• Claudio Vita-FinziEmail author
Part of the SpringerBriefs in Astronomy book series (BRIEFSASTRON)


Modern estimates of the Sun’s age are based primarily on two sources: the isotopic age of components of chondritic meteorites (particularly calcium-aluminium-rich inclusions or CAIs) which are thought to have originated in the solar nebula, and the implications of the Standard Solar Model (SSM), for which helioseismology now provides corroboration. The generally accepted result is ~4.57 Gyr. The protoSun joined the Main Sequence, as depicted on Hertzsprung-Russell diagrams of stellar luminosity and temperature, about 40 Myr later, when its luminosity had supposedly fallen to 70 % of that characterising Main Sequence stars with a mass similar to that of our Sun. Modern counterparts of the protoSun include naked T Tauri and FU Orionis stars; 21Ne from chondrites appears to indicate flare activity on it 100–1000 times the present level.


ProtoSun Hertzsprung-Russell diagram Main Sequence Helioseismology T Tauri Chondrite CAI Standard Solar Model 


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Copyright information

© The Author(s) 2013

Authors and Affiliations

  1. 1.Department of MineralogyNatural History MuseumLondonUK

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