Pulsating chromosphere of classical Cepheids
نویسندگان
چکیده
منابع مشابه
New period - luminosity and period - color relations of classical Cepheids III . Cepheids in SMC
The photometric data for 460 classical, fundamental-mode Cepheids in the SMC with log P > 0.4 measured by Udalski et al. have been analyzed for their period-color (P-C) and period-luminosity (P-L) relations, and for the variation of amplitude across the instability strip in a similar way that was done in Papers I and II of this series. The SMC Cepheids are bluer in (B−V) 0 at a given period tha...
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We compared period changes derived from O − C diagrams for 63 classical Cepheids from our Galaxy with model calculations. We found that for Cepheids with log P > 1.0 the observed changes are smaller than predicted values, except variable SZ Cas. However some of the first overtone Cepheids, particularly EU Tau and Polaris, change its period much faster than it follows from theory. Summary of the...
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Photometric data for 593 Cepheids in the LMC, measured by Udalski et al. in the OGLE survey, augmented by 92 longer period Cepheids from other sources, are analyzed for the period-color (P-C) and period-luminosity (P-L) relations, and for the variations of amplitude, light curve shape, and period across the instability strip at constant absolute magnitude. Both the P-C and P-L relations have di...
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321 Galactic fundamental-mode Cepheids with good B,V , and (in most cases) I photometry by Berdnikov et al. (2000) and with homogenized color excesses E(B−V) based on Fernie et al. (1995) are used to determine their period-color (P-C) relation in the range 0.4 < log P ∼ < 1.6. The agreement with colors from different model calculations is good to poor. – Distances of 25 Cepheids in open cluster...
متن کاملPhase Lags and Pulsation Modes of Classical Cepheids
The first-order phase lag between light and velocity is calculated from Fourier decompositions of the variations of 12 classical Cepheids. The phase lags have a narrow range, with maximum expansion velocity always retarded with respect to maximum light. The average value of the first-order phase lag is found to be approximately -0.3, close to the theoretical value obtained from the models of Si...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2020
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/202037795