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Frequency analysis of Short Periodic Cepheid BD+13 218 as Seen from SMEI Observations


Affiliations
1 National Research Institute of Astronomy and Geophysics, 11421 Helwan, Egypt
2 National Research Institute of Astronomy and Geophysics, 11421 Helwan, India
 

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.
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  • Frequency analysis of Short Periodic Cepheid BD+13 218 as Seen from SMEI Observations

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Authors

M. Abdel-Sabour
National Research Institute of Astronomy and Geophysics, 11421 Helwan, Egypt
M. R. Sanad
National Research Institute of Astronomy and Geophysics, 11421 Helwan, Egypt
R. Benday
National Research Institute of Astronomy and Geophysics, 11421 Helwan, India
E. Elkholy
National Research Institute of Astronomy and Geophysics, 11421 Helwan, Egypt

Abstract


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.

References