5 Written Questions
5 Matching Questions
- Apparent Brightness
- Star's temperature
- a Oh Be A Fine Guy Kiss Me Right Now Sweetheart.
- b The distance to an object with a parallax angle of 1 arcsecond; unit is pc. One pc = 3.26 light years (ly) = 3.09 x 10^13 km.
- c Measured at a star's photosphere. The photosphere temperature dictates its color. Hotter stars are whiter. Cooler stars are redder. Our Sun is a yellow star.
- d The amount of light reahing us (per unit area); measured in flux.
- e Cool stars which are very large and very bright.
5 Multiple Choice Questions
- Referred to as the H-R Diagram. Plots two stellar properties. The star's temperature (spectral class) and the star's Luminosity - measured either by solar units (against our Sun) or Absolute Magnitude.
- Next closest star after the Sun. Part of the three-star Alpha Centauri system. 4.3 light years away. (50 mile high stack of toilet paper stretched out 1 sheet = 1 million miles scale. Parallax angle of 0.77 arcsecond. From the Sun, 1.3 pc or 4.3 ly away or 3.98 x 10^13 km (2.43 x 10^13 miles). Largest Parallax angle we see.
- Everything is moving. Overcome by making more than two measurements, take all motions in account, now calculate parallax then distance.
- Spectral type F (pale yellow) Temperature range: 6,000-7,500 K.
- What we see in the sky. Star Charts and planispheres use different size "dots" to represent.
5 True/False Questions
Spectral type K → Red - Temperature range <3,500 K.
Open Cluster → Spectral type M (red) Temperature range <3,500 K.
Spectral type F → Orange - Temperature range: 3,500 - 5,000 K.
Optical Double → Stars not physically related to each other but happen to line up so that we see what appears to be a double star system. More rare than one would think.
Spectral Type → Pale Yellow - Temperature range: 6,000-7,500