difference in apparent position of an object when viewed from 2 perspectives

Difference in apparent position of an object when

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difference in apparent position of an object when viewed from 2 perspectives, closer objects have larger parallaxArcsecond:used to measure angular distance from equator -- 1/3600th of a degreeLuminosity:total amount of energy released by a nstar galaxy or other astro object-- related to brightness & mass (2x mass = factor of 10 bright)Apparent Brightness:appears to the eye Intrinsic:total light emitted by a starIf distance between 2 objects doubles, apparent brightness drops by 2 (⅓→ 1/9)
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Binary Stars:stars that orbit around each other Keplar’s 3rd [P2=A3/(M1+M2)](p=years, a=AU)Center of mass:of distribution of mass in space is a unique point where if a force acts on the object it will move but not rorateSpectral Class:gives stars ionization state. Gives photospheres temp and densityKelvin:unit of measure of temperature that is absolute. 1K = -459.67 FThermal Radiation:electromagnetic radiation generated by the thermal motion of charged particlesBlack Body: a body that absorbs all electromagnetic radiation. Major emitter at all energy levelsRed Supergiants:largest stars by volume but not by mass. High luminosity class I. Spectral K or M Red Giants:yellow-orange to red. K or M. Class S stars and most carbon stars. White Dwarf:compact star that is no longer generating energy through nuclear fusionHRD: scatter plot of stars showing relationship between luminosity and spectral typesNeutrino:small electrivally neutral particle formed in sun during fusion, associated with dark matterFusion: two fast moving nuclei collide & form one nucleus. 4 H → 1 He Fission:nucleas splits forming two smallerMolecular Cloud Nebulae: interstellar cloud of dust, H, He, and other ionized gasHydrostatic Equilibrium:external gravitation pressure is balanced by electron degerneracy pressurepushing outward-- stops core collapseElectrons at high densites move really fast, creating outward pressureBrown Dwarfs: substellar objects not massive enough to sustain hydrogen fusion Red Dwarf: small relatively cool Main Sequence star (common)Protoplanetary disk: rotating disk of dense gas surrounding a new, herbig, or T Tauri Found near molecular clouds, strong chromosphere lineProtoplanetary outflow: two continuous outflows of gas from the poles of a starSphagettification: stretching of objects into long thin shapes, near black holes, nothing can withstandGravitational Redshifting: electromagnetic radiation reduced in frequency, weaker gravity fieldSpectrum: interrupted by 600 some dark lines (colors missing from sunligh earth recieves)Continuous:complete rainbow of colors [hot opaque bodies, such as a dense gas/solid.. The Sun’s photosphere]Absorption: dark lines among colors of continuous spectrum [transparent gas in front of a continuous spectrum]Emission:bright lines against a dark background [hot transparent gases]Elements in Earth’s atmosphere create more absorption lines because it is coolerSpectral Sequence for Classifying Stars:OBAFGKM (O= hottest blue/white K=coolest orange/red) Wavelength of spectrum lines does not change with Temp (M stars = most common main sequence). Diff luminosity but same spectral class = same temperature. Wavelength
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