If parallax of a star is 0.22 arc-seconds and its apparent brightness is 50 x 10-6 W/m2 . What is its luminosity? 2.5 x 1030 W 3.2 x 1026 W 1.2 x 1031 W 5.3 x 1034 W
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If parallax of a star is 0.22 arc-seconds and its apparent brightness is 50 x 10-6 W/m2 . What is its luminosity?
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2.5 x 1030 W |
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3.2 x 1026 W |
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1.2 x 1031 W |
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5.3 x 1034 W |
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- Two stars-A and B, of luminosities 0.5 and 4.5 times the observed to have the luminosity of the Sun, respectively-are same apparent brightness. Which star is more distant, and how much farther away is it than the other?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.If a star has a parallax of 0.050 arc second, what is its distance in pc?
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