Chapter 11-12 (The Stars)

Chapter 11-12 (The Stars) - The Stars The Properties of...

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The Stars
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The Properties of Stars Luminosity- Another word for Brightness Temperature Mass
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Brightness Apparent brightness Absolute brightness – Luminosity Inverse square law
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Stellar Mass To directly determine mass, we need an orbiting object! Binary Star Systems Visual Binary Eclipsing Binary Spectroscopic Binary
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Temperature Color – continuous spectrum – where is the peak of the emitted radiation? Spectral lines – stars of different temperatures contain different elements, molecules, etc.
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Temperature Wien’s Law: The hotter the object, the bluer the radiation it emits, and the more total energy is emitted.
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Temperature The level of heat determines what sorts elements will be prominent in the star’s spectrum For example only the hottest stars can ionize helium Only the coolest stars can have molecules
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Spectral Type Classification System O B A F G K M Oh Be A Fine Girl/Guy, Kiss Me! 50,000 K 3,000 K Temperature (L)
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Stellar Evolution Stars are like people in that they are born, grow up, mature, and die. A star’s mass determines what life path it will take. We will divide all stars into three groups: – Low Mass (0.08 M h < M < 2 M h ) – Intermediate Mass (2 M h < M < 8 M h ) – High Mass (M > 8 M h )
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Stellar Evolution The life of any star can be described as a battle between two forces: Gravity vs. Pressure Gravity always wants to collapse the star. Pressure holds up the star. the type of star is defined by what provides the pressure
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The Birth of Stars Stars are born deep in molecular clouds . cold (10 – 30 K) dense nebulae
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Chapter 11-12 (The Stars) - The Stars The Properties of...

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