Information_on_Star_Clock_for_instructors_and_students -...

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H-R Diagram lab helpful websites and information Information on Star Clock for instructors and students: For the star of the selected mass plots changes of the following quantities with age: Page 1 "Luminosity": Logarithm of the luminosity (unit of the latter: solar luminosity). Page 2 "Surface temperature": Logarithm of the effective temperature (expressed in kelvins). Page 3 "Radius": Logarithm of the star's radius (computed from the luminosity and the effective temperature) expressed in solar radii. Page 4 "Central chemical composition": Chemical composition, more exactly the mass fraction of hydrogen (H), helium (He), carbon (C12), oxygen (O16) and nitrogen (N14) at the star's center. In the diagram, the mass fractions of the individual elements are graphically added. For example, during the main-sequence evolution, total mass fraction of H and He is nearly constant and equals to 0.98 (the rest, 0.02, is the metal mass fraction Z). Note that the diagram has nothing to do with the star's radial structure!
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Information_on_Star_Clock_for_instructors_and_students -...

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