Luminosity temperature diagram Luminosity. For example, if a star has the same surface temperature as the sun and a radius that is twice as big, its luminosity must be L = (2 R)2(T)4 = 4L. One can experiment with the relationships

between luminosity, temperature (spectral type), and radius with the Stellar Luminosity Calculator. Use the calculator to answer the following questions. Spectral type is related to surface temperature, with stars of spectral type O having the highest surface temperature and stars of spectral type M having the lowest surface temperature. In other words, spectral type increases to the left on the H-R diagram. Now proceed to Part E to determine how these stars compare in luminosity. Spectral type is related to surface temperature, with stars of spectral type O having the highest surface temperature and stars of spectral type M having the lowest surface temperature. In other words, spectral

type increases to the left on the H-R diagram. Author: Anup Patwardhan The higher temperature star is the more luminous, if they both have the same size. Part II: Application to the H-R Diagram. Every question can be answered by considering that L = T 4 × surface area × constant. Stars s and t have the same surface temperature. Star s is more luminous. Therefore, star s is larger in size. Luminosity increases with size for objects of the same temperature. diagram Main sequence is when a star is burning hydrogen in its core. The luminosity and temperature of a main-sequence star are set by its mass. More massive means brighter and hotter. The basic H-R diagram is a temperature vs. luminosity graph. The temperature may be replaced or supplemented with spectral class (or color index as noted earlier). The main spectral classes in order from hottest to coolest

are O, B, A, F, G, K, and M. The H-R Diagram- Stellar Luminosity and Temperature Introduction: Astronomers use two basic properties of stars to classify them. These two properties are luminosity, or brightness, and surface temperature. Astronomers will often use a star’s color to measure

it’s temperature. Stars with low temperature The Hertzsprung–Russell diagram, abbreviated as H–R diagram, HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.More simply, it plots each star on a graph plotting the star's brightness against its temperature (color). 26 Watt and its temperature is approximately 6,000 K. To calculate its radius, we use EQ #2: 8 m R = 0.93 R⊙ ≈ 1 R⊙ . D. Calculating the Radii of the Stars Using the HR Diagram in

Figure 1, estimate the luminosity and temperature of all the stars listed in Table 1 and record their values in Table 1.

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