RW Sex: a steady cataclysmic
Observations: 26, 29 April 2005
3 May 2005
Time-series of this NL cataclysmic are presented.
RW Sex is a cataclysmic variable star, that is a binary star with an
interacting white dwarf. It is classified as a NL (according to the GCVS
it is also a ZZ (pulsating white dwarf) and according to other catalogs
it is a UX). The orbital period may be measured by spectroscopy and is
RW Sex is a CBA
target for April 2005.
The observations were carried out with a 203mm SC telescope, a Clear filter and
a SBIG ST7E camera (KAF401E CCD). Each exposure has a duration of 60 seconds.
117 images were obtained.
RW Sex is much brighter than the stars that may be used for comparison
so the statistical uncertainties come mostly from the comparison star.
I use then 5 comparison stars to reduce this effect. I stacked all the images
of the 26 April session and adjusted their magnitudes so that
they fit the Pogson law. These comparison stars are:
The check star is GSC5490-00487 (which is also used as one of the comparison star).
A sample image with the field of view is here.
The results are:
Red: the light curve of RW Sex. The error bars are +/- the 1-sigma
statistical uncertainties. Green: the light curve of the check star.
Variation of the air mass during the session.
According to Stokes et al (2000) 490.435 is the 0-phase of the orbital period.
Stokes S.J., Evans J.M., Bianchini A., Canterna R. (2000) Bulletin of the AAS
32 1548 Abstract.
Telescope and camera configuration A4C02.
Software and computer configuration.