[vsnet-alert 7232] Re: 1RXP J113123+4322.5 superhump period

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

Re: 1RXP J113123+4322.5 superhump period

> Using combined data with the Kyoto observation, we performed period 
> analysis and obtained the best period to be 0.06495(2) d.

   The superhump period is a relatively short one (close to those of
UV Per, TV Crv, EK TrA, OY Car, VY Aqr), many of which show relatively
infrequent outbursts and large outburst amplitudes.  Accurate
identification of the quiescent counterpart and accurate measurement
of the outburst amplitude are therefore very important.

   However, the early appearance (as judged from the comparison with
the visual light curve) of genuine superhumps looks somewhat unusual
for a short-period system, which usually shows a delay of 2-3 day
before the full growth of superhumps.

   Another possibility may arise, considering the known clustering
of superhump periods of ER UMa stars around this period.  ER UMa stars
are known to show very quick development of transient large-amplitude
superhumps during the earliest stage of superoutbursts (cf. Kato et al.
1996, PASJ 48, L5).  The present phenomenon observed in 1RXP J113123+4322.5
may be somehow related to early-stage superhumps in ER UMa stars.
Since these superhumps are known to quickly decay in ER UMa stars,
further detailed (dense) observations are strongly encouraged.
This star is selected as the top-priority midnight target for northern
VSNET campaigners.

   Please remind to send your observations to Uemura-san and Ishioka-san
uemura@kusastro.kyoto-u.ac.jp and ishioka@kusastro.kyoto-u.ac.jp
in order to assure a quick analysis.

Regards,
Taichi Kato
VSNET Collaboration team

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