Time: 3:00–4:00 pm
Date: Wednesday, August 27, 2014
Location: CG1 – 2126 (also webcast at http://www.fin.ucar.edu/it/mms/cg-live.htm)
Title: On the main-sequence age of the Sun
Traditionally the age of the Sun is estimated as being the same as that of the oldest meteorites, which are believed to have been formed in the solar nebula. That is a very precise measure. It is much more precise than can presently be judged directly from the properties of the Sun itself. But is it accurate? For some decades I and others have been trying to calibrate theoretical solar models to assess the Sun's age, basically via the the amount of hydrogen that has been converted into helium in the core. The outcome depends on the many (generally accepted) assumptions on which the theory of stellar evolution depends, and upon many, if not all, of which some doubt must be cast. To many scientists, that doubt must render the exercise fruitless. However, I believe that the honing of such a calibration, however preliminary, is a necessary step towards not only addressing the reliability of those assumptions, but also for pursuing the ultimate goal: to determine whether or not the Sun condensed from the interstellar medium before or at the same time as the other condensed bodies in the solar system.
- UCAR Home
- About Us
- For Staff