Week 5 Telescopes
Week 5 Telescopes AST 111
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This 4 page Class Notes was uploaded by Ashley Childers on Friday September 18, 2015. The Class Notes belongs to AST 111 at University of Southern Mississippi taught by Christopher Sirola in Summer 2015. Since its upload, it has received 29 views. For similar materials see General Astronomy in Physics 2 at University of Southern Mississippi.
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Date Created: 09/18/15
Telescopes REASONS ASTRONOMERS USE TELESCOPES 0 To make objects appear brighter gather light 0 To make objects clearer to improve resolution oTo make objects appear larger to magnify Basic types of telescopes o Refractors Use refraction via lenses First made by Galileo o Re ectors Use re ection via mirrors First made by Newton Refractors 0 Light from a distance object is focused by two lenses to an observer gt 7 i gt 9V4 gt gt gt tub Primary lens e Eye39 piece Refractors Advantages o Simplicity ofdesign 0 Cost Disadvantages 0 Limited in size 0 Inherent blurriness aberrations The worlds larges refractor in the would is at Yerkes Observatory in Wisconsin primary lens is 40inches 1meter across Modern telescopes are housed inside rotating domes a large slit in the dome opens to allow light inside Re ectors Advantages 0 Can be very large 0 Free of most aberrations Disadvantages 0 Secondary mirror blocks some light o Expensive u gt Q VA gt Primar Seconda y W Light re ects off the surface of a mirror Imperfections inside the mirror are irrelevant Mirrors can be supported from underneath as well as their side Therefore mirrors can be very large Telescopes are placed on mounts in order to keep them stable and allow them to track the sky 0 O O O Simplest are called altasimuth mounts They allow the telescope to swivel in vertical altitude or elevation Disadvantages the sky moves horizontal the mount does not Best Equatorial mount arrange athemselves along right ascension and declination allows them to smoothly track objects across the sky Constellations Perseus amp Pegasus Perseus is high in the northeastern sky in early evening during the fall 0 Holds sword in the right hand and a shield in his left with Medusa s head in a bag on his shoulder Pegasus will be near zenith in early evenings during fall 0 0 Easy to nd using great square Upside down 0 Only half of Pegasus his head and lower right Story 0 King Acrisius of Argos is told by an oracle that he will be killed y his grandson So he locks his only daughter Danae in a tower but Zeus king of the gods nds her anyway After Darne gives birth to Perseus king Acrisius locks them in a chest and throws them into the sea Acrisius is hoping to confound the prophecy They are picked out of the sea by a sherman They live on the island of Seriphos and Perseus grows up unaware of his heritage When Perseus is a teen his mother is noticed by King Polydectes He wants Danae as his queen but she is uninterested Polydectes offers to leave her alone if Perseus can slay the Medusa Polydectes secretly hopes he will die Zeus sends Athena goddess of wisdomstrategy to help She gives him a sword shield and a bag plus some good advice To gaze at Medusa will turn one to stone Once beautiful Medusa insulted Athena so she turned her to a monster with snakes for hair A direct look would kill yet a re ection would not Perseus uses his shield as a mirror swings backwards and cuts off her head The winged horse Pegasus springs up fullygrown out of Medusa s body Persus put Medusa s head in his bag climbs on Pegasus and heads home Yet he encounters and important detail Science 0 Algol Beta Persei is in the constellation of Perseus Actually a three star system where two orbit close and the other is far away Beta Per A is a blue main sequence star the other main is an orange supergiant o In 1881 Edward Charles Pickering argues that system variability came with mutal eclipses con rmed by doplar shifts o The stars orbit each other every two days and 21 hours with the main eclipse lasting about ten hours Gas form Algol B is being pulled into Algol A so B is losing mass while A is gaining it Algol s name comes from the Arabic Ras al Ghulquot meaning demon star 0 51 Pegasi B a dim star visuable to the naked eye in darks skies was the rst star determinined to have a planet because of it s wobbliness basically the gravity of the star attracts the planet affecting its orbit but the planet also attracts the star also affecting its orbit
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