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Why is the presence of large amounts of helium in the spectrum of a star generally considered to be asign of age?
Wiki User
∙ 14y ago
When stars form they are mostly made up of hydrogen.
Main sequence stars derive their energy from converting hydrogen in helium in the cores. As the star ages the ration of helium to hydrogen increases. A star with a lot of helium there for must be old.
When the hydrogen has exhausted in the core the star begins to collapse due to gravity until it reaches a point that the temperature of the core is sufficient to fuse Helium into Carbon.
Wiki User
∙ 14y ago
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Why is the presence of large amounts of helium in the spectrum of a star generally considered a sign of age?
Stars begintheir lives burning hydrogen and converting it to helium. If there are large amounts of helium in a stellar spectrum, it would indicate that the star has been making helium for a long time - hence age.
How do raindrops produce a spectrum?
Rain droplets can refract light. Different colours refract in different amounts so a spectrum is produced.
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