Chapter 11.The Sun, Our Star

Chapter 11.The Sun, Our Star - The Sun, Our Star Chapter 11...

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1 The Sun, Our Star Chapter 11
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2 Our Star, the Sun
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3 Why study the Sun? It’s the closest star to us, and the star we can study in greatest detail. In astronomy, for convenience, we compare the properties of other stars to the Sun. We use the symbol I to refer to the Sun. 20M I means a star twenty times the mass of the Sun and 0.1L I would mean a star one-tenth the luminosity of the Sun. The Sun has a profound effect on our climate, and life on Earth How many of our energy sources are connected with the Sun?
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4 The Sun is the Largest Object in the Solar System The Sun contains more than 99.85% of the total mass of the solar system If you put all the planets in the solar system, they would not fill up the volume of the Sun 110 Earths or 10 Jupiters fit across the diameter of the Sun How big is the Sun?
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5
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6 The Sun - G2 V • Mass = 330,000 M E = 2 x 10 30 kg • Radius = 109 R E = 6.96 x 10 5 km Density = 1.4 gm/cm 3 Temperature (surface) = 5800 K Temperature (center) = 15 X 10 6 K Luminosity = 3.83 X 10 26 watts
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7 The Sun’s interior has three layers: (1) core (T = 15 million K!) (2) radiative zone
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This note was uploaded on 04/17/2008 for the course ASTRO 1504 taught by Professor Tabak during the Spring '08 term at Youngstown State University.

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Chapter 11.The Sun, Our Star - The Sun, Our Star Chapter 11...

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