Long-term variability of the SX Phoenicis star CY Aquarii

Details Long-term variability of the SX Phoenicis star CY Aquarii Long-term variability of the SX Phoenicis star CY Aquarii

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...405..685f&link_type=abstract

Astronomy and Astrophysics, v.405, p.685-688 (2003)

Astronomy and Astrophysics

Astrophysics

13

Stars: Individual: Cy Aqr, Stars: Sx Phe, Stars: Oscillations

Scientific paper

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 P=0fd061038394 +/- 0fd000000006 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.
Based in part on observations obtained at ESO La Silla, application 269.D-5038.

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