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Astronomers use the Hertzsprung-Russell diagram to trace the evolutionary stage of a star. The Hertzsprung diagram where the evolution of sun-like stars is traced. Credits:ESO. This is a plot of temperature versus brightness, and as stars are born, live and die, they move in regular patterns around the Hertzsprung-Rusell diagram. 49+ Sample HR Letter Templates. The following items are samples of HR letters used for the different functions of the department. Inform employees that their resignation has been accepted by writing a letter. Announce your company's annual compensation bonus through a letter. Practically every store or company has an HR department or employee, depending on the size. It’s often the first person or department you talk to when you apply for a job as well as the person who helps you when you have questions about you... Hr diagram blank