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Life Cycle Phases of a Star

Life Cycle Phases of a Star. N ebula. A nebula is a cloud of dust and gas. This is the birth place of stars The gases here are primarily hydrogen (@90%) helium (@9.9%) oxygen, and other gases and some dense solids (@ .1%). P rotostar.

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Life Cycle Phases of a Star

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  1. Life Cycle Phases of a Star

  2. Nebula • A nebula is a cloud of dust and gas. This is the birth place of stars • The gases here are primarily hydrogen (@90%) helium (@9.9%) oxygen, and other gases and some dense solids (@ .1%).

  3. Protostar • A portion of a nebula that is turning into a star. • Gases and dust are condensing. • When it develops enough density, it begins to collapse on itself. • When it collapses, gas molecules crash together in nuclear fusion – • this produces heat and light energy.

  4. Three main star types • Main Sequence These stars are almost identical to the state that they were born in. They neither expand nor contract great amounts, and will die fairly non-explosive deaths. Famous examples are our Sun, Sirius, Spica, and Vega. • Giants and Super-Giants As the Sun, and others in the main sequence, grow older they begin to expand. While expanding, more light is given off. These are giants. Stars that start off much more massive than the Sun will be able to expand that much more and reach redsuper-giant status. Famous examples are Betelgeuse, Polaris, and Rigel.

  5. Nova As a star begins to die, the remaining stellar mass gets blown into space, called a nova (sometimes violently, i.e. supernova). • Dwarfs After the material has been ejected, all that remains is a small, very-dense dwarf star. Dwarfs are stars at the end of their life-cycle. It is impossible to keep up giant status for very long without running out of fuel.

  6. HertzsprungRussel diagram

  7. Black Hole • If the star started off heavy enough and large enough, and the right conditions existed, the star might become a black hole. • Black holes are the cold remnants of former stars, so dense that no matter—not even light—is able to escape their powerful gravitational pull.

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