The chemical make-up of the Sun: A 2020 vision | Astronomy & Astrophysics (A&A)

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Volume 653 (September 2021)

A&A, 653 (2021) A141

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Table 4.

Present-day photospheric and proto-solar mass fractions of hydrogen (X), helium (Y), and metals (Z) for a number of widely used compilations of the solar chemical composition.

Source	Present-day photospheric				Proto-solar
	X_surface	Y_surface	Z_surface	Z_surface/X_surface	X_initial	Y_initial	Z_initial	Z_initial/X_initial
Present work	0.7438	0.2423	0.0139	0.0187	0.7121	0.2725	0.0154	0.0216
Lodders 2019	0.7389	0.2463	0.0148	0.0200	0.7061	0.2766	0.0173	0.0245
Caffau et al. 2011^(a)	0.7321	0.2526	0.0153	0.0209
Asplund et al. 2009	0.7381	0.2485	0.0134	0.0181	0.7154	0.2703	0.0142	0.0199
Lodders et al. 2009	0.7390	0.2469	0.0141	0.0191	0.7112	0.2735	0.0153	0.0215
Asplund et al. 2005a	0.7392	0.2485	0.0122	0.0165	0.7166	0.2704	0.0130	0.0181
Lodders 2003	0.7491	0.2377	0.0133	0.0177	0.7111	0.2741	0.0149	0.0210
Grevesse & Sauval 1998	0.7347	0.2483	0.0169	0.0231	0.7062	0.2750	0.0188	0.0266
Grevesse et al. 1993	0.7028	0.2800	0.0172	0.0245
Anders & Grevesse 1989	0.7065	0.2741	0.0194	0.0274

Notes.

^(a)

Caffau et al. (2011) determined the abundances of Li, C, N, O, P, S, K, Fe, Eu, Hf, Os, and Th and adopted the recommended values of Lodders et al. (2009) for all other elements. They did not quote any proto-solar mass fractions.

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