15 relations: A-type main-sequence star, Alan William James Cousins, Astronomer, Cambridge University Press, Color index, Effective temperature, Extinction (astronomy), Harold Johnson (astronomer), McDonald Observatory, Otto Struve Telescope, Photometric system, Stellar classification, Ultraviolet, United States, William Wilson Morgan.
An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen-burning) star of spectral type A and luminosity class V. These stars have spectra which are defined by strong hydrogen Balmer absorption lines.
Alan William James Cousins (8 August 1903 – 11 May 2001) was a South African astronomer.
An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside the scope of Earth.
Cambridge University Press (CUP) is the publishing business of the University of Cambridge.
In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature.
The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation.
In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.
Harold Lester Johnson (April 17, 1921 – April 2, 1980) was an American astronomer.
The McDonald Observatory is an astronomical observatory located near the unincorporated community of Fort Davis in Jeff Davis County, Texas, United States.
The Otto Struve Telescope was the first major telescope to be built at McDonald Observatory.
In astronomy, a photometric system is a set of well-defined passbands (or filters), with a known sensitivity to incident radiation.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.
William Wilson Morgan (January 3, 1906 – June 21, 1994) was an American astronomer and astrophysicist.
I band (infrared), Johnson magnitude, Johnson-Cousins photometric system, Johnson-Morgan system, R band, UBV Filter, UBV Filters, UBV filter, UBV filters, UBV system, UBVRI, UBVRI Filters, UBVRI system, Ubv System, Ubv system, Ultraviolet-Blue-Violet.