5 Written questions
5 Matching questions
- Closest Star
- Apparent Brightness
- Light Year
- Stellar Evolution
- Magnitude System
- a The amount of light reahing us (per unit area); measured in flux.
- b The distance light travels in one year = approximately 10 trillion kilometers.
- c A star's life path as shown on a Hertzsprung-Russell Diagram.
- d The Sun
- e Originated by Hipparchus. A scale to show how bright the stars appear to our eyes (or binoculars and telescopes)
5 Multiple choice questions
- Very, very hot stars which are small in size.
- One of the two major classes of variables. There are five classes. One important example: Cepheid Variables.
- Cool stars which are a little smaller and dimmer than the supergiants.
- Everything is moving. Overcome by making more than two measurements, take all motions in account, now calculate parallax then distance.
- The apparent shift of an object relative to some distant background as the observer's point of view changes. Allows you to determine close stellar distances. Only works with fairly close stars
5 True/False questions
Proxima Centauri → 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.
Spectral Type → Stars color/surface temperature E - this is how we classify stars.
Stellar Mass → The most important stellar property. Measured by an adaptation of Kepler's 3rd Law as derived by Sir Isaac Newton. Kepler's 3rd law you measure the period and average distance of the object's orbit. You need two objects. Over 50% of stars have a companion star.
Cepheid Variables → One of the two major classes of variables. There are five classes. One important example: Cepheid Variables.
Parsec → 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.