In an H-R Diagram, the path showing changes in a star's luminosity and surface temperature as a function of time is called its?
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In an H-R Diagram (Hertzsprung-Russell Diagram), the path showing changes in a star's luminosity and surface temperature as a function of time is called its evolutionary track.
To understand why this is the case, let's break down the components of the question:
1. H-R Diagram: The Hertzsprung-Russell Diagram is a graphical representation of stellar characteristics, which displays the relationship between a star's luminosity (brightness) and surface temperature. Stars are plotted on this diagram based on their intrinsic properties.
2. Luminosity: Luminosity refers to the total amount of energy radiated by a star per unit of time. It is often expressed in terms of the Sun's luminosity, where the Sun's luminosity is considered as a standard unit.
3. Surface temperature: Surface temperature represents the temperature of a star's outer layer, which is usually measured in Kelvin (K) or degrees Celsius (°C). The surface temperature of a star is a crucial factor that determines its spectral class and overall properties.
4. Evolutionary track: The evolutionary track on an H-R Diagram shows the path or trajectory that a star follows as it evolves over time. It illustrates how a star's luminosity and surface temperature change during different stages of its life cycle.
By studying the evolutionary track, scientists can understand various phases in a star's life, such as its birth, main-sequence phase, red giant phase, and possibly its eventual fate as a white dwarf, neutron star, or black hole.
So, to sum it up, the path showing changes in a star's luminosity and surface temperature as a function of time on an H-R Diagram is called its evolutionary track.