On Jun 8, 11:33 am, BradGuth  wrote:

So, you're saying that gravity is what primarily creates stars and
> gravity is also what keeps stars (regardless of however near one
> another) apart?

I didn't say that at all. True, gravity is responsible for star
formation. It is actually the lack of gravity that accounts for the
evaporation of a cluster. From Wiki;

"All stars form in clusters, but most clusters break up less than 50
million years after star formation concludes. The astronomical term
for this process is "evaporation." Only extremely massive clusters,
orbiting far from the Galactic center, can avoid evaporation over
extended timescales

> Somewhat related:  Dark Matter Halo Simulation (looks damn big)
>  http://en.wikipedia.org/wiki/Dark_matter_halo

What does the theory of Dark Matter have to do with star clusters in
general and Sirius in particular?
>
> What was the initial Sirius ABC combined solar wind maximum density
> and velocity (say for the first thousand or million years when it was
> new and really going to town, so to speak)?

There is no Sirius C and there never has been. See the bottom of this
page;

http://www.solstation.com/stars/sirius2.htm

> How soon after the fairly recent stellar birth of Sirius B do whatever
> planets and moons form?

What do you mean by the 'fairly recent birth of Sirius B'? You need to
perform due diligence before saying things like this. Sirius A and B
were most assuredly born at the same time from the same cloud. Read
the previous link from the top. Sirius A is a 2-3 solar mass star, and
Sirius B WAS a 5 solar-mass star, before evolving to its present white
dwarf stage.

I have no idea about any planet formation around either one of these
guys. If you do, I would like to see the reference.

\Paul A