1. Chapter 29 Station work- What you should know!

2. Star Life Cycle-Station 1 Depends on mass – Smaller, cooler stars last longest – High mass stars burn through their mass much more quickly= short life

3. Tools of Astronomy-Station 2 Spectroscopy=science of the properties of light Based on EM radiation Inverse relationship between frequency and wavelength Used to figure out temp and composition of stars (station 3) telescopes

4. Spectral Analysis-Station 3 Lines=“fingerprints”; Unique banding for each element Element (chemical composition)=temperature Lines Rotational rate (thicker lines=faster) Relative motion (doppler, Red=away)

5. Sun and Stars-Station 4 Sun is…. – an average star – a “nuclear power plant”=hydrogen into helium Composed of a – Core=plasma (too hot bc of pressure from layers above) – Radiative zone-cooler than core – Convention zone-magnetism – Photosphere-visible (sunspots) – Chromosphere-absorption/emission spectra (prominences) – Corona- solar wind – Sun spots-11 year cycle, high to low

6. Station 4 cont. Binary-two stars bound together by gravity Doppler – blue=closer – red=away Parallax-apparent shift in position caused by motion of the observer (throughout orbit) – Closer=larger shift – “left eye, right eye”

7. Our Community’s Place Among Stars- Lamp Lab-station 5 Observations may vary. Your data should show that: ”Brightness decreases with distance”, SPECIFICALLY the square of the distance”-INVERSE relationship. EX: A star twice as far from Earth would appear as ¼ as bright as a closer, identical star. Last two questions: – Both the distance to a star AND its absolute (1 AU) brightness affect the brightness we observe (apparent magnitude) from Earth. DistanceBrightness 01 11/2 21/4

8. HR Diagram Activity-Station 6 O, B, A, F, G, K, M (across top) Based on temperature and luminosity – Temperature (x axis): chemical makeup example= hottest stars (O, B) are composed of ionized helium, nitrogen, and silicon = cooler stars (F, G) allow more metals to form in their atmospheres along with ionized calcium, iron and chromium -Luminosity (y axis): intrinsic brightness (based on temperature) -measure of the total radiative output of an object

9. Station 7-Magic School Bus Hope you enjoyed!