[vsolj-alert 742] XTE J1118+480: superhumps? and fading trend

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

From owner-vsnet-alert@kusastro.kyoto-u.ac.jp Tue May  9 13:13 JST 2000
To: vsnet-alert
Date: Tue, 09 May 2000 13:00:50 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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Subject: [vsnet-alert 4796] XTE J1118+480 slight decline?
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XTE J1118+480 slight decline?

   From recent data observed at Kyoto, XTE J1118+480 shows 
slight decline.

**** Recent nightly averaged Kyoto data ****
     UT     mag   data num. (30s exp.)
Apr. 17.67 12.88     690
     25.51 12.92     405
May   3.61 12.92     712
      5.58 12.93     465
      7.64 12.96      60
      8.56 12.95     525

   From last night observation, the hump becomes clear, indicating 
the amplitude of short-time fluctuation becomes small and
the amplitude of 0.17d hump becomes large (about 0.1 mag).
The slower rise and faster decline are seen in the last night hump 
which is different from recent superhump-like feature.

   The hump profile has strangely changed since the end of April.
The time-series photometry for more than 4 hours is strongly urged.

Regards,
Makoto Uemura and Taichi Kato
on behalf of VSNET XTE J1118+480 collaboration team

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