Search for p-mode oscillations in RX J2117.1+3412

H.-K. Chang, I.-C. Shih, C.-Y. Liu, T. Fan, Y.-S. Wu, F. Roques, A. Doressoundiram, A. Fernandez, B. Christophe, F. Dauny
2013 Astronomy and Astrophysics  
We report the effort to search for white dwarf p-mode oscillations in RX J2117.1+3412 (V2027 Cyg), a GW Vir star. The data were taken with Miosotys, a multi-fiber photometer, mounted on the 1.93-m telescope at Observatoire de Haute-Provence (OHP) with a 20-Hz cadence in May 2010 and June 2012. Two intriguing signatures at 1.2081 Hz and 2.5852 Hz were found at 3.8-σ and 3.5-σ significance levels, respectively. However, possible atmospheric effects cannot be ruled out. If these two features are
more » ... two features are not real, the 3-σ upper limit of the relative amplitude for the possible oscillations in the frequency range from 1 to 10 Hz is estimated to be about 6 × 10 −4 . This is the first report in the literature for a p-mode oscillation search of GW Vir stars.
doi:10.1051/0004-6361/201322109 fatcat:tipokakvfbh7tatl73as32jjwi