The possible effects of an unusual resonance in very long period\n Cepheids

1998/03/26 by E. Antonello, Antonello, E.
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Scientific Research and Discoveries #Stellar, planetary, and galactic studies

paper · pdf · doi:10.48550/arxiv.astro-ph/9803302

openalex publication_date 1998/03/26 · openalex created_date 2019/07/30 · openalex updated_date 2026/07/28

Abstract

The shape of the radial velocity and light curves of 24 long-period (30 < P <\n134 days) Cepheids in the Magellanic Clouds shows a progression with the\nperiod. The sequences of the radial velocity and light curves are based only on\na small sample of stars; however, evident changes of the shape can be seen in\nCepheids with period between 90 and 134 d. The Fourier parameter-period\ndiagrams for the radial velocity curves show trends which remind in part those\nof Cepheids with period near 10 d. The plausible interpretation is a resonance,\nprobably P₀/P₁=2 between the fundamental and the first overtone mode. The\npossible importance of this phenomenon for the study of stellar structure and\nevolution in relatively far galaxies is emphasized.\n

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