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[vsnet-alert 7782] V4745Sgr climbing up again



Dear VSNETers,

V4745 Sgr has stared its 3-d major re-brightening since its
nova-outburst on Apr, 10.

Similarly as during the second  major re-brightening, low amplitude
(0.02
-0.05) modulation with period ~0.2 (>=0.1 tonight?) is clearly visible
on the rising branch (some traces of it are also visible on the
descending branch and before the third onset).

At this point resemblance to the dwarf novae is striking and one
plausible explanation is that (for the first time?) we see
disk-instability induced outbursts overlaid on the declining branch of
the nova light curve.

Continuous photometric monitoring would be required to
investigate hump period and its variation,
as well as time resolved spectroscopy would be of great importance.

ASAS data for V4745 (light curve + zoomed parts) area available at:
http://vsnet.astrouw.edu.pl/cgi-asas/asas_V4745SGR

Regards, Grzegorz Pojmanski, ASAS


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