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V4641 Sgr short-term variations
We performed CCD time-series observation for 4 hours last night
at the Ouda observatory with a 60-cm telescope.
Our B-band observation was done with an exposure time of 2 sec
yielding a time resolution of 4 sec.
The light curve shows 100-sec time-scale variations
with amplitudes of 0.05-0.10 mag. A relatively large hump was also
seen around August 6.62 UT (amplitude ~ 0.2mag).
The light curve is similar to that we observed on 2002 May 24,
around the maximum of the last active state.
There is a sign of further shorter time-scale variations.
More detailed analysis is now ongoing.
We will continue observation at Ouda tonight if we have clear sky.
Regards,
Makoto Uemura
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
