[vsnet-alert 7272] V589 Her: short brightness dip? eclipse?

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

V589 Her: short brightness dip? eclipse?

Dear Colleagues,

    The Kyoto team (observers: M. Uemura and R. Ishioka) obtained a 1.4-hour
run on Apr. 5 (and a shorter run on Apr. 4).  Both observations confirmed
the reported outburst.

    Superimposed on smooth 0.1-0.15 mag variation, there was a short 0.3 mag
apparent fading.  The profile of the fading resemble that of an eclipse.
Owing to the short visibility in the morning sky, we have not been able
to confirm whether the feature recurs.  If this is a true eclipse, the
short duration suggests a short orbital period, possibly SU UMa-type
category (in this case, superhumps, if any, may have been hard to detect
depending on the beat phase).  Otherwise, the phenomenon may be related
to some sort of other "dips" sometimes seen in various CVs.

    Further follow-up observations are very urgently requested.  Please
remind to also send observations to Uemura-san and Ishioka-san
(uemura@kusastro.kyoto-u.ac.jp, ishioka@kusastro.kyoto-u.ac.jp)
for prompt analysis.

Regards,
Taichi Kato
VSNET Collaboration team

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