Details Title: Astro things 3:. Description: N/A Total Flash Cards: 34 Created: 06/17/2009 17:30:35		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Astronomy Flashcards
Cards in this set: Term Kirchhoff's Laws of Radiation Law 1: Continuous Spectrum Definition radiate at all wavelengths and thus produce a continuous spectrum. Term Kirchhoffs Laws of Radiation Law 2: Emission Spectrum Definition a low-density gas excited to emit light will do so at specific wavelengths Term Kirchhoff's Laws of Radiation Law 3: Absorption Spectrum Definition if light with continuous spectrum passes through a cool, low-density gas which absorbs them, it will produce an absorption spectrum. Term The only thing that radiates a continuous spectrum (white light) Definition Blackbody: Term The one thing you need to know about a black body Definition temperature Term Doppler Shift Definition motion of an object causes the wavelength to change; motion toward the observer shifts the color blue, and vice versa for red. Term Temperature sequence classifications for stars Definition OBAFGKM, 0-9, 0 being the hottest and so forth. Term Wien's law Definition 3000000/T= lambda max Term Hertzprung-Russel (H-R) Diagram Definition star's luminosity versus the Temperature/spectral type; stars are found in specific regions of the diagram. 90% of stars fall on the Main Sequence line. Term Giants and Supergiants Definition cool T/high L Term White Dwarfs Definition dying stars, high T/low L Term few electrons make it to n=2 state Definition good to know! Term Metals Definition everything but hydrogen/helium...the others are easier to move electrons, since the outer ones are weakly bound. Term Visual Binary Definition both stars seen in telescope, gravitational pull to each other. Term Spectroscopic Binary Definition Doppler shift, only one star visible; SB1-one set of shifting lines...SB2=two Term Beta Persei Definition Winking Star (demon Star) Term ISM Definition Interstellar Medium; mostly made of hydrogen (75%) and helium (25%) Term Nebulae Definition luminous clouds typically red in color, associated with O or B type stars. Term Dark Clouds Definition Opaque, made mostly of dust grains and complex molecules....also known as Molecular clouds. Term Dark clouds are gravitationally stable when... Definition outward gas pressure= inward gravitational force...they need something to initiate the cloud collapse, such as a shock wave Term Shock Wave Definition supernova explosions, spiral arms in galaxies, collisions between clouds, between galaxies.... Term Protostar Definition the beginning of the forming of a star, as it starts to collapse in on itself. Term Blok Globules Definition small dark clouds in emission nebulae, possible sites of collapsing clouds. Term Solar Nebula Theory Definition As cloud collapses, sun condenses in the middle, with a ring/disk of matter around it, creating planets. Term Terrestrial Planets Definition without H and He, formed in high T region of Solar nebula. Term Jovian Planets Definition low density, large in size, many moons and often ring systems; large atmospheres Term Protostellar Disk Definition star forms in core, disk forms because of angular momentum. Term Proton-Proton Chain Definition converting four H into one He, mass loss. Term Radiative Zone Definition heat transfer dominated by photons (heat from fire/sun Term Convective Zone Definition energy transport dominated by gas motion (boiling pot of water) Term Conduction Definition energy transport by contact (heat transferred along a metal spoon) Term Photosphere Definition region where photons escape the sun; Granules=convection cells, about the size of Texas. Term Angstrom (A) Definition typical size of an atom; optical light= 4000A-7000A Term Cecilia Payne-Gaposhkin Definition found temperature sequence in Anni Jump Cannon's spectral classification.