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A probable outburst of a known star normally shining at mag 19-20. From follow-up I read that now should be around mag 12.8 (unfiltered) and could be a dwarf nova like SU UMa or WZ Sge. I have not yet found any spectra.

IAUC TOCP:
http://www.cbat.eps.harvard.edu/unconf/ ... 26152.html

My attempt in very bad weather conditions. Less than hour with several clouds passage and high turbulence...



It show a blue continuum nearly featureless (at spectrum resolution/SNR) interrupted by h-beta and h-gamma broad absorption hydrogen lines. Other features are very weak. The subject is not very easy, it requires a longer exposure time.

Slit view through C9.25 f/10 and Lhires III:



Paolo

The observation of 7.759 march reported on CBAT follow-up:



Paolo

New observation of 12 march. Target is less bright but integration is greater:



An unusual thing about 7 march observation. I took 18 x 360 s frames but were used first 13 for spectrum profile extraction due to poor SNR of last frames (for weather problem). While I was checking results depending on used frames, I noticed that profile was slightly different, not only for noise level. So I tried to divide frames in two group, 1-9 and 10-18, obtaining two profiles that show some differences (apart SNR) indicated by arrow:



I wonder if these rapid changes happened in about 1.3h are true (instrinsic of the CV star) or are part of random fluctuations for low SNR.

Paolo

That's not impossible Paolo
Here's a list of publications about spectroscopy of dwraf novae outbursts
http://www.astronomie-amateur.fr/Docume ... tburts.pdf
There's not so much survey of dwarf novae in outburst
Time series should be a good subject
François

Thank you François, very interesting papers. I hope to observe a brighter dwarf nova or CV outburst in future!

Paolo