Two period-radius relations for classical Cepheids: Determining the pulsation mode and the distance scale |
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| Authors: | M E Sachkov |
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| Institution: | (1) Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, Russia |
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| Abstract: | Based on our radial-velocity measurements and on published photometric observations, we calculated the radii of 64 classical Cepheids that were previously assumed to be fundamental-mode pulsators. Our detailed analysis of the period-radius diagram shows that the sample of Cepheids with pulsation periods shorter than 9 days probably contains a significant fraction (up to 30%) of stars pulsating in the first overtone. This fact leads to incorrect luminosity estimates for Cepheids and may be partly responsible for the discrepancy between the short and long distance scales. |
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| Keywords: | variable stars Cepheids pulsation mode distance scale |
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