Astronomy Chapter 3 Crossword
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
                                                         
 
 
Down: 1) the actual amount of light emitted by a star into space2) a measure of how bright a star appears to us (also called visual brightness)3) a pattern of dark lines across a continuous spectrum5) A broadened line can yield a lower limit to the star's rate of rotation on its axis6) half the apparent change in the star's angular position7) branch of astronomy that involves measurements of distances and motions of stars8) 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)11) a pair of stars that appear close to each other in the sky as seen from Earth12) the amount of angular change in a star's position per year13) motion of stars through space with respect to the Sun, determined by both radial velocity and proper motion15) the energy required to remove an electron from an atom16) a star's speed toward or away from us along a line of sight 18) the difference between the apparent magnitude (m) and the absolute magnitude (M) of a star, from which we can deduce the distance to the star19) roughly 90% of stars on the HR diagram lie here, in a band from the top left to the bottom right20) Temperature sequence beginning with hottest stars (O) and continuing to the coolest (T) stars. OBAFGAKMLT21) all the other energy levels 23) 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. 26) the apparent change in a star's position when viewed from opposite sides of the earth orbit28) a splitting or broadening of spectral lines occurs in the presence of a magnetic field30) the amount of light at a distance d from a star (depends on the distance) Across: 4) a type of mathematical law in which one quantity is inversely proportional to the square of another quantity9) the distance to an imaginary star whose parallax is 1 second of arc. About 31 trillion km (19 trillion miles)/3.26 light years10) 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 measured13) the analysis of spectra (or spectrums)14) a continuous array of all the rainbow colors17) A broadened spectral line is produced when atoms collide more frequently in higher-density stars22) the smallest particle of a chemical element24) lower left corner of HR diagram, end life cycle of a star25) two stars revolving around a common center of gravity, bound by gravity27) two stars appearing to be close as seen from Earth, but which are far away and not gravitationally bound29) a measure of how luminous a star actually is (equal to the apparent magnitude the star would be if it were 10 pc away)31) the different energies an electron is allowed to have32) 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) binary star for which one star passes in front of the other34) binary star for which the two stars can be resolved with a telescope35) a pattern of bright-colored lines of different wavelengths36) the lowest energy level available for an electron37) Nine principal categories of stars determined by their absorption spectra
 

 

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