I found informations showing that many stars in Orion nebula is actually proto-stars, with circumstellar disk of dense gas surrounding them, called proplyds. (
http://en.wikipedia.org/wiki/Protoplanetary_disk).
That is the case of G, H and I.
Image from Hubble of protostars in Orion nebula:
http://www.spacetelescope.org/news/heic0917/
Attached we have the Hubble image of G star.
It seems that G were, or yet is, two proto-stars, that is becoming into a single star by stealing the material and/or gas from compainion.
Esa says in
http://www.spacetelescope.org/images/heic0917ba/:
Quote:
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This tadpole-shaped proplyd’s tail is actually a jet of matter flowing away from the excited cusp.
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Maybe in the final stage it will be a binary system !
A more complete report I am doing in
http://jsmastronomy.30143.n7.nabble....d377.html#a381