V4641 Sgr: new optical flaring

Details V4641 Sgr: new optical flaring V4641 Sgr: new optical flaring

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..309....1b&link_type=abstract

The Astronomer's Telegram, #309

Astronomy and Astrophysics

Astronomy

5

Optical, Request For Observations, Black Holes

Scientific paper

We have performed photometric time-series observations (Rc-band) of X-ray binary system V4641Sgr with the Russian-Turkish telescope RTT150 at the TUBITAK National Observatory (Turkey) during the period of 18:33-23:32 UT, July 17,2004. Several optical flaring with increasing of brightness amplitude up to 0.6 mag have been detected. Obtained Light curve with the time resolution of 16.8 sec can be seen in http://db.rsdc.rssi.ru/V4641Sgr/2004/lc040717.jpg Orbital variations of V4641 Sgr in quiescence (Goranskij et al., Astron.Rep., 2003, v.80, N9) with data points obtained on July 17, 2004 can be seen in http://db.rsdc.rssi.ru/V4641Sgr/2004/ph040717.jpg Given strong optical variability the source obviously in some active state.

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