Population II star Comparison Table

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Population II star comparison table

Subject has spectral type has optical brightness variation has light curve has observational problem has prototype has period has amplitude has absolute magnitude occur in has name designated with has observable variation time scale has synonym has definition

blue halo star halo star Hot star in the horizontal-branch, post-horizontal-branch, and post-asymptotic branch phases of evolution.

blue horizontal-branch star HZ star Blue horizontal-branch star, the first catalog of which was compiled by Humason and Zwicky.

field horizontal branch star B star or A star halo star High-velocity metal-weak star of either B or A spectral type.

Population II Cepheid F star, G star and K star 0.2 magnitudes or greater some difficulty in distinguishing between various kinds delta Cephei 10 to 30 days <M_v> = 0 to -3 globular clusters
R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name
RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted
AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted
V 335, V 336, etc., when the double letter designations are exhausted
within a period of decades W Virginis star A bright yellow star that pulsates like a Cepheid but is older and fainter.

Subject	has spectral type	has optical brightness variation	has light curve	has observational problem	has prototype	has period	has amplitude	has absolute magnitude	occur in	has name designated with	has observable variation time scale	has synonym	has definition
blue halo star												halo star	Hot star in the horizontal-branch, post-horizontal-branch, and post-asymptotic branch phases of evolution.
blue horizontal-branch star												HZ star	Blue horizontal-branch star, the first catalog of which was compiled by Humason and Zwicky.
field horizontal branch star	B star or A star											halo star	High-velocity metal-weak star of either B or A spectral type.
Population II Cepheid	F star, G star and K star	0.2 magnitudes or greater		some difficulty in distinguishing between various kinds	delta Cephei	10 to 30 days		<M_v> = 0 to -3	globular clusters	R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted V 335, V 336, etc., when the double letter designations are exhausted	within a period of decades	W Virginis star	A bright yellow star that pulsates like a Cepheid but is older and fainter.

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