Maybe Not. Iâve been talking about the death of the total cholesterol paradigm for ten years, and now the research is so strong that itâs time to send flowers. The total cholesterol, with its âgoodâ (HDL) and âbadâ (LDL) cholesterol paradigm, is dead. Taking its place is a new model of vascular biology, epigenomics, and nutragenomicsâhow foods (and supplements) influence heart health.
delta Cephei. The namesake star in the very important class of stars known as Cepheid variables, this star formed part of the original study in which Henrietta Leavitt first discovered that the periods of luminosity were related to their absolute luminosity.This has proved to be an important distance measuring tool.amed after delta-Cephei, Cepheid Variables are the most important type of variable because it has been discovered that their periods of variability are related to their absolute luminosity.
Some types of pulsating variable stars such as Cepheids exhibit a definite relationship between their period and their intrinsic luminosity. Such period-luminosity relationships are invaluable to astronomers as they are a vital method in calculating distances within and beyond our galaxy.