线形态,以及从盖亚视差导出的绝对星等与OGLE-GAL-ACEP-091是AC的假设一致。我们的线性脉动网格模型表明OGLE-GAL-ACEP-091是一颗1.8 M_S的恒星,金属丰度约为[Fe/H] = -0.5 dex。

英文摘要:

Anomalous Cepheids (ACs) are metal-deficient, core-helium-burning pulsating stars with masses in the range 1.2-2.2 M_S. 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_S star with a metallicity of about [Fe/H] = -0.5 dex.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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