[vsnet-alert 4001] KZ Gem(?) in rare outburst - confirmation and first analysis of CCD run

["Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>]

Dear all,

KZ Gem (or more precise: the object indicated by P. Schmeer) is indeed in outburst, as confirmed by my CCD observations of Jan 09/10, 2000, obtained at CBA Belgium Observatory. I have monitored the object using the 0.35-m f/6.3 telescope and a ST-7 CCD (unfiltered) for about 2.6 hours. The resulting light curve is quite flat, showing no periodic modulations.

2000 Jan 09.967 UT, mag 14.8 C

Best regards,
Tonny Vanmunster
CBA Belgium Observatory

> -----Original Message-----
> From: owner-vsnet-alert@kusastro.kyoto-u.ac.jp
> [mailto:owner-vsnet-alert@kusastro.kyoto-u.ac.jp]On Behalf Of Patrick
> Schmeer
> Sent: zondag 9 januari 2000 19:48
> To: vsnet-alert@kusastro.kyoto-u.ac.jp; Patrick Schmeer
> Subject: [vsnet-alert 3991] KZ Gem(?) in rare outburst
> 
> 
> My alert message:
> 
> KZ Gem appears to be in outburst at mag 14. Can you confirm?
> 
>  
> Rod Stubbings' reply:
> 
> > Cannot confirm outburst.  I've had this field under observation 
> and didn't
> > notice any change tonight.  After your message I went out to look at the
> > field again but could not see an outburst.  I'm using the vsnet 
> chart.  The
> > last few nights I thought there might have been an outburst but 
> to me the
> > close star above KZ Gem seems to have brightened a little.
> 
> 
> My reply: 
> 
> There are three USNO-A2.0 stars very close to the catalogued position of
> KZ Gem:
> A) 06:53:02.496  +16:40:05.96  14.3  15.3
> B) 06:53:02.468  +16:40:00.05  14.9  16.5
> C) 06:53:02.744  +16:39:50.61  17.6  17.9
>  
> The star marked in DWS97 is just north of star C and southeast of B. 
> Star B (or a very close companion of it) is the outbursting object. It
> brightened by 2 magnitudes since Jan. 7.302 UT and was as bright as
> star A (mag 14.3) on an unfiltered CCD image taken on Jan. 9.292 UT. 
> I haven't yet received the original finding chart, but I would consider
> it as highly unlikely that there are two outbursting objects so close
> together (both reaching mag 14). It's much more likely that the wrong
> star is marked in DWS97.
> 
> According to the GCVS KZ Gem is a dwarf nova with a photographic
> magnitude range of 14.7-[18.5 and a mean cycle length of 258 days.
>  
> Astrometry, spectroscopy, and high-speed photometry during the current
> rare outburst are very urgently required.
>  
> Patrick 
>  
> P.S.:
> Please forget about CW Mon and turn your attention to this star (if 
> still bright) - or RX J0640-24. 
>

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