[vsnet-alert 22668] Re: ASASSN-18yi: superhump period

[Keisuke Isogai]

> The mass ratio estimated from the
> orbital period and superhump period is 0.338(3) d.
This mass ratio is too large in comparison with the theoretical limit of
the 3:1 resonance of q~0.25-0.3. And the object has been around
15.5 mag for one week. Such a flat light curve is not seen in ordinary
superoutbursts. Thus the modulations may not be superhumps.
Confirmation is needed.

On 2018年11月01日 02:31, Yasuyuki WAKAMATSU wrote:
> ASASSN-18yi: superhump period
>
> Josch Hambsch, Berto Monard and Itoh-san reported observations.
>
> The object shows deep eclipses with the period of 0.16825(3) d, which is
> above the
> period gap. The superhump period is 0.1857(1) d. The mass ratio
> estimated from the
> orbital period and superhump period is 0.338(3) d. This value is also
> quite large for the
> SU UMa-type dwarf nova. The object maintains the magnitude of 15.5 mag.
> Further observations are encouraged.
>