[vsnet-alert 4659] RE: 1E 1719.1-1946 at supermaximum?

["Tonny Vanmunster" <tonny.vanmunster@pi.be>]

Patrick,

I just finished analysing a CCD run on 1E 1719.1-1946, which I obtained at CBA Belgium Observatory on Apr 19/20, 2000, using my 0.35-m f/6.3 telescope (unfiltered). The light curve supports your suggestion that the present outburst indeed is a supermaximum, as the curve shows part of (likely) a superhump - amplitude at least 0.3 mag. Unfortunately, the time basis of the observation was too short (object too low in Belgian morning sky) to derive any period. 

It makes no sense for me to continue monitoring this object, given the low altitude, unless there's support from other observatories, willing to take over after I have to shutdown the observatory at dawn.

Magnitude estimate : 20000420.1242 UT, 14.4

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: donderdag 20 april 2000 12:37
> To: vsnet-alert@kusastro.kyoto-u.ac.jp; cba-news@astro.bio2.edu; Patrick
> Schmeer
> Subject: [vsnet-alert 4651] 1E 1719.1-1946 at supermaximum?
> 
> 
> The dwarf nova 1E 1719.1-1946 was still bright (mag 15) on an
> unfiltered CCD image taken with the IRO on Apr. 20.435 UT, and
> I would bet several million dollars (if I had them) that the
> current outburst is a supermaximum.
> The only previously observed outburst was detected by me on a 
> 1999 Oct. 11.098 (UT) IRO image (vsnet-alert 3571), but contrary
> to the current brightening this previous one was very short.
>  
> SIMBAD coordinates for 1E 1719.1-1946: 17:22:04.1 -19:49:09 (J2000.0)
> For a finding chart see P. Hertz et al. ApJ 364, 251-258 (1990).
> This CV is included in DS93 and DWS97 as 'Oph 2'.
> A VSNet comparison star chart is available (vsnet-chart 205).
> Also available is a sequence by Arne Henden at
> http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/1e1719.dat 
>  
> Time-resolved photometry during the current outburst is urgently
> required.
>  
> Clear skies,
> Patrick
>

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