Chapter 29 Station work- What you should know!. Star Life Cycle-Station 1 Depends on mass – Smaller, cooler stars last longest – High mass stars burn.

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Presentation transcript:

Chapter 29 Station work- What you should know!

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

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

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)

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

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”

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

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

Station 7-Magic School Bus Hope you enjoyed!

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