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# 424 Note for ASTR 26300 with Professor Moffett at Purdue

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COURSE
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TYPE
Class Notes
PAGES
6
WORDS
KARMA
25 ?

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This 6 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at Purdue University taught by a professor in Fall. Since its upload, it has received 21 views.

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Date Created: 02/06/15
1 Luminosity brightness and distance the inverse square law Luminosity the amount of energy that a body radiates each second does not depend on distance Brightness amount of energy the observer receives Difference between the two Luminosity ofa fixed source is constant but the brightness changes depending on the distance between the source and point of observance What s the relationship between brightness luminosity and distance Brightness depends on both luminosity and distance More luminous more bright Parallax used to find brightness Brightness is the amount oflight that I would see The luminosity is the brightness that doesn t change with distance They are directly proportional Brightness and distance squared are inversely proportional IfI change one of the quantities how will the others be affected Need to know B 1L 4H d2 How can you calculate the difference between two unknown bulbs Ifyou have a 200W bulb and a 100W bulb the photometer would need to be closer to the 100W bulb to make the sides have equal brightness The 200W is brighter by a factor of 2 so L100W BlOOw lt d 100w2 LZOOW Bzoow lt d 200w2 Know how to solve for diff terms in the brightness equation and how to use the equation when you are comparing two different light sources 2 Stars Light and Spectra Example of important information or properties which can be found using a spectrum In order of decreasing wavelength radio waves microwaves infrared light Visible light ultraviolent light Xrays gamma rays What are the three basic types of spectra Describe each type and provide an example Continuous spectra the intensity changes smoothly with wavelength and all colors are presentVery hot solids liquids and some dense opaque gases emit continuous spectra Example Halogen lamp aka incandescent rainbow of all colors Emission the light is emitted at only a few particular wavelengths producing bright lines while most of the other wavelengths remain dark hot gases aurora and interstellar gas clouds are examples of objects that emit emission spectra Example Florescent lighting aka overhead lighting green and red Absorption nearly all colors ae present but light is either absent or considerably dimmer at some wavelengths producing dark lines This is produced when light from a hot dense body a continuous spectrum passes through cooler gas Absorption spectra are therefore a special case of continuous spectra with some light missing How do filters work What do the filters used in the lab represent in astronomy Filters are used to allow specific light through and blocks others Four filters red green blue and an enhancing filer made from neodymium glass it enhances reds and oranges in color photographythese will have a faint bluish color You estimate the brightness by looking through a spectrometer the color is NOT estimated by the width of the color band that is NOT the brightness Red allows lots of orange yellow Red is brightlittle green blue violet Green allows lots of green Yellow and blue are brightlittle blue barely any red orange or violet Blue allows lots of green and blue Violet is brightlittle red orange yellow The enhancing filter is VERY bright in all colors except yellow These filters represent the Earth s atmosphere and how it blocks high frequency light The upper atmosphere blocks almost all light with a WV shorter than Ultra Violet 300nm The atmosphere is almost totally transparent to visible light What will you see if you combine filters together Each filter absorbs a certain portion What is the range of electromagnetic radiation that the human eye can detect 400nm to 700nm referred to as the visible spectrum What is the rel bt wavelength and frequency How does the energy of a photon relate to the wavelength and frequency Be able to describe what is happening at the atomic level to create an emission spectrum or an absorption spectrum The absorption process is exactly the opposite of the emission process ie the bright lines in an emission spectra are the dark lines in an absorption spectra Know what type of spectrum comes from an object made up of many elements Be familiar with a solar spectrum Know how to solve for different terms in the brightness equation and how to use the equation when you are comparing two different light sources Also know how to compare brightness of the same source when you are at different distances from the source Do the math by yourself to be confident with solving this equation and using the calculator properly 3 Starry Night Introduction De ne drmmpular the constellations that never set at yeur location they are Visible every night ofthe year Hew dues yeur ieeatien an earth effea Circumpular mnstellatiuns it changes every time yeu meve What eensteuatiens are drcumpular tn iafayene Drace Ceptus Cassiepeia Ursa Miner Camelepardahs De ne zenith point directly abovethe ebservers head Hew dues yeur ieeatien an earth affea ynur zenith it changes every time yeu move areund Knuwhuwyuur pesitien an earth affects the relative pu sitien uf Pularis and the eerreiatien ht Fulan s39 height in degrees abuve the hun39zun and yeuriatitude en the nerthem hemisphere Hew dues the rum un ufthe earth affea the 1139 39ng setting and rmatiun ufall eensteuatienssiars The Earth retates about 15 degrees eaeh heur and It causes the constellationsto appearto move aeressthe sky The separation oflatitude means Iftwo locations en earth are separated by 15 degrees then the starswill rise ene hourlaterm the westemrmost location comparedtothe eastemrmost location 4 ConstellationsAsterisms Know hewte find and draw the fellewmg Big Dipperwrsa Major Dubhe Merak Mizar and Alcor Little Dippermrsa Minor Pelans UrsaMmDr Pmaris mzar amp NEW I Mrk Uh Ursa Meier Cassiepeia Schedir 7 Shemr b Casswonewa Bootes Arcturus Lyra Vega Aquila Altair Summertnangle page 250 Aquila AAltalr EqE 7 x 39 39 Dethlnus A Composed of Cepheus What is the definition of a sidereal day Why is it different than a solar day Why did we need to go to the dark site to observe the night sky

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