Hertzsprung-Russell diagram keywords (i.e., Hertzsprung-Russell (HR) diagram keywords): absolute magnitude, apparent magnitude, brightest stars, B-V, color index (AKA color), color temperature, effective temperature, Ejnar Hertzsprung (1873--1967), giant star, Henry Norris Russell (1877--1957), Hertzsprung-Russell (HR) diagram, luminosity, luminosity classes ( 0 := hypergiants See Wikipedia: List of most massive stars, where the current record massive star has mass ∼ 300 M_☉, Ia := supergiants, Ib := bright giants, III := giants, IV := subgiants, V := main-sequence stars which are also called dwarf stars, but that now seems a disfavored term, VI := subdwarf stars, VII := white dwarfs), luminosity distance, luminosity function (astronomy), magnitude, main sequence, nearest stars, OBAFGKM spectral classification, scatter diagram, solar luminosity units L_☉ = 3.828*10**26 W, solar mass units M_☉ = 1.98855(25)*10**30 kg, spectral type, star, stellar classification, stellar structure, Sun (solar luminosity units L_☉ = 3.828*10**26 W, solar mass units M_☉ = 1.98855(25)*10**30 kg), supergiant, Wikipedia: List of Brightest Stars, white dwarf, zero-age main sequence (ZAMS), etc.
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