Old photographic observations of V4641 Sgr (Goranskij's
GM Sgr candidat), the counterpart of X-ray source
Taking into account the result by Watanabe P=2.5 days
in outburst, I reconstruct old set of photographic observations
being partly lost, and add some new observations.
A total is of 289 data points. The observations were taken with
the Crimean 40-cm astropraph. The periodogram calculated with
the method by Lafler and Kinman is shown.
The frequency spectrum calculated using Deeming method shows
mach more periodic components.
The last periodogram indicates peaks corresponding following
possible periods with the double-wave light curve:
0.4236, 0.4650, 0.5379, 0.6064, 0.7365, 0.871, 1.168,
1.5437, 2.8173, and 6.89 days.
One of them, 2.8173 day, is close but non-equal
to Watanabe's value. The light curve with this period is
shown in the following Figure.
VLA radio interferometric observations of jet in V4641 Sgr