CX Lyrae 2008 Observing Campaign

Volume 37 number 2 (2009)

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Pierre de Ponthiäre

Jean-Franáois Le Borgne

F. -J. Hambsch

GEOS (Groupe Européen d'Observations Stellaires), 23 Parc de Levesville,

Abstract

The Blazhko effect in CX Lyr has been reported for the first time by Le Borgne et al. (2007). The authors have pointed out that the Blazhko period was not evaluated accurately due to dataset scarcity. The possible period values announced were 128 or 227 days. A newly conducted four-month observing campaign in 2008 (fifty-nine observation nights) has provided fourteen times of maximum. From a period analysis of measured times of maximum, a Blazhko period of 62 ± 2 days can be suggested. However, the present dataset is still not densely sampled enough to exclude that the measured period is still a modulation of the real Blazhko period. Indeed the shape of the (O-C) curve does not repeat itself exactly during the campaign duration.