Lab 6 - Mike Jacobs

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Collin County Community College District *

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1403

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Astronomy

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Oct 30, 2023

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pdf

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NAAP – HR Diagram Explorer 1/8 Lab 6: HR Diagram Worksheet Name: _________________________________________________________ CWID: _________________________________________________________ Background Information Work through the background sections on Spectral Classification, Luminosity, and the Hertzsprung-Russell Diagram within the HR Diagram NAAP lab. Enter your answers to each question in the data tables and indicated spaces below. Question 1 : The table below summarizes the relationship between spectral type, temperature, and color for stars. Fill in the missing blanks in the table. Note that the surface temperature of the stars in the table increases. Star Surface Temperature (K) Spectral Type Color Betelgeuse M2 Arcturus 4,300 G2 Yellow Procyon A F5 Yellow-White Sirius A A1 White Rigel A 11,000 Delta Orionis O9

NAAP – HR Diagram Explorer 2/8 Question 2: Complete the following table related to stellar luminosities in solar units using the equation L = R 2 · T 4 Radius (R ⊙ ) Temperature (T ⊙ ) Luminosity (L ⊙ ) 1 1 1 2 1 9 1 1/2 Question 3: The mass luminosity relation L = M 3.5 describes the mathematical relationship between luminosity and mass for main sequence stars. Use this relationship to complete the following statements: A star with a mass of 2 M ⊙ would have a luminosity of ________________ L ⊙ A star with luminosity of 3,160 L ⊙ would have a mass of ______________ M ⊙ .

NAAP – HR Diagram Explorer 3/8 HR Diagram Explorer Open the HR Diagram Explorer. Begin by familiarizing yourself with the capabilities of the Hertzsprung-Russell Diagram Explorer through experimentation. • An actual HR Diagram is provided in the upper right panel with an active location indicated by a red x. This active location can be dragged around the diagram. The options panel allows you to control the variables plotted on the x-axis: (temperature, B- V, or spectral type) and those plotted on the y-axis (luminosity or absolute magnitude). One can also show the main sequence, luminosity classes, isoradius lines, or the instability strip. The Plotted Stars panel allows you to add various groups of stars to the diagram. • The Cursor Properties panel has sliders for the temperature and luminosity of the active location on the HR Diagram. These can control the values of the active location or move in response to the active location begin dragged. The temperature and luminosity (in solar units) are used to solve for the radius of a star at the active location. • The Size Comparison panel in the upper left illustrates the star corresponding to the active location on the HR Diagram. Note that the size of the sun remains constant.

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