| Issue |
A&A
Volume 396, Number 2, December III 2002
|
|
|---|---|---|
| Page(s) | 539 - 550 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20021301 | |
| Published online | 03 December 2002 | |
Long-term photometric behaviour of XZ Dra
Binarity or magnetic cycle of a Blazhko-type RRab star
Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, 1525 Budapest, Hungary e-mail: jurcsik,benko,szeidl@konkoly.hu
Corresponding author: J. Jurcsik, jurcsik@konkoly.hu
Received:
31
May
2002
Accepted:
16
July
2002
The extended photometry available for XZ Dra, a Blazhko-type
RR Lyrae star, makes it possible to study its long-term behavior.
It is shown that its pulsation period exhibits cyclic, but not
strictly regular variations with ≈7200 d period.
The Blazhko period (≈76 d) seems to follow the observed
period changes of the fundamental mode pulsation with
gradient.
A binary model cannot explain this order of period change of the
Blazhko modulation, nevertheless it can be brought into agreement
with the O–C data of the pulsation.
The possibility of occurrence of a magnetic cycle is raised.
Key words: stars: individual: XZ Dra / stars: variables: RR Lyr / stars: oscillations / stars: horizontal-branch / techniques: photometric / techniques: radial velocities
© ESO, 2002
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