Lecture 18 - start of exam 4

Lecture 18 - start of exam 4 - Lecture 18 11/9/10 Cluster...

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

View Full Document Right Arrow Icon
Lecture 18 – 11/9/10 Cluster fitting- stars are about the same distance to uncertainty in distance disappears a) Stars can be compared in the cluster by their age Spectroscopic parallax- if two stars have identical spectra, then we assume that they have nearly identical physical properties a) Can only do parallax to nearby stars b) Isn’t very accurate Observed star facts: a) Stars are constantly forming b) Hot, blue stars are young and cool, red stars are old c) Star forms from stable gas clouds and dust d) Stars form in groups because one gas cloud makes more than one star Intersteller dust- dark spot that blocks view of stars on other side a) Scatters red light/large particles due to redding of stars on border of it Shock-wave theory of star formation a) Blast wave shocks cloud of gas and compress the gas cloud i) Gravity and pressure prevented it from being compressed but the shockwave disrupted this b) Compression causes gas cloud to fragment c) Stars form within each of these new fragment
Background image of page 1

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

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

This note was uploaded on 05/03/2011 for the course AST 301 taught by Professor Harvey during the Fall '07 term at University of Texas at Austin.

Page1 / 2

Lecture 18 - start of exam 4 - Lecture 18 11/9/10 Cluster...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online