32 relations: A-type main-sequence star, Apparent magnitude, Aquila (constellation), Astronomische Gesellschaft Katalog, Bayer designation, Bortle scale, Bright Star Catalogue, Celestial equator, Constellation, Delta Scuti variable, Durchmusterung, Effective temperature, Extinction (astronomy), Flamsteed designation, General Catalogue of Stellar Radial Velocities, Henry Draper Catalogue, Hipparcos, Infrared excess, Instability strip, Interstellar medium, Lambda Boötis star, Margin of error, Minute and second of arc, Parallax, Smithsonian Astrophysical Observatory Star Catalog, Spectrum, Spitzer Space Telescope, Star, Stellar atmosphere, Stellar classification, Stellar rotation, Variable star.
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.
The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.
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Aquila is a constellation in the northern sky.
The Astronomische Gesellschaft Katalog (AGK) is an astrometric star catalogue.
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name.
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The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location.
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The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth.
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The celestial equator is a great circle on the imaginary celestial sphere, in the same plane as the Earth's equator.
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In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).
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A Delta Scuti variable (sometimes termed dwarf cepheid) is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface.
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In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.
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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.
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Extinction is a term used in astronomy to describe the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the observer.
Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek and Roman letters.
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The General Catalogue of Stellar Radial Velocities is a star catalogue which lists radial velocities for 15,107 stars.
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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An infrared excess is a measurement of an astronomical source, typically a star, that in their spectral energy distribution has a greater measured infrared flux than expected by assuming the star is a blackbody radiator.
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The unqualified term instability strip usually refers to a region of the Hertzsprung–Russell diagram largely occupied by several related classes of pulsating variable stars: Delta Scuti variables, SX Phoenicis variables, and rapidly oscillating Ap (roAp) stars near the main sequence; RR Lyrae variables where it intersects the horizontal branch; and the Cepheid variables where it crosses the supergiants.
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In astronomy, the interstellar medium (ISM) is the matter that exists in the space between the star systems in a galaxy.
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A Lambda Boötis star is a type of peculiar star which has an unusually low abundance of iron peak elements in its surface layers.
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The margin of error is a statistic expressing the amount of random sampling error in a survey's results.
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A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth of one degree.
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary infinitely within a continuum.
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The Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space observatory launched in 2003.
A star is a luminous sphere of plasma held together by its own gravity.
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The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone.
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In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
Stellar rotation is the angular motion of a star about its axis.
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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