Volume 405, Number 2, July II 2003
|Page(s)||685 - 688|
|Section||Stellar structure and evolution|
|Published online||19 June 2003|
Long-term variability of the SX Phoenicis star CY Aquarii*
Astronomy Group, Vrije Universiteit Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium e-mail: email@example.com
Corresponding author: J. N. Fu, firstname.lastname@example.org
Accepted: 18 April 2003
We present 23 new times of maximum light of the SX Phoenicis star CY Aquarii. The O–C diagram reveals a new value of the period since 1996. CY Aqr is the first SX Phe star where the major component of the long-term period change can be represented without invoking large-amplitude period jumps. A linear period change combined with the light-time effect in a highly-eccentric orbit yields a reasonably precise solution. The binary explanation, however, does not account for the full magnitude of the period changes, and small residuals in the time interval 1930–1950 seem to remain.
Key words: stars: individual: CY Aqr / stars: SX Phe / stars: oscillations
© ESO, 2003
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