Question

**Question 1:**

a: The measured parallax angle for the star Antares as observed
during Earth’s orbit

is 0.008”. Here, I’m using the definition that this angle is half
of its total apparent

movement on the sky. Given this angle, calculate the distance to
Antares.

b: The angular diameter of Antares has been resolved in one study,
and given as 41

milliarcseconds. Using your answer to part a above, calculate its
linear diameter. How

does this compare to the Sun’s?

c: Antares has an apparent magnitude in the V band of 0.96.
Calculate its absolute

magnitude.

d: Given your answer to part c, what is its effective
temperature?

(note: Using the values in this problem, your answer will seem
incorrect, because of a

simplifying assumption that I am not asking you to correct for in
the problem)

e: Based on the properties listed above, can you give a qualitative
description of this

particular star? That is, overall how is it similar or different
from the Sun?

Answer #1

Parallax angle for a star is 195 mas. Its surface temperature is
7500 K and diameter of 4 times solar radius. Calculate apparent
magnitude , absolute magnitude, luminosity, wavelength of peak
emission and flux received on surface of the earth.

1/ Alpha Centauri A is a star that is remarkably like
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Alpha Centauri A lies at a distence of 4.4 light-years from Earth,
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Calculate the apparent brightness of Alpha Centauri
A
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