AST-L17-ch11__3

AST-L17-ch11__3 - AST 1002 Planets Stars and Galaxies...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Today’s Lecture: purpose & goals The Properties of Stars: a Ce l e s t i a l Cen s u s AST 1002 Planets, Stars and Galaxies 1) Review Measuring the Properties of Stars 2) Range of Stellar Properties stellar Temperature stellar Composition stellar Distance stellar Luminosity stellar Size stellar Mass 3) H-R diagrams 4) Mass-Luminosity Relation 5) Intro to Stellar Evolution We study stars by observing their light! 1) What we learn about stars from their light : measure stars’ Temperature (Blackbody radiation, Wien’s law) measure stars’ Composition (atomic spectra) H , He , traces of other elements measure stars’ Distance (parallax) Review Analyzing Starlight Wien’s Law: T (K) = 2,900,000/ λ max (nm) λ max (nm) = 2,900,000/T (K) Stefan-Boltzmann Law: L = 4 π R 2 . σ T 4 ecs) angle (arcs 1 arsecs) distance (p = We study stars by observing their light! 1) What we learn about stars from their light : stars’ Luminosity (calc. using Inverse Square Law) stars’ Size (calc. using rearranged Stefan-Boltzmann law)
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern