[vsnet-outburst 27230] ASASSN-21hc: confirming as AM CVn object

[反保雄介]

ASASSN-21hc: confirming as AM CVn object

Josch Hambsch and Berto Monard have reported further observations of
ASASSN-21hc.
As predicted in vsnet-alert 25849, ASASSN-21hc now comes back around 14 mag
on 11th May.

Observations on 11th-12th May show clear superhumps with the period
of 0.02487(1) d and the amplitude of 0.05 mag, proving its nature as an AM
CVn object.
Therefore, the detected weak signal in vsnet-alert 25849 is likely a double
period of early superhumps.

Spectroscopy is needed, as well as photometric observations are encouraged
to follow the sueprhump period evolution.

Best,
Yusuke


2021年5月12日(水) 9:00 Taichi Kato <tkato at kusastro.kyoto-u.ac.jp>:

> ASASSN-21hc: suspected AM CVn object
>
>    Josch Hambsch has reported observations on five nights.
> The object faded rapidly on May 10, 0.6 mag in 0.2 d.
> The fading rate is compatible with an AM CVn object.
> A period analysis yielded a possible weak signal
> at 0.050 d, but this may have been spurious.
> The object is expected to brighten again and continued
> observations are requested.
>
>    Spectroscopy is urgently needed.
>


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京都大学大学院理学研究科宇宙物理学教室 D1
Kyoto University, Graduate School of Department of Astronomy, PhD candidate
反保 雄介 Yusuke TAMPO
MAIL: tampo at kusastro.kyoto-u.ac.jp

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