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[vsnet-outburst 3092] DM Dra : analysis of the Nov 14/15 observations at CBA Belgium Observatory
Dear colleagues,
I have just concluded the observing session of DM Dra, and herewith provide
some further details about my findings. Thanks also to Timo Kinnunen for his
timely visual detection of this outburst !
- Observing time : 2001, November 14/15
- Duration : 4.1 hours
- Equipment : 0.35-m f/6.3 telescope and unfiltered ST-7 CCD
- Data points : 269
The light curve shows genuine (single-peaked) superhumps with an amplitude
of 0.36 mag and a period of 0.0734 +/- 0.0030 d (PDM technique). This value
substantially differs from CCD photometry in quiescence by Howell et al.
(PASP 102, 758), which suggested a possible periodicity in the system of 125
minutes, and a potential eclipse (0.4 mag in 5 minutes). The latter is not
present in my observations neither.
The above observations firmly establish DM Dra as a new SU UMa type dwarf
nova. To further refine the superhump period (longer baseline) and to study
the evolution of the outburst development, I would recommend this object to
receive sufficient attention from other observers worldwide. Unfortunately
(?), I will not be able myself to follow up the DM Dra outburst in the next
days, because of my Leonids expedition.
I have published the light curves, an outbursting image and additional
details on DM Dra on my web site. Have a look !
Kind regards,
Tonny Vanmunster
CBA Belgium Observatory
http://vsnet.lunarpages.com/cbabelgium
email : Tonny.Vanmunster@advalvas.be
vsnet-adm@kusastro.kyoto-u.ac.jp
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