| Issue |
A&A
Volume 405, Number 2, July II 2003
|
|
|---|---|---|
| Page(s) | 685 - 688 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20030589 | |
| 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: csterken@vub.ac.be
Corresponding author: J. N. Fu, jianfu@vub.ac.be
Received:
4
April
2003
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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