A star at a distance of 4 pc has an apparent magnitude of 2. What is its absolute magnitude? Given the fact that the Sun has a luminosity of 3.9 x 1026 W and has an absolute magnitude of about 5, find the luminosity of the star.
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Q: A star has an apparent magnitude of 10 and an absolute magnitude of 2.5. How far is it?
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- Astronomers use two basis properties of stars to classify them. These two properties are luminosity and surface temperature. Luminosity usually refers to the brightness of the star relative to the brightness of our sun. Astronomers will often use a star’s color to measure its temperature. Stars with low temperatures produce a reddish light while stars with high temperatures shine with a brilliant blue—white light. Surface temperatures of stars range from 3000o C to 50,000o C. When these surface temperatures are plotted against luminosity, the stars fall into groups. Using the data similar to what you will plot in this activity, Danish astronomer Ejnar Hertzsprung and United States astronomer Henry Norris Russell independently arrived at similar results in what is now commonly referred to as the HR Diagram. Procedures:1. Read the Background Information 2. On the graph paper provided. Place a number next to the star according to its luminosity and surface temperature listed in the data…Q3.2 The supergiant star has a surface temperature of about 2900 K and emits a power of approximately 4 x 1030 W. Assuming that is a perfect emitter and spherical, find its radius. (hint: Area of the sphere is A = 4πr²)A star has a peak output at 440 nm and has a luminosity of 3 solar luminosities. What is its radius? (LS=3.826 X 1026 J/s)
- Calculate the luminosity of the star with an apparent magnitude of 2. Given the Sun has an apparent magnitude of -26.57 and 3.9 × 1026 W luminosity.A certain star has a temperature twice that of the Sun and a luminosity 64 times greater than the solar value. What is its radius, in solar units?What is the luminosity of a star having four times the radius of the Sun and a surface temperature of 8,000 K?
- Star 1 and star 2 have the same V-magnitude, V = 7.5. However, they have different B-magnitudes, B1 = 7.2 and B2 = 8.5. What are the (B − V) colors of the two stars?A star has a radius of 2RO and has a temperature of 3TO. Calculate the luminosity in solar units.Consider two stars on the main sequence, A and B. Star A has a mass of 4 M⊙. Star B has a mass of 0.8 M⊙. By what factor is the luminosity of star A greater than the luminosity of star B?