[vsnet-alert 24476] Re: ASASSN-20iv: new SU UMa-type dwarf nova candidate

[hambsch at telenet.be]

There were no clouds during the observations. The star was dimming below mag 18 or so. Inspection of the images during analysis showed nicely the dimming and brightening of the target.
Josch
----- Oorspronkelijk bericht -----
Van: Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>
Aan: suuma at yahoogroups.com, variable star forum <variable_star_forum at yahoogroups.com>, vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp, vsnet-alert at yahoogroups.com, vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp, vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp, vsnet-newvar at yahoogroups.com, vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp, vsnet-outburst at yahoogroups.com
Verzonden: Mon, 27 Jul 2020 00:52:14 +0200 (CEST)
Onderwerp: [vsnet-alert 24474] Re: ASASSN-20iv: new SU UMa-type dwarf nova candidate

Re: ASASSN-20iv: new SU UMa-type dwarf nova candidate

> The light curve shows a clear superhump-like modulation with a period of
> 0.0883(1) d.
> But the modulation amplitude is at least larget than 1 mag (even
> considering the magnitude error), and thus this modulation can be noise.

   I have seen such large-amplitude superhumps only
in eclipsing systems.  It may be that this object
is also eclipsing, but eclipses may have not been
detected since the object is faint (around 17-18 mag).
Josch probably answer this question (whether the gaps
were clouds or non-detection from eclipses).