lab 5

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San Jacinto Community College *

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Course

1301

Subject

Astronomy

Date

Dec 6, 2023

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pdf

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7

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HR Diagram 5-1 Lab 5 HR D IAGRAM Part I: Exploring the HR Diagram 1. Check the appropriate region of the HR diagram corresponding to each description below. 2. Check the appropriate region of the HR diagram corresponding to each description below. 3. What is the general relationship between luminosity and temperature for stars that lie along the main sequence? Description Top Right Bottom Left Hot stars are found at the: x x Faint stars are found at the: x x Luminous stars are found at the: x Cool stars are found at the: x Description Upper Left Upper Right Lower Right Lower Left Large Blue stars are found at the: x Small Red stars are found at the: x Small Blue stars would be found at the: x Really Large Red stars are found at the: x
HR Diagram 5-2 Part II: Luminosity-Radius-Temperature Relation 4. The equation below describes the luminosity of a star in terms of its radius and temperature. Use this equation to explain the results you found in the table of the previous question. The size and temperature effect the luminosity of the star exponentially and that the temperature has a greater effect on the luminosity over the size 5. Typing the values directly into the boxes in the Cursor Properties, determine the radius of a star that has a surface temperature of 3000K and a luminosity equal to the Sun (1 L ). 3.7 6. Now determine the radius of a star that has the same surface temperature (3000K) but a luminosity of 100 L . Based on the equation above, explain why this makes sense. I think it should be 37 because the luminosity increases the their radius must increase
HR Diagram 5-3 7. Now determine the radius of a star that has the same luminosity as the Sun (1 L ) but a surface temperature of 30,000K. Based on the equation above, explain why this makes sense. It should be .037 because the temperature is high so the luminosity is low, the radius should be small 8. Use the results from the previous questions to construct a “conceptual” HR Diagram. You simply want to draw arrows showing the direction in which variables are increasing. a) Draw in an arrow on the y-axis showing the direction of increasing “intrinsic luminosity” of the stars. (This is complete for you.) b) Draw in an arrow on the x-axis showing the direction of increasing surface temperature of the stars. c) Draw in an arrow showing the direction of increasing radius on the diagram. (Hint: this must be perpendicular to the isoradius lines.) L
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