[vsnet-campaign-v4641sgr 21] V4641 Sgr: Monard's observation

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

V4641 Sgr: Monard's observation

(Forwarded message from vsnet-alert 7342)

  From behind the eyepiece V4641 Sgr seems to flicker at a very fast rate,
as was mentioned by other observers. The attached light function shows
that there is obvious activity at the minute level too.

CCD observations for the night 21-22 May show V4641 Sgr on a steady
return to a calm state. Just at the end (unfortunately dawn came so
early..) there was a strong sign of resuming activity.
This lightcurve has been sent to Kato-san.

Last night (22-23 May) we had heavy cloud and a downpour with thunder
activities (unusual for the time of the year). However the sky did open
after 3 o'clock and fast photometry (under humid conditions) showed
quite some detail in the activity at the 10 minute level. This was a
very rewarding run (and test trial on fast photometry) at the Bronberg
Observatory.

As mentioned above, I hereby attach the sub 3h run of this morning, 23
May. A plot of this lightcurve is a pleasure to the eye! 

Enjoy! 

Regards,
Berto Monard
Bronberg Observatory

[data omitted; see vsnet-alert 7342]

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