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| Paper: |
On a Long-term Variability of the Asynchronous Polar BY Cam |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
355 |
| Authors: |
Andreev, M.; Pavlenko, E.; Babina, Yu.; Malanushenko, V. |
| Abstract: |
A long-term monitoring of the asynchronous polar BY Cam has been
carried out by several groups of observers in a total over the years 1988–2012. Apart from the 3.3-hr periodicity related to the
orbital variation and ∼15 d periodicity caused by the the
spin-orbital asynchronizm, BY Cam displays the brightness
variation on the much longer time scale of hundreds and thousands
of days. Basing on our 8-year interval of photometric
observations from 2004 to 2012, we examined the existence of
100–150 d precession of the white dwarf spin axes suggested by
Piirola et al. (1994) and ∼5 year quasi-period found by
Honeycutt and Kafka (2005) in brightness variations. We did not
find any convincing evidence of the ∼145 d period observed
by Honeycutt and Kafka (2005). Instead we found the existence of
∼ the 4.1-year variations in the years 2004–2012 and present
their sine-like profile. The possible connection of these
variations with ∼5 year quasi-period as well as its
interpretation is considered. |
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