Optical observations of V4641Sgr

Details Optical observations of V4641Sgr Optical observations of V4641Sgr

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..297....1r&link_type=abstract

The Astronomer's Telegram, #297

Astronomy and Astrophysics

Astronomy

4

Optical, Request For Observations, Black Holes

Scientific paper

The X-ray binary system V4641 Sgr (=SAX J1819.3-2525) was observed in Rc band with the 1.5-m Russian-Turkish telescope RTT150 at TUBITAK National Observatory (Turkey) during the period 18:57-21:57 UT, July 5, 2004. The Rc magnitude of the source averaged over all observations was m_Rc~13.5, that is slightly higher than that in its quiescent state at this orbital phase. We obtained a lightcurve with time resolution 13.5 sec.

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