| Subject | 
has spectral type | 
is part of | 
has surface temperature | 
is an instance of | 
has rotation velocity | 
has color | 
has symbol | 
has absorption line | 
has relative abundance | 
has lifetime | 
is a kind of | 
has synonym | 
has definition | 
has luminosity class | 
| dwarf |   |   | greater than 1000 Kelvin |   |   |   | d |   |   |   | star | main sequence star | Star with mass equal to or less than that of the sun. More generally, any star on or below the main sequence in the Hertzprung-Russell diagram. | V | 
| O star | O, B, A, and early F |   | 35000 K |   | very high | blue-white |   | He II | rare | 3 to 6 million years | early star |   | Very hot blue star, whose spectra is dominated by the lines of singly ionized helium (see Pickering series). (Most other lines are from at least doubly ionized elements, though H and He I lines are also present.) O stars are useful because they are found in dust clouds and virtually define the spiral arms. |   | 
| runaway star | O star, B star |   | greater than 1000 Kelvin |   |   |   |   |   |   |   | early star |   | Star of spectral type O or early B with unusually high space velocities. Runaway stars are thought to be produced when there is a supernova explosion in a close binary system. |   | 
| AE Aurigae | O9.5 V | Auriga | 35000 K | dwarf | very high | blue-white | d | He II | rare | 3 to 6 million years |   | main sequence star | Runaway star which diverges from a comparatively small area in Orion. | V |