(of stellar atmosphere)
31Otto Struve — Not to be confused with his grandfather Otto Wilhelm von Struve (1819–1905) Otto Struve Born August 12, 1897(1897 08 12) Kharkiv, Russian Empire Died …
32Delta Pavonis — Observation data Epoch J2000      Equinox J2000 Constellation Pavo Right ascension 20h 08m 43.6084s[1] …
33Limb darkening — refers to the diminishing of intensity in the image of a star as one moves from the center of the image to the edge or limb of the image. Limb darkening occurs as the result of two effects:* The density of the star diminishes as the distance from …
34Star lifting — is any of several hypothetical processes by which a highly advanced civilization (at least Kardashev II) could remove a substantial portion of a star s matter in a controlled manner for other uses. The term appears to have been coined by David… …
35Dredge-up — refers to a period in the evolution of a star where a surface convection zone extends down to the layers where material has undergone nuclear fusion. As a result, the fusion products are mixed into the outer layers of the stellar atmosphere and… …
36Milky Way Galaxy — Large spiral galaxy (roughly 150,000 light years in diameter) that contains Earth s solar system. It includes the multitude of stars whose light is seen as the Milky Way, the irregular luminous band that encircles the sky defining the plane of… …
37Alpha Andromedae — α Andromedae Observation data …
38Variable star — A star is classified as variable if its apparent brightness as seen from Earth changes over time, whether the changes are due to variations in the star s actual luminosity, or to variations in the amount of the star s light that is blocked from… …
39Hertzsprung–Russell diagram — Hertzsprung–Russell diagram[1] with 22,000 stars plotted from the Hipparcos catalog and 1,000 from the Gliese catalog of nearby stars. Stars tend to fall only into certain regions of the diagram. The most predominant is the diagonal, going from… …
40Hertzsprung-Russell diagram — The Hertzsprung Russell diagram (usually referred to by the abbreviation H R diagram or HRD, also known as a colour magnitude diagram, or CMD) shows the relationship between absolute magnitude, luminosity, classification, and effective… …
