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PCS 181 (133)
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Department
Physics
Course
PCS 181
Professor
Margaret Buckby
Semester
Fall

Description
Cephied distance problem D= 10 (m-M+5)/5 Remember cepied are always negative Use the chart per date first then follow the data line and go horizontal to find the other number 1- Days and magnitude of avg 15 days 2- What is the distance? 3- She want sit in pc and in ly 4- D+ (15-(-3)+5)/5 5- =10 exp(23/5)=10 exp(4.6) 6- D=4*10 ^4 pc and 1.3*10^5 ly 7- Rememrber the longer the period the brighter the star VELOCITY Recal radial velocity (Vr) is the component of the star’s velocity along our lone of sight Vr=c change in lambda/ lambda lab TANGENTAL VELOCITY (it cuts across your line of sight so like the prof wlaking back and forth in front of the class) The proper motion =profs a star and take a picture of her next to a tree and then 100 yrs later and another pictu
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