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Correlation of Successive Maxima in Mira, c Cygni, R Leonis,

and R Hydrae


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Costantino Sigismondi

Yale University, Department of Astronomy, P.O. Box 208101, New Haven, CT 06520-8101




International Center for Relativistic Astrophysics (ICRA), University of Rome “La Sapienza”, Physics Department, Piazzale Aldo Moro 5 00185, Rome, Italy


Received April 23, 2002


Abstract  An analysis was done of the maxima of Mira Ceti, c Cygni, R Leonis, and R Hydrae, four Mira-type variable stars chosen from among those studied by Argelander in 1839. A negative correlation between the luminosity of consecutive maxima was found, except for R Hya. Mi+1 - Mi vs. Mi yields a correlation index of r2 = 0.6 for Mira and c Cyg, r2 = 0.44 for R Leo, and r2 = 0.25 for R Hya. Data analyzed range from the discovery of Mira (1596) to the present time; they include AAVSO data, and there are from 90 (R Hya) to 179 (Mira Ceti) pairs of consecutive maxima.

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