J/A+A/456/599 Light curves of 5 cataclysmic variables (Papadaki+, 2006)
Photometric study of selected cataclysmic variables.
Papadaki C., Boffin H.M.J., Sterken C., Stanishev V., Cuypers J.,
Boumis P., Akras S., Alikakos J.
<Astron. Astrophys. 456, 599 (2006)>
=2006A&A...456..599P 2006A&A...456..599P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry
Keywords: accretion, accretion discs - stars: novae, cataclysmic variables
Abstract:
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 16,000 data points. For
LQ Peg WHT spectroscopic data have been analysed as well.
The light curves show a whole 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, that 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-hour modulation, thought to be a
superhump arising from the precession of the disc, is present. We show
this modulation not to be 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.
Description:
tablea1.dat describes the observing log. We have performed photometric
observations of five relatively poorly-studied cataclysmic variables:
V1193 Ori, LQ Peg, LD 317, V795 Her and MCT 2347-3144. For each
target, we give the UT dates it was observed, the site where the
observations took place, the Heliocentric Julian Date at the beginning
of each observing night, the total duration of each run and which
filter, if any, was used.
table1.dat shows (for V1193 Ori, LD 317 and MCT 2347-3144) the mean
nightly magnitude of each CV along with the variation of the
difference between two comparison stars.
figA2.dat-figA6.dat give the light curves of V1193 Ori, LQ Peg,
LD 317, V795 Her and MCT 2347-3144, respectively. In figA3.dat,
figA4.dat and figA5.dat the magnitude is in arbitrary units.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
05 16 26.7 -00 12 14 V1193 Ori = V* V1193 Ori
21 36 19.1 +11 40 55 LQ Peg = V* LQ Peg
23 44 57.5 +43 31 23 LD 317 = FBS 2342+432
17 12 56.1 +33 31 21 V795 Her = V* V795 Her
23 50 30.8 -31 27 29 MCT 2347-3144 = MCT 2347-3144
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 47 70 Log of observations
table1.dat 32 30 Long-term behaviour of three CVs
figa2.dat 19 3750 V1193 Ori light curve
figa3.dat 19 2014 LQ Peg light curve
figa4.dat 19 2984 LD 317 light curve
figa5.dat 19 4496 V795 Her light curve
figa6.dat 19 1435 MCT 2347-3144 light curve
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Name Cataclysmic variable name
15- 24 A10 --- UT UT date at beginning of the night
26- 29 A4 --- Site Observing site (1)
31- 41 F11.3 d HJDstart Heliocentric Julian Date at start
43- 45 F3.1 h Dur Duration of observing run
47 A1 --- Band [RV-] Band used (2)
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Note (1): Observing site as follows:
SAAO = South African Astronomical Observatory
OHL = Observatorium Hoher List, Germany
KR = Kryoneri Observatory, Greece
SK = Skinakas Observatory, Greece
Note (2): Bands as follows:
R = Johnson R filter
V = Johnson V filter
- = unfiltered runs
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Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- UT UT date
9 A1 --- Star [a-c] Flag for the star observed (1)
11- 15 F5.2 mag Mean nightly magnitude of our object
17- 20 F4.2 mag e_ Error in mean(CV)
22- 26 F5.3 mag Nightly mean of the shift between 2comp. stars
28- 32 F5.3 mag e_ Error in mean(shift)
--------------------------------------------------------------------------------
Note (1): Flag for the star observed as follows:
a = observing runs of V1193 Ori,
b = observing runs of LD 317
c = observing runs of MCT 2347-3144
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Byte-by-byte Description of file: figa?.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.8 d Time Number of days after the beginning of
observation (1)
14- 19 F6.3 mag mag ? Magnitude (2)
--------------------------------------------------------------------------------
Note (1): Days from HJD=2452570 for V1193 Ori
Days from HJD=2453158 for LQ Peg
Days from HJD=2452894 for LD 317
Days from HJD=2452794 for V795 Her
Days from HJD=2452572 for MCT 2347-3144
Note (2): The magnitude is in mag units for V1193 Ori (figa2) and
MCT 2347-3144 (figa6).
The magnitude is in arbitrary units for LQ Peg (figa3),
LD 317 (figa4) and V795 Her (figa5).
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Acknowledgements: Christina Papadaki, christip(at)ksb-orb.oma.be
(End) C. Papadaki [Royal Obs. of Belgium, VUB], P. Vannier [CDS] 31-Mar-2006