Physics 202: Introduction to Astronomy – Lecture 15 Carsten Denker Physics Department Center for...

Physics 202: Introduction to Astronomy – Lecture 15

Carsten Denker

Physics DepartmentCenter for Solar–Terrestrial

Research

March 31, 2006 Center for Solar-Terrestrial Research

Spectroscopic parallax

Luminosity classes Stellar Masses Binary-star systems Visual binaries Eclipsing binaries Spectroscopic

binaries Star clusters

Open clusters Associations Globular clusters

H-R Diagram and Star Clusters

Stellar sizes Direct

measurements Luminosity-

temperature-radius relationship

Giants and dwarfs Hertzsprung-Russell

diagram Main-sequence Distance scale

March 31, 2006 Center for Solar-Terrestrial Research

Stellar Sizes

March 31, 2006 Center for Solar-Terrestrial Research

Cosmic Distance Scale

2

luminosityapparent brightness

distance

2 4luminosity radius temperature

March 31, 2006 Center for Solar-Terrestrial Research

Stellar Masses

March 31, 2006 Center for Solar-Terrestrial Research

Hertzsprung-Russell Diagram

Nearby stars

March 31, 2006 Center for Solar-Terrestrial Research

Brightest stars Hipparcos catalogue

March 31, 2006 Center for Solar-Terrestrial Research

March 31, 2006 Center for Solar-Terrestrial Research

Star Clusters