Fig3_9 Element abundance in solar photosphere

Fig3_9 Element abundance in solar photosphere

Fig. 3.9 . The relative abundance of the elements in the Sunís visible disk, the photosphere, plotted as a function of atomic number. The atomic number, denoted by Z, is the number of protons in the atomís nucleus, or roughly half the atomic weight. Heavy elements, with high atomic number, are less abundant than light ones, with low atomic number, and the most abundant element in the Sun is the lightest element, hydrogen. Helium is the second most abundant solar element. The abundance data are plotted in a logarithmic scale normalized to a million million, or 1.0 x 1012, for hydrogen. [Adapted from Martin Asplund, Nicolas Grevesse, A. Jacques Sauval and Pat Scott, The Chemical Composition of the Sun, Annual Review of Astronomy and Astrophysics 47, 481-522 (2009).]

Copyright 2010, Professor Kenneth R. Lang, Tufts University