[vsnet-alert 6101] Re: [vsnet-campaign 1010] WZ Sge: rapidly brightening!

[gian.masi@flashnet.it]

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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