Stars 1 Flashcards
What is another name for flux
Apparent brightness
Magnitude scale
Scale of 1-6, 1 being the brightest
What is color index
The difference between the magnitudes in two filters
What is the main influencer of spectra
Stellar temp
Order of stellar spectra classification
O,B,A,F,G,K,M,L,T,Y
What is the minimum mass of a star capable of fusion of hydrogen to helium
0.08
What are brown dwarfs
Objects that don’t reach 0.08 mass but are larger then planets
Effects of surface gravity
Lower pressure means fewer collisions between particles, leading to narrower spectral lines
Luminosity class V
Dwarfs, normal stars with relatively large broad spectral lines
Luminosity class IV
Subgiant
Luminosity class III and II
Giant, much thinner spectral features
Luminosity class I
Supergiant, thinnest spectral features
Hydrogen lines are strongest for ____ stars
A and B
Super hot stars
O
Super cold stars
M
O stars have ____ atmospheres
Fully ionized
M stars have all hydrogen…..
Completely in the ground state
What color are O stars
Blue
What color are b stars
Blue-white
What color are a stars
White
What color are F stars
Yellow- white
What color are g stars
Yellow
What color are k stars
Orange
What color are M stars
Red
