Astronomy Chapter 3 Crossword
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
                                                          
 
 
Down: 1) the actual amount of light emitted by a star into space2) a type of mathematical law in which one quantity is inversely proportional to the square of another quantity4) binary star for which the two stars are too close to each other to be resolved (we can detect that they revolve around each other with a varying Doppler shift in their spectrum)5) A broadened line can yield a lower limit to the star's rate of rotation on its axis7) a measure of how bright a star appears to us (also called visual brightness)9) the smallest particle of a chemical element10) the amount of angular change in a star's position per year11) the difference between the apparent magnitude (m) and the absolute magnitude (M) of a star, from which we can deduce the distance to the star13) a measure of how luminous a star actually is (equal to the apparent magnitude the star would be if it were 10 pc away)14) Temperature sequence beginning with hottest stars (O) and continuing to the coolest (T) stars. OBAFGAKMLT15) Nine principal categories of stars determined by their absorption spectra17) the energy required to remove an electron from an atom19) two stars appearing to be close as seen from Earth, but which are far away and not gravitationally bound20) binary star for which one of the two stars is invisible, but affecting the motion of the other star in a way that can be measured21) a pair of stars that appear close to each other in the sky as seen from Earth22) a star's speed toward or away from us along a line of sight 23) binary star for which one star passes in front of the other25) the analysis of spectra (or spectrums)27) motion of stars through space with respect to the Sun, determined by both radial velocity and proper motion28) all the other energy levels 31) lower left corner of HR diagram, end life cycle of a star32) branch of astronomy that involves measurements of distances and motions of stars Across: 3) a continuous array of all the rainbow colors6) atomic model that describes electrons as orbiting the nucleus in concentric circular orbits. To each orbit corresponds a specific energy for the electron. When an electron jumps to a lower level, it emits energy in the form of light with a value equal to the energy difference between the two levels. 8) a splitting or broadening of spectral lines occurs in the presence of a magnetic field12) roughly 90% of stars on the HR diagram lie here, in a band from the top left to the bottom right16) binary star for which the two stars can be resolved with a telescope18) a pattern of dark lines across a continuous spectrum24) a pattern of bright-colored lines of different wavelengths26) two stars revolving around a common center of gravity, bound by gravity29) half the apparent change in the star's angular position30) Peak wavelength is inversely proportional to its temperature in Kelvin. (The hotter the star, the the shorter the wavelength at which it emits its maximum radiation.)33) A broadened spectral line is produced when atoms collide more frequently in higher-density stars34) the distance to an imaginary star whose parallax is 1 second of arc. About 31 trillion km (19 trillion miles)/3.26 light years35) the lowest energy level available for an electron36) the amount of light at a distance d from a star (depends on the distance)37) the apparent change in a star's position when viewed from opposite sides of the earth orbit38) the different energies an electron is allowed to have
 

 

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