Astrophysics (index)

Abundances

(Abundances Of The Chemical Elements)
(relative amounts of each chemical element)

The Abundances Of The Chemical Elements (or just Abundances) are of interest in astronomy in finding explanations fitting astronomical theories to observations that such abundances in stars, planets, Moons, and the Interstellar Medium (ISM) can be worked out with some reliability through Spectroscopy, and study of Albedos, and knowledge of basic physical and chemical processes allow more conclusions to be drawn.

There is some consistency in the abundances of objects in the solar system, including the Sun, showing differences with other stars, suggesting the solar system formed together and stars formed separately inherit abundance characteristics from the material that forms them, e.g., Molecular Clouds. Given this conclusion, any divergence from the general abundance throughout the solar system (e.g., the sun's lack of Lithium (Li) or Earth's lack of Hydrogen (H) and plethora of Oxygen (O)) demands reasonable explanation.

Theory is called on to explain the observed abundances of the solar system and other stars based upon that of molecular clouds, and that on Nucleosynthesis, such as that within stars and supernovae (SN), and so on, back to the Big Bang.


(chemistry,science)
http://en.wikipedia.org/wiki/Abundance_of_the_chemical_elements

Referenced by:
Deuterium (D)
Iron Peak
Lego Principle
Metallicity (Z)
R-Process

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