[vsnet-alert 22178] Re: [vsnet-outburst 22181] ATLAS18olb: modulation?

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

Dear colleagues,

I have submitted 4 nights of observations of ATLAS18olb to the VSNET team, using the designation AT 2018blk for this variable. My data were obtained on 2018, May 16-17-18-19 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and ST-10XME CCD camera, and at CBA Extremadura Observatory, using a 0.40-m f/5.1 telescope and Trius SX-46 CCD. 

In total, this represents over 600 observations covering a time span of 10.95 hours. A period analysis on the entire data set, using the ANOVA, Lomb-Scargle and PDM methods (Peranso), yields a weak signal with an amplitude of 0.06 mag and a very preliminary combined period of 0.049 +/- 0.001d (or 0.090 +/- 0.001d).  

Further observations are needed to more accurately determine the period.

Best regards
Tonny


Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
www.cbabelgium.com
www.peranso.com


-----Original Message-----
From: vsnet-outburst [mailto:vsnet-outburst-bounces at ooruri.kusastro.kyoto-u.ac.jp] On Behalf Of Keisuke Isogai
Sent: zaterdag 19 mei 2018 4:18
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp; vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp
Subject: [vsnet-outburst 22181] ATLAS18olb: modulation?

ATLAS18olb: modulation?

     Kiyota-san, Roger Pickard, Crimean Obs. team (reported by E. Pavlenko), Itoh-san, Ian Miller and Pavol A. Dubovsky have reported the observations.
The object seems to show very weak modulations. The profile is double wave like early superhumps. Although the most likely period is 0.08 d, it is too large for WZ Sge-type DNe.
     Further observations are encouraged to establish the period.