[vsnet-chat 3716] RE: re vsnet-alert 5312 (delta Vel)

[Sebastián Otero <varsao@fullzero.com.ar>]

Hi, John and all the people:

You have written:

>"Note to eclipsing binary people : IF it turns out to be star A that is
eclipsing, and given that star a orbits A in say 40 to 70 years, what are
the chances, and more importantly timescale, of the "third body" affect via
apsidal motion causing star A's orientation to go in and out of suitability
for eclipses to occur?  In other words, if this star has not been detected
as an eclipser in the past, is it at all possible that is is simply because
it has only started being so over the past few years, after a long period
of not doing so, due to apsidal motion... ...if you follow?!?!"


Well, reading the last Sky & Telescope issue I found the SS Lacertae
example:
the star began to show eclipses in the late 1800's and and stopped showing
them in the middle of the 20th century. As John proposed, a third star could
have made it happen by its gravitational influence.

So, we'd better hurry up because maybe we don't have all the time in the
world to enjoy delta Velorum eclipses!!!!

Regards,
Sebastian.

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp