Which diagram shows the relationship between star surface temperature and luminosity?

Which diagram shows the relationship between star surface temperature and luminosity?

• A. The Color-Magnitude Diagram
• B. The Luminosity-Temperature Diagram
• C. The Temperature-Luminosity Chart
• D. The H-R diagram

Answer: (D)

Understanding how a star's surface temperature relates to how bright it is is shown most clearly on the Hertzsprung-Russell diagram. Temperature tells you a star’s color and spectral type, while luminosity is the total energy output, which depends on both temperature and size (radius). In the H-R diagram, luminosity is plotted on the vertical axis and surface temperature (often shown as color or spectral type) on the horizontal axis, with temperature decreasing from left to right. This layout reveals the main sequence where hotter stars tend to be more luminous, but also shows giants and white dwarfs as separate branches, illustrating that stars with the same temperature can have very different luminosities because of their different sizes. The diagram is the standard tool for connecting a star’s temperature to its brightness and for understanding stellar evolution. Other charts that plot brightness against temperature exist, but the canonical name for this relationship is the Hertzsprung-Russell diagram.

Understanding how a star's surface temperature relates to how bright it is is shown most clearly on the Hertzsprung-Russell diagram. Temperature tells you a star’s color and spectral type, while luminosity is the total energy output, which depends on both temperature and size (radius). In the H-R diagram, luminosity is plotted on the vertical axis and surface temperature (often shown as color or spectral type) on the horizontal axis, with temperature decreasing from left to right. This layout reveals the main sequence where hotter stars tend to be more luminous, but also shows giants and white dwarfs as separate branches, illustrating that stars with the same temperature can have very different luminosities because of their different sizes. The diagram is the standard tool for connecting a star’s temperature to its brightness and for understanding stellar evolution. Other charts that plot brightness against temperature exist, but the canonical name for this relationship is the Hertzsprung-Russell diagram.