Astronomy and Astrophysics, volume 456, 599-609 (2006/9-3)
Photometric study of selected cataclysmic variables.
PAPADAKI C., BOFFIN H.M.J., STERKEN C., STANISHEV V., CUYPERS J., BOUMIS P., AKRAS S. and ALIKAKOS J.
Abstract (from CDS):
We present time-resolved photometry of five relatively poorly-studied cataclysmic variables: V1193 Ori
, LQ Peg
, LD 317
, V795 Her
, and MCT 2347-3144
. The observations were made using four 1m-class telescopes for a total of more than 250h of observation and almost 16000 data points. For LQ Peg
WHT spectroscopic data have been analysed as well. The light curves show a wide range of variability on different time scales from minutes to months. We detect for the first time a brightness variation of 0.05mag in amplitude in V1193 Ori
on the same timescale as the orbital period, which we interpret as the result of the irradiation of the secondary. A 20-min quasi-periodic oscillation is also detected. The mean brightness of the system has changed by 0.5mag on a three-month interval, while the flickering was halved. In LQ Peg
a 0.05mag modulation was revealed with a period of about 3h. The flickering was much smaller, of the order of 0.025mag. A possible quasi-periodic oscillation could exist near 30min. For this object, the WHT spectra are single-peaked and do not show any radial-velocity variations. The data of LD 317
show a decrease in the mean magnitude of the system. No periodic signal was detected but this is certainly attributable to the very large flickering observed: between 0.07 and 0.1mag. For V795 Her
, the 2.8-h modulation, thought to be a superhump arising from the precession of the disc, is present. We show that this modulation is not stable in terms of periodicity, amplitude, and phase. Finally, for MCT 2347-3144
, a clear modulation is seen in a first dataset obtained in October 2002. This modulation is absent in August 2003, when the system was brighter and showed much more flickering.
accretion, accretion disks - stars: novae, cataclysmic variables
VizieR on-line data:
<Available at CDS (J/A+A/456/599): tablea1.dat table1.dat figa2.dat figa3.dat figa4.dat figa5.dat figa6.dat>
Text, Figs A1: [PBS2006] V1193 Ori SN (Nos S1-S7), [PBS2006] LQ Peg SNN (Nos S1-S10), [PBS2006] LD 317 SNN (Nos S1-S10), [PBS2006] V795 Her SN (Nos S1-S4), [PBS2006] MCT 2347-3144 SN (Nos S1-S2).
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