Hi to all of Steemit's colleagues, I am a volunteer and for today I will talk a little about the creation of stars, specifically the protostars. I hope it is of your interest and that you enjoy it.
A star always goes through a period of evolution, from its birth to the day of its death, a process that lasts millions of years to complete. In its birth and initial formation you can find elements such as helium, hydrogen and star dust all compressed because of the force of gravity, this process of initial evolution is what is known as protostars.
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A star that has a mass similar to ours (the sun) takes to complete this process in about 100 million years but a star with a larger mass, we talk about 15 times the mass of our star, it would take about 100 thousand years in this process, less time as a result of having greater gravitational field which accelerates the process and also, the life time of the star itself.
In this process is where they begin to initiate thermonuclear processes inside, the center begins to warm up and then release large amounts of energy burning the fuel it has. In proto-stars it is said among scientists that Bok globules with a density of about 1,000 times greater than common nebulae can be found and that they also have a diameter between 0.05 and 0.5 parsec.
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This process is completed when the star reaches the main sequence in the diagram of Hertzsprung-Russell, during all this time you can only see the star in the form of a molecular cloud in which several stellar points are formed, the elements contract not in a uniform way forming several stars together that are still contracted between together and fragmenting and forming several protostars within what is known as a cluster.
You can see many cumulus clouds and different superclusters in the vacuum of the universe, one of them is the supercluster of virgo, which instead of stars is composed of more than a thousand galaxies inside, this is the closest cluster to ours and it is difficult to appreciate because of its size so extensive.
Stage where a protostar is found
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The protostars radiate the half that contributes the gravitational collapse, the other half is invested in heating the nucleus. The heat is transported to the surface entirely by a convection process due to the highly ionized material slowing down photons, preventing a good efficiency of radioactive transport.
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This process can be called in a few words as the attempt of a nebula to maintain balance between internal forces and gravity.
Sources:
http://astronomia.wikia.com/wiki/Protoestrella
http://www.astromia.com/glosario/protoestrella.htm
http://www.geocities.ws/observerdelcielo/protostar.html
That was all for today, thanks for reading and if you like give me your vote and follow me in @rcrdoo for this and more types of content, I hope you liked it, greetings and have a good life...
