You have access to a small professional telescope that is able to record the ultraviolet through infrared spectrum of a star in the constellation of Orion. You determine that the wavelength of light at the peak of the spectrum is 922.93 nm. The star's apparent magnitude is m = 0.45.

a) [2 marks] Determine the star's surface temperature in units of Kelvin (K). b) [3 marks] Using the solar constant and the Sun's apparent magnitude, determine the

star's brightness in units of Watts per square metre (W/m2). c) [2 marks] Using the star's parallax (we'll talk about this a little later in the course),

you determine that its distance is 643 light years. Calculate the star's luminosity in

units of Watts (W). d) [2 marks] Determine the star's radius in metres, and compare it with the size of the

Sun.

Answer rating: 100% (QA)

a To determine the stars surface temperature in Kelvin we can use Wiens Law The formula is as follow... View the full answer