evolutionary track A graphical representation of a star's life as a path on the Hertzsprung&151;Russell diagram.
Evolutionary Track - The path in an H-R diagram followed by the point representing the changing luminosity and temperature of a star as it evolves ...
[edit] Evolutionary tracks
See also: Stellar evolution
This shows the Hertzsprung-Russell diagrams for two open clusters. NGC 188 (blue) is older, and shows a lower turn off from the main sequence than that seen in M67 (yellow).
Evolutionary track of a Sun-like star from main sequence to asymptotic giant branch.
Image credit: NOAO
A region of the Hertzsprung-Russell diagram that lies above and roughly parallel (hence the name "asymptotic") with the red giant region.
evolutionary track
The path a star follows in the H-R diagramm as it gradually changes its surface temperature and luminosity.
extrasolar planet ...
evolutionary tracks on H-R diagram
Zero Age Main Sequence (ZAMS)
location on MS mass dependent (O high, M low)
formation time mass dependent (O short, M long) ...
Evolutionary Tracks
Evolution of High-Mass Stars Post-Main Sequence
Evolution of Low-Mass Stars Post-Main Sequence
One-Solar Post-Main Sequence Evolution.
EVOLUTIONARY TRACK
An Evolutionary Track is the change in location of a star on the Hertzsprung - Russell (H-R) Diagram. As a star ages and evolves, you can trace out its history on the H-R diagram.
That is, the change in the evolutionary tracks due to the abundance of heavy elements.
One does not "connect the dots" in such plots to obtain evolutionary star tracks, although such a bunch of stars may indicate sections of evolutionary tracks.
A plot of luminosity against temperature, showing the location of some well known stars and the future evolutionary track of the Sun. Both scales are logarithmic. Our Sun, like most of the stars we see in the sky, is converting hydrogen into helium.
red-giant branch The section of the evolutionary track of a star that corresponds to continued heating from rapid hydrogen shell burning, which drives a steady expansion and cooling of the outer envelope of the star.
These densities, giving number of stars along the main sequence and implying the rate of evolution for stars beyond it, are combined with theoretical evolutionary tracks for stars of various mass and initial metallicity.
The few stars that populate this gap are RR Lyrae and other variable stars. It is regarded as a region through which a star moves rapidly in its evolutionary track away from the main sequence. [H76]
Hertzsprung-Russell Diagram ...
about A0 to F5) in the horizontal branch of the H-R diagram (see instability strip). The few stars that populate this gap are RR Lyrae and other variable stars. It is regarded as a region through which a star moves rapidly in its evolutionary track ...
The most massive star known is Melnick 42 in the . It appears to have a mass of 80- and a luminosity of , where is the solar luminosity, equal to J s-1. The evolutionary tracks followed by stars of various masses are summarized as follows.
The H-R diagram and the Main Sequence Phase
We could represent the process of formation of a star in the H-R diagram by an evolutionary track. And we will see that the mass is the most important factor that determines the fate of a star.
 See also: Energy, Star, Time, Temperature, Mass
|
