sentences:  The spectrum of this star matches a stellar classification of , with the luminosity class of III indicating that it is an evolved giant star that has exhausted the supply of hydrogen at its core and is now on the red giant branch.The 'Ca-1' portion of the classification indicates that it shows weaker than normal lines of calcium in its spectrum.Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.