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Abdel-Sabour, M.
- Frequency analysis of Short Periodic Cepheid BD+13 218 as Seen from SMEI Observations
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Authors
Affiliations
1 National Research Institute of Astronomy and Geophysics, 11421 Helwan, EG
2 National Research Institute of Astronomy and Geophysics, 11421 Helwan, IN
1 National Research Institute of Astronomy and Geophysics, 11421 Helwan, EG
2 National Research Institute of Astronomy and Geophysics, 11421 Helwan, IN
Source
Journal of Physics & Astronomy, Vol 5, No 3 (2017), Pagination: 1-13Abstract
A total of 1848 flux observations of BD+13 218 are obtained by using the Solar Mass Ejection Imager (SMEI) on board of the Coriolis satellite. The data reveal a significant cycle-to-cycle fluctuation in the pulsation period, indicating that classical Cepheid may not be accurate regardless of the specific points used to determine the O-C values. Eddington & Plakidis (1929) methods and random fluctuations in periods were studied. The present detailed O-C residuals for pulsating star BD+13 218 (P=2.8364 day) is studied. Pulsation frequencies and Fourier spectra are presented. By using the empirical relations for stellar structure we determined the parameters of BD+13 218, Teff = 5917.052±145.262, <R*/R☉> =1.404 ± 0.008 , M/M☉ = 1.528±0.087 and log g∗ = 2.284 ± 0.063.Keywords
Stars, Evolution–Stars, Individual, Bd+13 218–Cepheids.Full Text
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