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Very Fast Fading of the Recurrent Nova M31N 2008-12a during the Most Recent Eruption

ATel #6546; K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), H. Kucakova, M. Wolf (Astronomical Institute, Charles U., Prague, Czech Republic)
on 6 Oct 2014; 14:37 UT
Credential Certification: Martin Henze (martin.henze@sciops.esa.int)

Subjects: Optical, Nova, Transient

We report multicolor photometry of the most recent outburst of the recurrent nova M31N 2008-12a (ATel #6527, #6532, #6535, #6537, #6540, #6543) acquired with the 0.65-m telescope at Ondrejov. The observations obtained during 3 nights gave the following magnitudes:

 
 
   Date UT        Band        Mag  
 
2014 10 03.738     R     18.24 ± 0.10 
2014 10 03.750     I     18.24 ± 0.11 
2014 10 03.807     R     18.27 ± 0.09 
2014 10 03.815     V     18.52 ± 0.10 
2014 10 03.822     B     18.65 ± 0.15 
2014 10 03.915     R     18.32 ± 0.08 
2014 10 04.083     R     18.38 ± 0.07 
2014 10 04.169     R     18.42 ± 0.10 
2014 10 04.929     R     19.4  ± 0.2 
2014 10 05.935     R     20.2  ± 0.3 
2014 10 06.161     R     20.1  ± 0.3 
 
The observed colors of the nova are in very good agreement with the magnitudes published in ATel #6543. Using results of our R-band photometry together with Sloan r' and R-band magnitudes published in ATel #6535 and #6543 we derived a decline time t2(R) = 2.7 ± 0.5 days, which is an even faster fading than the object had in the previous eruptions, see Darnley et al. (2014). In our analysis, we presume a maximum magnitude R = 18.2 and no re-brightening on the decline branch, i.e. similar lightcurve properties as during the previous outbursts, see Darnley et al. (2014).