Lecture 16 - allows us to measure transverse velocity a...

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Lecture 16 – 10/28/10 Infrared telescopes look at gas and dust and space High energy x-ray telescope have random directionality Radio telescopes have long wavelengths and the size of the telescope is really large Really good CCD detectors can give a lot of helpful information a) Wavelengths are spread out along a chip O, B, A, F, G, K, M, M are the letters of the CCD spectrum Doppler effect- motion of source of waves have an effect on the wave a) Waves get close together in direction of motion (blueshift) and farther apart (redshift) away from the motion b) Used to measure speed of things in space c) There’s a difference in wavelengths and sound heard d) Red shift means star is moving away from you and blue shift means star is moving toward you Shift from star left and right allows us to measure radial velocity and perpendicular shift
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Unformatted text preview: allows us to measure transverse velocity a) Doppler effect only allows us to measure radial velocity Space motion- total actual movement from radial and transverse velocity Spectral line broadening a) Rotational Doppler broadening- rotating of lines spreads atoms away and toward you making the line broader i) Faster the rotation the broader the line b) Collision broadening- collisions between atoms c) Thermal Doppler broadening- caused by thermal motions of the gas i) b, d are microscopic events When comparing 3 different spectra, the shaper line has low pressure Observable properties of stars a) Luminosity- distance and brightness b) Effective temperature- color and maximum wavelength or spectral lines c) Radius- L + T + S.B. Law = radius d) Mass- binaries e) Composition- from spectra...
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