Astro 102 notes - Astro 102 notes 15 Surveying the Stars How Can we Study the Life cycles of stars A star can live for millions to billions of years We

Astro 102 notes - Astro 102 notes 15 Surveying the Stars...

This preview shows page 1 - 3 out of 7 pages.

Astro 102 notes 15. Surveying the StarsHow Can we Study the Life cycles of stars?
Image of page 1
Luminosity: Amount of power a star radiatesApparent brightness: amount of starlight that reaches earthParallax – Apparent wobble of a star due to the Earth’s orbiting of the SunMEASURING DISTANCES TO STARS (GET NOTES)Let’s define1parsec – 206,265A.U. = 3.26 light years d=1/pIf p is in arcsec and d is in parsecs, A star with a parallax of 1 arcsec is 1 parsec distant. The distances of nearer stars may be measured by observing their apparent motion as – theearth orbits around the sunIf the parallax of a star is mesasured to be 0.1 arseconds, its distance is 10 parsecs
Image of page 2
Image of page 3

You've reached the end of your free preview.

Want to read all 7 pages?

  • Summer '19
  • Stellar classification, main sequence, Red Giants, Stella Luminosity

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture