AST 1002: Study Guide Figure 13b.

AST 1002: "Study Guide" Figure 13b

[Sections Taught by Prof. H.L. Cohen]
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Last updated January 15, 2003

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Fig. 9b Fig. 13b Fig. 23 Fig. 24 Fig. 25 Fig.26a Fig.26b Fig. 27 Fig. 28 Fig. 29 Fig. 30

Figure 13b. HR Diagram and Stellar Radii

(See questions after figure)

Some Questions to Answer Regarding the HR Diagram:

What types of stars (main sequence, giants, etc.) are most numerous?
What is a line of constant temperature (T)?
What is a line of constant luminosity (L)?
What is a line of constant radius (R)?
Is the main sequence a line of constant radius?
If not, is the slope of the main sequence greater or smaller than a line of constant radius?
How does R change if move up a line of constant temperature?
How does R change if move to right along a line of constant luminosity?
How do the numbers of stars, R, T, L, mass and mean density change if move up the main sequence?
How does the mean density change if move up a line of constant temperature?
Where in the HR Diagram are the smallest radii stars? The largest?
What is the approximate range of masses for most stars?
Where in the HR Diagram are the most massive (and least massive) main sequence stars?
In principle, how does one find R from LRT relation?

Be sure to see the topic outlines for Topic F and Topic G for additional items to know.

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