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## Measuring the Stars

by: Alyssa Karounos

103

0

2

# Measuring the Stars Astr 1010-100

Alyssa Karounos
UW
GPA 3.9
Introductory Astronomy 1
Dr. Oliver Fraser

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How do we measure stars? This lecture describes how we measure brightness, temperature, luminosity, size and mass of stars.
COURSE
Introductory Astronomy 1
PROF.
Dr. Oliver Fraser
TYPE
Class Notes
PAGES
2
WORDS
CONCEPTS
astronomy, stars, measuring, luminosity, temperature
KARMA
25 ?

## Popular in Astronomy

This 2 page Class Notes was uploaded by Alyssa Karounos on Friday February 6, 2015. The Class Notes belongs to Astr 1010-100 at University of Washington taught by Dr. Oliver Fraser in Winter2015. Since its upload, it has received 103 views. For similar materials see Introductory Astronomy 1 in Astronomy at University of Washington.

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Date Created: 02/06/15
24 15 1 Goals A explain how we measure stellar temperatures brightness distance luminosities sizes and masses II Brightness A Hipparchus star map of brightness 1 measures magnitudes 2 1 is the brightest 3 6 is the dimmest you can see with the naked eye 4 extended to 23 and 2 and now more magnitudes B brightest star doesn t determine size C point spread function issue of largeness or mirror on telescope 111 Temperature A are shining nor burning B color is quick measure of temperature thanks to Wien s Law 1 red is cool 2 yellow is medium 3 blue is hot C gas that s inVisible to the naked eye IV Luminosity A measuring energy per second B are they bright because they re close or because they re bright C constellations stars the rarest most illuminist stars giants D Use parallax geometric system 1 13600 of a degree arcseconds 2 a star with a parallax of 1 is 1 parsec pc away a 206265 times an Au 3 1 parsec is about 3ly away compare close stars with distance stars that don t change 9 5 solve parallax created a spacecraft that could measure parallaxes from space parallax only sure was to nd distance with both brightness and distance you can nd luminosity use magnitude from both luminosity and brightness 99 89 luminosity depends on size and temperature 10 Brightness apparent 11 luminosity energy output second absolute a apparent absolute at 10pc 12 L surface are x 6 Temp4 a L 47TR2T4 b L 0L R2T4 13 Temperature is way more important than size V Size and Mass star system pair of star together nd something falling towards a star using gravity equation nding a thing is hard so you use paris cannot see star moving look at spectrum Doppler effect if we nd an eclipse of stars they are moving towards us and away from us QWWUOWP

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