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[vsnet-campaign 1014] Re: WZ Sge: rapidly brightening!
Dear Colleagues,
at Bellatrix Observatory I've just started a run for this
star. It seems to me even brighter!
SGEWZ 20010723.8936 8.4Rc MAS
this is based on R magnitudes from USNO A2.0 for the star in
the field.
Astrometry follows (J2000.0):
RA: 20 07 36.53 Decl: +17 42 15.3
10 reference stars from USNO A2.0; mean residuals: 0.25"
Regards,
Gianluca
Scrive Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>:
>
> WZ Sge: rapidly brightening!
>
> Our preliminary photometry of WZ Sge shows a rapidly
brightening
> of the object. We started time-series observation at
14:30 (UT) and
> the object was about 9.5mag at that time, and then, now
(17:00 UT) we
> estimate the object is about 9.1mag, which indicates the
rising rate
> is about 3.8 mag/day.
>
> As in the recent case of RZ Leo and AL Com, WZ Sge
stars show
> "early superhump" during the very early phase of their
outbursts.
> Tonight observations are important to study the birth of
early
> superhumps.
> As well as follow-up photometric observations, tonight
spectroscopy is
>
> strongly urged.
>
> As reported by Dr. Kuulkers, the object may show
short-period
> oscillations during the rising phase, so observers should
take CCD
> images with an exposure time as short as possible.
> The Kyoto team is now observing with an exposure time of
10s
> (25-cm SC + ST-7E).
>
> Regards,
> Makoto Uemura
>
>
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