English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the results of photometry of the intermediate polar V647 Aur.Observations were obtained over 42 nights in 2012 and 2013. The total durationof the observations was 246 h. We clearly detected three oscillations withperiods of 932.9123+\-0.0011, 1008.30797+\-0.00038 and 1096.955+\-0.004 s,which may be the white dwarf spin period and two orbital sidebands,accordingly. The oscillation with a period of 932.9123 s has a quasi-sinusoidalpulse profile with a slightly changeable semi-amplitude from 10.9 mmag in 2012to 12.5 mmag in 2013. The oscillation with a period of 1008.30797 s has aslightly asymmetric pulse profile with a remarkable small hump on the ascendingpart. The semi-amplitude of this oscillation is highly changeable both in atime-scale of days (26-77 mmag) and in a time-scale of years (47 mmag in 2012and 34 mmag in 2013). The oscillation with a period of 1096.955 s has a highlyasymmetric pulse profile with a semi-amplitude of about 6 mmag. The threedetected oscillations imply an orbital period of 3.46565+\-0.00006 h. Bycomparing our data with the data of B. T. Gansicke et al., which were obtained8 years ago, we discovered that the spin period of the white dwarf in V647 Aurdecreases with dP/dt=(-1.36+\-0.08) X 10^-10. This important result should beconfirmed by future observations. Our oscillation ephemeredes and times ofmaxima can be useful for this confirmation.

An extensive photometric study of the recently discovered intermediate polar V647 Aur (1RXS J063631.9+353537)