[vsnet-alert 11690] Re: Probable New Dwarf Nova in Auriga

[Gianluca Masi]

Dear Colleagues,

After 4 hours of time resolved photometry, I was able to
track superhumps for this object, getting a Psh estimate of
1.697h. The total amplitude of this modulation is about 0.15
mag. The observations show that this new CV is a SU UMa
star.

You can see the resulting lightcurve here:
http://virtualtelescope.bellatrixobservatory.org/newvar_aur_25112009.jpg

The star faded about 0.05 mags during the run.

Data are going to be sent to Kyoto, for further analysis.

Regards,
Gianluca



----- Original Message -----
Da : Andrey Prokopovich <andrey.doctor at gmail.com>
A : vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Oggetto : [vsnet-alert 11686] Probable New Dwarf Nova in
Auriga
Data : Wed, 25 Nov 2009 01:26:04 +0200

> Timur Kryachko (Russia) report the new object (mag
> approximately 15.4) on the unfiltered images with
> exposition 300 sec (lim mag 21) taken Nov. 23, 2009 during
> of our variable stars search
> program with a Takahashi FRC-300 30-cm f/7.8 telescope (+
> Apogee Alta U9000 CCD camera) at KSU Astrotel
> Observatory (Karachay-Cherkessia, Russia).
> The new object is located at R.A. = 05h06m17s.35 +/- 0.5,
> Decl. = +35d47m38s.2 +/- 0.5 (equinox 2000.0).
> Nov. 22, 2009 object's mag is approximately 21, but Nov.
> 23, 2009 it's magnitude is 16. Only DSS2
> R-plate dated 1988-12-01 shows object's outburst, on the
> other archive DSS and 2MASS plates object is very faint.
> Magnitude variability table:
> 
>   Date       UT     Mag.
> 
> 2009 Nov. 22.9205 21.43 CR
>           23.7075 17.14 CR
>           23.8120 16.21 CR
>           24.6470 15.48 CR
>           24.7831 15.44 CR
> 
> Nov. 22 and Nov. 24 images animation:
> http://www.makhaon.com/_files/nova_Aur.gif