CP 15 Surveying the Stars Flashcards
what does the brightness of a star depend on
distance and luminosity
what is luminocity
Amount of power a star
radiates
what is brightness
Amount of starlight that
reaches Earth
TF Hotter object = more light = less energy
F Hotter object = more light =more energy
what are the hottest and coldest temp of stars
Hottest stars= 50,000K
Coolest stars= 3000K
What are the Spectral types that reveal its temperature (abbreviation)
Hottest - OBAFGKM - Coolest
TF Most stars arent in binary systems
F, About half of all stars are in binary systems
what are the three types of binary star systems
Visual
Spectroscopic
Eclipsing
What is a visual binary star system
We can directly observe the orbital motions of these stars
what is a spectroscopic binary star system
We determine the orbit by measuring Doppler shifts
what is an eclipsing binary star system
We can measure periodic eclipses
what is a a hertzsprung-russell (HR) diagram
Depicts Temperature
Color
Spectral type
Luminosity
Radius
TF Most stars fall somewhere on the main sequence of the H-R diagram
T
What are giant and supergiant stars
Stars with lower Temperature and higher Luminosity than main-sequence stars (larger radii)
what are white dwarf stars
Stars with higher Temperature and lower Luminosity than main-sequence stars (smaller radii)
