Search for random fluctuations in periods of Cepheids

Leonid N. Berdnikov; Ian R. Stevens

doi:10.1117/12.855577

2 April 2010 Search for random fluctuations in periods of Cepheids

Leonid N. Berdnikov, Ian R. Stevens

Proceedings Volume 7651, International Conference on Space Information Technology 2009; 76510W (2010) https://doi.org/10.1117/12.855577
Event: International Conference on Space Information Technology 2009, 2009, Beijing, China

Abstract

A total of 94269 unfiltered CCD observations for 16 of the brightest galactic Cepheids, obtained by the SMEI instrument, were reduced with the Hertzsprung method to define individual times of light maxima. Then O-C residuals for all of 16 Cepheids were analyzed with the Eddington-Plakidis method and random fluctuations in periods for four of them, SU Cas (P=1^d.95), δ Cep (P=5^d.37), κ Pav (P=9^d.09), and α UMi (P=3^d.97) were detected. Such fluctuations for short period Cepheids are found for the first time. O-C diagrams as well as results of the Eddington-Plakidis test are presented.

Citation Download Citation

Leonid N. Berdnikov and Ian R. Stevens "Search for random fluctuations in periods of Cepheids", Proc. SPIE 7651, International Conference on Space Information Technology 2009, 76510W (2 April 2010); https://doi.org/10.1117/12.855577

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