[vsnet-campaign-be 122] Re: Delta Sco: Provisional Spectroscopic Period and Orbit

["Sebastian Otero" <varsao@fullzero.com.ar>]

> An ephemeris of predicted times of putative
> eclipses is also provided; a comparison to recent photometry was not
> done.
>
>         P  = 78.860 +/- 0.0017 days
>         T  = JD 2442776.075 +/- 0.17
>         e  = 0.10 +/ -.17
>         w  = 254.9 +/- 95.04
>         V0 = -12.2 +/- 1.5 km/sec
>         K  = 10.3 +/- 2.4 km/sec
>
>         T Min. I  = JD 2427769.523 + 78.860*E
>         T Min. II = JD 2427728.773 + 78.860*E


Hi, Thom:
                 No trace of eclipses can be found in the PEP and visual
recent photometry, and most important in the three year Hipparcos data.
Although the lightcurve may have been affected by the eruption, certainly
the eclipses wouldn't have appeared or disappeared because of this.
                 However, maybe there IS an eclipse but not of a star but
the ejected ring. Maybe that's the reason of the cyclic variations seen. The
same goes for the BCEP possibility: how could the amplitude be increased
that much? And, of course, a 78 days cycle has nothing to do with the less
than a day periods of those stars. So the star is a BCEP variable but the 75
or 78 days cycle needs to be explained in other way.

Cheers,
Sebastian.

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