The total amount of Energy emitted (@ all wavelengths) per sec
What is LUMINOSITY?
100
Name of binaries, where both stars can be seen with a telescope.
What are Visual Binaries?
100
The primary reason that stellar spectra look different.
What is Temperature?
100
With masses between ~13.5 and ~80 Jupiter masses.
What are Brown Dwarfs?
100
90% of the stars inhabit THIS central region of the HR-Diagram (from upper-left to bottom-right).
What is the Main Sequence?
200
The measure of observed light (Energy) from a Star as seen from Earth.
What is BRIGHTNESS?
200
Appear single through telescope, but show to be double via a spectrum, and produce a radial-velocity-curve (radial velocity vs. time) that allows us to calculate stellar masses.
What are Spectroscopic Binaries?
200
Property of a star that BROADENS spectral lines due to Doppler Effect.
What is Rotational Velocity?
200
Also known as a "retired star," it is a dead star, burned out hot cinder, made mostly of Carbon.
What is a White Dwarf?
200
What the HR-Diagram plots on its x-axis.
What is Temperature (or Spectral Type)?
300
The process of measuring Brightness of stars.
What is Photometry?
300
As viewed from Earth, the Luminosity drops as one star passes in front of the other during every revolution. Their Light-Curve allows us to calculate their sizes.
What are Eclipsing Binaries?
300
Spectroscopic Binaries produce a radial-velocity-curve that allows us to calculate THIS property of stars when using Newton's reformulation of Kepler's 3rd Law (P^2 = D^3).
What is Mass?
300
What every white dwarf eventually becomes as it looses it's heat in some large amount of time in the future.
What is a Black Dwarf?
300
What the HR-Diagram plots on its y-axis
What is Stellar Luminosity?
400
The difference between 2 different filter magnitudes.
What is Color (Index)?
400
A plot of LUMINOSITY vs. TIME. (as for Eclipsing Binaries)
What is a Light Curve?
400
Eclipsing Binaries are used to measure this stellar property to high precision.
What is Size?
400
These inhabit the lower-left hand side of an HR-Diagram.
What is a White Dwarf?
400
Found on the upper-right hand corner of the HR-Diagram.
What are Giants, and/or Super Giants?
500
Motion of a star (perpendicular to our line of sight) across the sky/celestial sphere.
What is Proper Motion
500
A plot showing how VELOCITY vs. TIME (velocity of stars changing w/time).
What is a Radial-Velocity Curve?
500
Triangulation (or parallax), Variable Stars, and the HR-diagram are only three techniques to obtain THIS property of a star.
What is Distance?
500
1st discovered in 1995, these are cooler than an M9 star, they are not hot enough for nuclear fussion, thus are extremely faint and hard to find.
What is a Brown Dwarf?
500
Found on the lower-right hand corner of the HR-Diagram.