56-60 Flashcards
spectral type
O, B, A, F, G, K, M
hot………………….cold
B0……………………B9
Oh Be A Fine Girl, Kiss Me
Apparent double stars
two stars lying in the same direction but not in orbit with each other
true (visual) binary
2 stars orbiting each other that we can visually see
spectroscopic binaries
stars whose orbit is directly on our line of sight
eclipsing binaries
stars whose orbit is directly on our line of sight
center of mass
Ma x aa = Mb x ab
light curve
a cycle of variation in light of eclipsing binary stars
Stefan Boltzmann law
matter emits an amount of electromagnetic radiation that increases rapidly as the temperature climbs
L=(4pi x R^2) x (sigmaT^4)
Mass luminosity relation
L=M^3.5
narrow absorption lines
low density
wide absorption lines
high density
luminosity classes
V : densest and dimmest
I: largest and most luminous
stellar evolution cycle
interstellar cloud
protostar
pre-main sequence star
