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Stellar Evolution


Here is a chart of the theoretical life cycle of a star. The term "Stellar Evolution" simply refers to this theoretical life cycle. As shown else where those objects called protostars could be dyeing stars rather then newly formed ones. In addition black dwarfs have never been observed. While the other components of this chart have been observed, the only transition that is based on observation is supper giant to supernova to Neutron star. There some observational evidence for the Giant to white dwarf transition, but it has never actually been observed. The rest is only theoretical, but they are based on sound scientific principles.

H-R Diagram


H-R Diagram

The H-R Diagram is a plot of a stars temperature and luminosity. It is a useful tool in comparing stars.

Testing stellar evolution is very difficult sense the interiors of stars cannot be seen. It would take an exceedingly long time to watch individual stars go through these cycles. Many stars are used to determine the sequences. Furthermore supernovas producing neutron stars are the only observed star changes associated with stellar evolution. This does not prove that any others occurs.


Globular Clusters

Globular Cluster M5

Stars, Sight, and Science": NSF Center for Adaptive Optics /
California State Summer School for Mathematics and Science

Globular clusters should provide a good test for both Stellar Evolution and the standard solar model.  According to evolutionary theories on star formation the stars in a cluster are all the same age. But big stars evolve faster than smaller ones. The H-R diagram should show a progressive pattern in spectral types.

Theoretical H-R diagram of  a globular cluster over time.

Stars, Sight, and Science": NSF Center for Adaptive Optics /
California State Summer School for Mathematics and Science

According to stellar Evolution theory the stars should form a nice neat line as shown above. Theoretically, the curve of the cluster changes as its ages. This model assumes both the standard solar model and that all the stars in the cluster are the same age as predicted by the Nebula Hypothesis.

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M5 ( Messier #5 )
H-R Diagram

"Stars, Sight, and Science": NSF Center for Adaptive Optics /
California State Summer School for Mathematics and Science

 A look at M5’s H-R Diagram (above) shows that is not the neat line as predicted by theory. In fact it is not even a reasonably rough line. The data is not totally random, but it is highly scattered. It is clear that the actual data does not look like the theory.

Cleaned up M5’s H-R Diagram

"Stars, Sight, and Science": NSF Center for Adaptive Optics /
California State Summer School for Mathematics and Science

When Evolutionary Astronomers date a Globular Cluster, they first clean up the image by removing stars of vary uncertain magnitude. In most cases it does not explain the high degree of scattering. Furthermore, the process still leaves a high degree of scattering.

Best fit theoretical curve.

Stars, Sight, and Science": NSF Center for Adaptive Optics /
California State Summer School for Mathematics and Science

Then the best fit is made of a line; predicted by the theory; is made to the data, theoretically there by giving the age of the cluster. However, there is still way too much scattering to be convincing. If it were at least a reasonably descent fit, Evolutionary Astronomers would have a case, but that is not the case.


Conclusion

 When Stellar Evolution Theory is compared to real data the theory is not an objective match to the data. The high degree of scattering suggests the there are problems with the standard model and that at least some stars may not fit the standard model. It also suggests that something other than aging causes observed patterns. Furthermore Stellar Evolution Theory seems to provide no explanation for the scattering. As a result Stellar Evolution Theory can not be said to objectively fit real astronomical data.



 
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