sdO Comparison Table

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Next O star: Theta2 Orionis Up: O star, subdwarf Previous O star: Plaskett's star

sdO comparison table

Subject has spectral type has surface temperature has rotation velocity has color has symbol has absorption line has relative abundance has lifetime is a kind of has definition has luminosity class

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.

subdwarf greater than 1000 Kelvin sd star Late-type object whose observed color and absolute magnitude place it below the Main Sequence. VI

sdO 35000 K very high blue-white sd He II rare 3 to 6 million years subdwarf Subdwarf O star showing few very broad and shallow Balmer lines and a very strong He II 4686 line. VI

Subject	has spectral type	has surface temperature	has rotation velocity	has color	has symbol	has absorption line	has relative abundance	has lifetime	is a kind of	has definition	has luminosity class
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.
subdwarf		greater than 1000 Kelvin			sd				star	Late-type object whose observed color and absolute magnitude place it below the Main Sequence.	VI
sdO		35000 K	very high	blue-white	sd	He II	rare	3 to 6 million years	subdwarf	Subdwarf O star showing few very broad and shallow Balmer lines and a very strong He II 4686 line.	VI

Next O star: Theta2 Orionis Up: O star, subdwarf Previous O star: Plaskett's star