[vsnet-campaign-be 71] Delta Scorpii ten year cycle.

[Sebasti若n Otero <varsao@fullzero.com.ar>]

Hi, all:
          Gathering delta Scorpii's data, I realized that the only other
time when the star was measured brighter than normal (V= 2.21 instead of
2.32) was back in 1958.(Hogg A.R.). Taking the orbital period from Fabregat,
Reig and Tarasov (2000) P= 10.583 and the ephemeris from Hartkopf et al.,
(1996)  To = 1979.41 , we find that another periastron passage had taken
place in 1958.24.
          It is very interesting to find this, because it's a very good
indicator of the relation between the binary nature of the system and the
observed events.

Cheers,
Sebastian Otero,
LIADA,
Buenos Aires,
Argentina.

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