variable Comparison Table

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variable comparison table

Subject has spectral type has surface temperature has color has absorption line has period has amplitude is a kind of has emission line has synonym has definition

Be star 11000 to 28000 K blue-white He I B star at least one of the Balmer lines at some time Non-supergiant B-type stars, which have shown emission in at least one of the Balmer lines at some time.

bright blue variable greater than 1000 Kelvin variable Early-type high-luminosity star with peculiar spectra and large-amplitude light variations over a long time scale.

irregular variable greater than 1000 Kelvin variable

luminous blue variable O, B, A, and early F greater than 1000 Kelvin early star Hubble-Sandage variable A variable-star designation for the high-luminosity early type objects.

periodic variable greater than 1000 Kelvin variable

semiregular variable cooler than G2 greater than 1000 Kelvin variable late star A class of giant and supergiant pulsating stars of spectral class M, K, N, R, or S with a periodic (or semiperiodic) light curve of varying amplitude.

symbiotic star greater than 1000 Kelvin variable combination variable A term originally used by P. Merrill to describe stars of two essentially dissimilar kinds which seem to occur together and which seem to "need" each other. In practice, it has come to signify a peculiar group of objects (usually spectral type Me) that display a combination of low-temperature absorption spectra and high-temperature emission lines. These objects undergo semiperiodic nova-like outbursts and display the spectral changes of a slow nova superposed on the features of a late-type star. Their spectra are midway between those of planetary nebulae and true stellar objects. A symbiotic star is now usually taken to be a small, hot, blue star surrounded by an extensive variable envelope. As of 1973 about 30 were known.

Subject	has spectral type	has surface temperature	has color	has absorption line	has period	has amplitude	is a kind of	has emission line	has synonym	has definition
Be star		11000 to 28000 K	blue-white	He I			B star	at least one of the Balmer lines at some time		Non-supergiant B-type stars, which have shown emission in at least one of the Balmer lines at some time.
bright blue variable		greater than 1000 Kelvin					variable			Early-type high-luminosity star with peculiar spectra and large-amplitude light variations over a long time scale.
irregular variable		greater than 1000 Kelvin					variable
luminous blue variable	O, B, A, and early F	greater than 1000 Kelvin					early star		Hubble-Sandage variable	A variable-star designation for the high-luminosity early type objects.
periodic variable		greater than 1000 Kelvin					variable
semiregular variable	cooler than G2	greater than 1000 Kelvin				variable	late star			A class of giant and supergiant pulsating stars of spectral class M, K, N, R, or S with a periodic (or semiperiodic) light curve of varying amplitude.
symbiotic star		greater than 1000 Kelvin					variable		combination variable	A term originally used by P. Merrill to describe stars of two essentially dissimilar kinds which seem to occur together and which seem to "need" each other. In practice, it has come to signify a peculiar group of objects (usually spectral type Me) that display a combination of low-temperature absorption spectra and high-temperature emission lines. These objects undergo semiperiodic nova-like outbursts and display the spectral changes of a slow nova superposed on the features of a late-type star. Their spectra are midway between those of planetary nebulae and true stellar objects. A symbiotic star is now usually taken to be a small, hot, blue star surrounded by an extensive variable envelope. As of 1973 about 30 were known.

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