OIR activity in V4641 Sgr

Details OIR activity in V4641 Sgr OIR activity in V4641 Sgr

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005atel..542....1b&link_type=abstract

The Astronomer's Telegram, #542

Astronomy and Astrophysics

Astronomy

3

Infra-Red, Optical, Binaries, Black Holes, Transients

Scientific paper

We have obtained V- and H-band images of V4641 Sgr using the ANDICAM instrument on the SMARTS 1.3m telescope at CTIO. Images taken on UT 2005 June 26.3 show that V4641 had significantly increased in brightness with respect to average quiescent magnitudes. The H-band magnitude for this time was 11.6 and V-H = 1.63. Data taken on UT 2005 June 29.2 and 30.3 indicate that V4641 Sgr has returned to average quiescent magnitude levels in both V- (~ 13.7 mag) and H-band (~ 12.6 mag) with V-H = 1.1.

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