APOD: M16: Pillars of Creation (2007 Feb 18)
Posted: Mon Feb 19, 2007 2:40 pm
http://apod.nasa.gov/apod/ap070218.html
Observing the stellar nursery it came to my mind that not necessarily all the gaseous globules have origin within a particular interstellar dust cloud. It is quite possible, that in the galaxies many sub-solar celestial bodies invisible to us are roaming around. In particular moment of time when they are surrounded by one of the interstellar dust clouds, they accrete more material and eventually become stars. If they don’t become stars, after the dust is blown away by stellar (solar) winds, they become invisible again even to Hubble, and continue roaming through the universe a little bit heavier until next encounter with the interstellar gas.
It is also quite obvious that because of stellar winds gravitational separation of dust/gas must occur. The lighter molecules are blown away and they travel by far greater speed than heavier ones. If the bodies are accreting a matter from the cloud lanes composed of heavier elements, the ratio between lighter and heavier elements is in flavor of the latest. If they become stars, they eventually still accrete the heavier dust particles, while light ones are blown away. Consequently the heavier stars must have ratio light/heavy elements in the favor of the heavier ones.
:idea:
Observing the stellar nursery it came to my mind that not necessarily all the gaseous globules have origin within a particular interstellar dust cloud. It is quite possible, that in the galaxies many sub-solar celestial bodies invisible to us are roaming around. In particular moment of time when they are surrounded by one of the interstellar dust clouds, they accrete more material and eventually become stars. If they don’t become stars, after the dust is blown away by stellar (solar) winds, they become invisible again even to Hubble, and continue roaming through the universe a little bit heavier until next encounter with the interstellar gas.
It is also quite obvious that because of stellar winds gravitational separation of dust/gas must occur. The lighter molecules are blown away and they travel by far greater speed than heavier ones. If the bodies are accreting a matter from the cloud lanes composed of heavier elements, the ratio between lighter and heavier elements is in flavor of the latest. If they become stars, they eventually still accrete the heavier dust particles, while light ones are blown away. Consequently the heavier stars must have ratio light/heavy elements in the favor of the heavier ones.
:idea: