Brightness- Application Complete the tasks correctly on first attempt Suboptimal

Question

Brightness- Application Complete the tasks correctly on first attempt Suboptimal performance will be rewarded with -2 points per unsuccessful attempt Dargo Aeryn Calc?late the properties of Dargo Distanceparsecs Luminosity Parallax: 0.0023 App. Mag.: 9458 Parallax,0.0385* Distance: 26 parsecS App. Mag: 8.243 Calculate the luminosities of the other stars, Crichton Parallax: 0.0455 App. Mag.: 1.364 Aeryn . CrichtonL .Distance: 22 parsecs Which star is the brightest? Which star is the most luminous?

Explanation / Answer

w1. The distance of star Drago = 1/0.0023 = 431.78 par secs

To find luminosity first of all we have to measure the absolute magnitude of the star. We use this distance, along with the apparent magnitude, m = 9.458 in the equation,
M ? m = 5 ? 5 log d

M= m+5-5log d

M = 9.458+5-5log 431.78

M = 1.282

The star is more luminous than Sun, because M sun= 4.83

2. Aeryn distance = 26 par secs

M = 8.243+5-5log 26 = 6.17

The star is less luminous than Sun.

3. Crichton = M= 1.364+5-5log 22 = -0.35

The star is more luminous than Sun.

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