V4641 Sgr entering new period of activity

Details V4641 Sgr entering new period of activity V4641 Sgr entering new period of activity

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005atel..540....1k&link_type=abstract

The Astronomer's Telegram, #540

Astronomy and Astrophysics

Astronomy

1

Optical, Request For Observations, Binaries, Black Holes

Scientific paper

We observed V4641 Sgr with 1.5-m Russian-Turkish telescope (RTT150) on June 27 from 00:08 till 00:53(UT) in response to HETE alert distributed through Bacodine. The observations were continued during the following two nights on June 27 from 21:24 till June 28 00:53 (UT) and on June 28 from 22:02 till 23:41 (UT). The source was variable during the first night in Rc filter in a time scale of approximately 30 minutes and was brighter by 0.1 mag than the corresponding phase in its light curve in quiescence, showing that source is now entering a new period of activity.

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