ASTR 1345 1st Edition Lecture 16 Outline of Last Lecture I. Bohr’s ModelII. Spectral Analysis III. Spectral TypesA. Absorption linesB. Emission LinesIV. AtomsA. IonizationB. TransitionC. Ground StateD. Excited StateOutline of Current Lecture I. Doppler ShifA. RedshifB. BlueshifII. VelocityA. Radial VelocityB. Transverse VelocityC. Proper MotionIII. IsotopesCurrent Lecturel.The Doppler Shif is the change in wavelength of radiation due to relative motion between the source and the observer along the line of sight. Electromagnetic waves do not need a medium to travel.A. Redshif is the shif to longer wavelengths of light from remote galaxies. This is the Doppler shif of light from any receding source.B. Blueshif is the shif of all spectral features towards shorter wavelengths. This is the Doppler shif of light from an approaching source.ll.These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.The Universe is expanding with a high velocity and galaxies are moving away from each other.A. Radial velocity is the portion of an object’s velocity parallel to the line of sight.B. Transverse velocity is the portion of an object’s velocity perpendicular to our line of sight to it.C. Proper motion is the change in location of a star on the celestial sphere.lll.Isotopes are atoms that all have the same number of protons but different number of neutrons. Their nuclear properties ofen differ greatly. Naturally an atom is neutral, if electrons are charged it’s still the same element just with a different
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