[vsnet-alert 10581] V4641 Sgr: optical observation

[Makoto Uemura]

V4641 Sgr: optical observation

Our recent observation of V4641 Sgr shows a possible activity 
on 14 Oct.

YYYYMMDD(UT)  V    V_err  Observatory
20081009.448 13.58 0.02  Higashi-Hiroshima Observatory
20081014.392 13.37 0.01  Higashi-Hiroshima Observatory
20081015.391 13.72 0.01  Higashi-Hiroshima Observatory

Tonight (15 Oct), we have observed it and found that 
it was faint at its quiescent level.  

We also took a low-resolution spectrum tonight (15 Oct), 
which shows no prominent emission line.  
The optical emission is currently dominated by the emission 
from the secondary star.

Follow-up observations are urged.

Regards,
M. Uemura, M. Yamanaka, M. Sasada, Y. Ikejiri, and A. Arai
on behalf of the KANATA team