Ok, I found an excellent text about the Trapezium Cluster. It is very very more amazing than I could imagine.
The complete text is in the link:
http://www.astropix....MPLE/SAMPLE.HTM -
Jerry Lodriguss from the book Astrophotographer's Guide to the Deep Sky
I retrieve some informations that I saw as very important:
It's age is estimated to be less than a million years old and is located at a distance of about 1,337 light-years.
All four main stars are hot class O and B stars.
Trapezium, is a complex star cluster called the Orion Nebula Cluster (ONC).
It involves many multiple star systems.
There are about 1,000 young, hot stars involved in the cluster.
They are crowded into a space about 4 light-years in diameter.
Most of the stars in the cluster are hidden by dust or in the light of the nebula, but are visible at the infra-red wavelengths.
H is a double. It is separated by about 1.6 arcseconds.
http://jsmastronomy.30143.n7.nabble....d377.html#a380
The Trapezium Multiple Main Star System
http://astronomia-e-astrofotos.10697...3/trapez-1.jpg
Star Magnitude Notes
A 6.72 - 7.65 Eclipsing Binary in 3-star system
B 7.0 - 8.65 Eclipsing Binary in 5-star system
C 5.13 Spectroscopic binary star
D 6.71 Double star
E 11.1 Spectroscopic binary star
F 10.12 Binary star
G 13.68 Single star
H 15.8 Double star
I 16.3 Single star
And from anothers sites we have:
It seems that about half of stars contain evaporating circumstellar disks, a likely precursor to planetary formation.
It is possible that an intermediate mass black hole with a mass >100 times larger than that of the Sun may be present within the Trapezium, something that could explain the large velocity dispersion of the stars of the cluster.
