IQ Eri: a cataclysmic in outburst
Observed: 27, 28 Dec 2008
28 Dec 2008
Updated 29, 31 Dec 2008
Time series for this cataclysmic variable in outburst are presented.
IQ Eri (=1RXS J025538.2-224655) was detected in outburst by Monard (2008).
This is the first outburst since the discovery of
this cataclysmic system in 2002.
The observations were carried out with a 203mm f/6.3 SC telescope, a
Clear filter and a SBIG ST7E camera (KAF401E CCD). 361 images were obtained,
each with an exposure duration of 60s.
For the differential photometry, the comparison star is GSC 6437-00137
with an assumed unfiltered magnitude of 11.8. The check star is GSC 6437-00013
with a measured average magnitude of 13.063, an average 1-sigma statistical
uncertainty of 0.027 and a standard deviation of 0.040.
The resulting light curves:
Session 27 Dec 2008
Red: IQ Eri, blue: the check star shifted by +0.3mag. The error bars
are +/- the 1-sigma statistical uncertainties. The average 1-sigma statistical uncertainty
of the check star is 0.027, the standard deviation 0.037.
It looks like there is a pulsation with a period around 18mn, but this
is not confirmed the night that follows.
IQ Eri is low over my horizon (it is at DEC=-22° and I am at 45°N).
However the sky was fairly good:
The photometry zero point as a function of the airmass.
The blue dot line is a linear fit, the green line is 0.1mag below.
There are a few measurements that are not too good (below the green line)
but I did not filter out any data.
Red: the air mass, blue: the photometry zero point
shifted by -20 mag.
Session 28 Dec 2008
The average 1-sigma statistical uncertainty of the K is 0.027, the
SD is 0.042.
3 images were discarded because of the extra losses (much below the
Monard L.A.G. (2008) IAU CBET 1633.
Telescope and camera configuration.
Computer and software configuration.