Chapter 30.1: Characteristics of Stars - PowerPoint PPT Presentation

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Chapter 30.1: Characteristics of Stars

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  1. Chapter 30.1: Characteristics of Stars

  2. Characteristics of Stars • A star is a _________________________ ___________________________________. • Size varies • Color varies__________________. • Our sun is an average star

  3. Composition • Star composition observed through a spectrometer • Separates light _________________________. • Each color represents a different wavelength • Three types of spectra - - - • Since different elements absorb different wavelengths of light , elements can be determined.

  4. Composition Continued • __________is the most common element. • Surface temperature of a star is indicated by the color • _________are the coolest and _______ are the hottest (Figure 2 on page 776).

  5. Motion • Two kinds of motion associated with stars: • ____________--- just like it sounds! • ____________--- This is motions visible to the unaided eye in a dark sky; due to movement of Earth.

  6. Motion Continued • Some stars create circular trails around a central star (Polaris aka the North Star) - • Different stars become visible during different seasons. • Three actual motions: 1. 2. 3.

  7. Distance • Distance • Light Year = 9.5x1012km; Distance that light travels in one year. • Astronomical Unit (AU) _________ _____________________________ ________________.

  8. Stellar Magnitude • Magnitude:______________________________________________________________. • Apparent magnitude = brightness of a star as it appears to us on Earth • Measure light from star using telescopes • Measurement is then assigned a number Brightest stars have lowest numbers • Dimmest stars have highest numbers • Absolute:___________________________.