Astronomy Test 1
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Luminosity
Energy per time

Flux
 Apparent brightness
 Luminostiy per unit area
 Energy per unit time per unit area





Temperature approximation using color index


Luminosity and Temperature


Radii, Luminosities, and Temperatures

Types of Bianaries
 Apparent
 Visual
 Spectroscopic
 Eclipsing
 Astronomic




HR Diagram axis
 Absolute magnitudes or Luminosity
 Spectral types or Effective temperature

Spectroscopic Parallax
After finding a stars classification (from absorbtion lines) compare on HR Diagram to similar stars to find approximate absolute magnitute. Use the distance modulus to find distance.

Equations of Steller interrior
 Hydrostatic Equilibrium
 Mass Continuity
 Energy Transport (radiative and convective)
 Energy Generation


Equation of Radiative Energy Transport

Equation of Convective Energy Transport

Equation of Energy Generation

Gravitational Potential Energy

Nuclear Fussion in the Sun


Bianary MassOrbital Radius Relationship

Boltzmann's Equation
 Ratio increases as T goes to infinity



Population I stars
 Young
 High metal content
 Formed from dead stars
 All O and B are PopI

Population II stars
 Old
 Low Metal content
 First stars to form
 Low mass