[vsnet-alert 22828] ASASSN-18abj: time-series analysis 2018, Dec 12/13

[Tonny Vanmunster tonny.vanmunster@gmail.com via vsnet-alert]

Dear colleagues,

I have just concluded the analysis of my 2018, Dec 12/13 V-filtered CCD photometry session of ASASSN-18abj. Observations were made at CBA Belgium Observatory,  using a 0.40-m f/10.0 telescope and STT-3200ME CCD camera. The sky was very clear throughout the session. 

 

The resulting light curve covers a time span of 3.6 hours. It clearly shows a pattern of irregular variations with amplitudes ranging between 0.025 and 0.050 mag on time scales of 8 – 22 minutes, possibly superimposed by some longer signals. I used the ANOVA, Lomb-Scargle and PDM period analysis methods (Peranso), but could not identify a prominent period.

 

The object was at mag 11.03 (V) on Dec 12th, 2018.

 

Based on the above, one can not (yet) firmly rule out if this is a galactic nova or a CV. Further optical and spectroscopic observations are urgently needed.

 

Observations will be sent to AAVSO, CBA and VSNET for further analysis. 

 

Best regards
Tonny


 

Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
 <http://www.cbabelgium.com> www.cbabelgium.com

 <http://www.peranso.com> www.peranso.com