What is luminosity

See all examples of luminosity. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. Translations of luminosity in Spanish.

See more. Need a translator? Translator tool. What is the pronunciation of luminosity? Browse luminary. Test your vocabulary with our fun image quizzes. Image credits. Word of the Day goodwill. Blog Outsets and onsets! Read More. November 08, To top. English American Examples Translations. Sign up for free and get access to exclusive content:. Free word lists and quizzes from Cambridge. Tools to create your own word lists and quizzes.

Word lists shared by our community of dictionary fans. Sign up now or Log in. First Known Use of luminosity , in the meaning defined at sense 1a. Learn More About luminosity. Time Traveler for luminosity The first known use of luminosity was in See more words from the same year. Style: MLA. Medical Definition of luminosity.

Get Word of the Day daily email! Test Your Vocabulary. Test your visual vocabulary with our question challenge! Love words? Need even more definitions? The inverse-square law of light means that the flux, l or intensity of a star at a distance d can be related to its luminosity L at a distance D by the following relationship:. At distance of 10 parsecs, D is represented by absolute magnitude, M and the flux at distance d is represented by the apparent magnitude, m then the luminosity ratio is given by:.

Example 1: Comparing brightness of two stars given apparent magnitudes. As Canopus has a lower value In fact Canopus is the second brightest star visible in the night sky after Sirius A whereas with an apparent magnitude of Example 2: Calculating brightness range for a variable star.

It was the first such star discovered and has given its name to a class of variable stars. The importance of these is discussed in a later section. In this type of problem we simply substitute in the two values for the apparent magnitudes for the same star so;.

Example 3: Comparing two stars' luminosities. How much more luminous is Betelgeuse than our Sun? Skip to main content. Australia Telescope National Facility. Accessibility menu. Interface Adjust the interface to make it easier to use for different conditions.

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