V440 Per: the longest-period overtone Cepheid
| العنوان: | V440 Per: the longest-period overtone Cepheid |
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| المؤلفون: | W. Dimitrov, Przemyslaw Bartczak, T. Kwiatkowski, M. Fagas, R. Ratajczak, Pawel Moskalik, Radosław Smolec, W. Borczyk, Krzysztof Kamiński, Agata Rozek, A. Schwarzenberg-Czerny, R. Baranowski |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 396:2194-2200 |
| بيانات النشر: | Oxford University Press (OUP), 2009. |
| سنة النشر: | 2009 |
| مصطلحات موضوعية: | Physics, education.field_of_study, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cepheid variable, Overtone, Population, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Radial velocity, symbols.namesake, Amplitude, Fourier transform, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Radiative transfer, symbols, Astrophysics::Solar and Stellar Astrophysics, Phase velocity, education, Solar and Stellar Astrophysics (astro-ph.SR), QB, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | V440 Per is a Population I Cepheid with the period of 7.57 day and low amplitude, almost sinusoidal light and radial velocity curves. With no reliable data on the 1st harmonic, its pulsation mode identification remained controversial. We obtained a radial velocity curve of V440 Per with our new high precision and high throughput Poznan Spectroscopic Telescope. Our data reach the accuracy of 130 m/s per individual measurement and yield a secure detection of the 1st harmonic with the amplitude of A_2= 140+/- 15 m/s. The velocity Fourier phase \phi_21 of V440 Per is inconsistent at the 7.25 \sigma level with those of the fundamental mode Cepheids, implying that the star must be an overtone Cepheid, as originally proposed by Kienzle et al.(1999). Thus, V440 Per becomes the longest period Cepheid with the securely established overtone pulsations. We show, that the convective nonlinear pulsation hydrocode can reproduce the Fourier parameters of V440 Per very well. Requirement to match the observed properties of V440 Per constrains free parameters of the dynamical convection model used in the pulsation calculations, in particular the radiative losses parameter. Comment: Submitted to MNRAS |
| وصف الملف: | application/pdf |
| تدمد: | 1365-2966 0035-8711 |
| DOI: | 10.1111/j.1365-2966.2009.14865.x |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9af3c9735fd9a06e4dd74629c6120770 https://doi.org/10.1111/j.1365-2966.2009.14865.x |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....9af3c9735fd9a06e4dd74629c6120770 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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| DOI: | 10.1111/j.1365-2966.2009.14865.x |