Plaskett's star Comparison Table

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Plaskett's star comparison table

Subject has spectral type is part of has surface temperature is an instance of has rotation velocity has color has absorption line has relative abundance has abundance has lifetime is a kind of has synonym has definition has luminosity class has number of star

giant greater than 1000 Kelvin star High-luminosity star that lies above the main sequence on the Hertzsprung-Russell diagram. III

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.

spectroscopic binary greater than 1000 Kelvin half the stars in the solar neighborhood are members of star systems binary star Star whose binary nature can be detected from the periodic Doppler shifts of their spectra, owing to their varying velocities in the line of sight. Double-lined spectroscopic binaries have two sets of spectral features, oscillating with opposite phases. Single-lined spectroscopic binaries have only one set of oscillating spectral lines, owing to the dimness of the secondary component. Spectroscopic binaries are typically of spectral type B, with almost circular orbits (whereas long-period M-type binaries have highly eccentric orbits). 2

Plaskett's star O, B, A, and early F Monoceros 35000 K spectroscopic binary very high blue-white He II rare half the stars in the solar neighborhood are members of star systems 3 to 6 million years HD 47129 A very massive O-type giant with known anomalies in its spectrum. It is a spectroscopic binary in which mass exchange is occurring. Its spectrum can be interpreted to mean that each component has a mass of 75 M_sun. III 2

Subject	has spectral type	is part of	has surface temperature	is an instance of	has rotation velocity	has color	has absorption line	has relative abundance	has abundance	has lifetime	is a kind of	has synonym	has definition	has luminosity class	has number of star
giant			greater than 1000 Kelvin								star		High-luminosity star that lies above the main sequence on the Hertzsprung-Russell diagram.	III
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.
spectroscopic binary			greater than 1000 Kelvin						half the stars in the solar neighborhood are members of star systems		binary star		Star whose binary nature can be detected from the periodic Doppler shifts of their spectra, owing to their varying velocities in the line of sight. Double-lined spectroscopic binaries have two sets of spectral features, oscillating with opposite phases. Single-lined spectroscopic binaries have only one set of oscillating spectral lines, owing to the dimness of the secondary component. Spectroscopic binaries are typically of spectral type B, with almost circular orbits (whereas long-period M-type binaries have highly eccentric orbits).		2
Plaskett's star	O, B, A, and early F	Monoceros	35000 K	spectroscopic binary	very high	blue-white	He II	rare	half the stars in the solar neighborhood are members of star systems	3 to 6 million years		HD 47129	A very massive O-type giant with known anomalies in its spectrum. It is a spectroscopic binary in which mass exchange is occurring. Its spectrum can be interpreted to mean that each component has a mass of 75 M_sun.	III	2

Next giant: red giant Up: giant, O star, spectroscopic binary Previous giant: oxygen-rich giant