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20 relations: A-type main-sequence star, Apparent magnitude, Binary star, Canis Major, Constellation, Effective temperature, Epoch (astronomy), Giant star, International Celestial Reference System, Light-year, Minute and second of arc, Monthly Notices of the Royal Astronomical Society, Parallax, Photosphere, Proper motion, Solar luminosity, Star, Stellar classification, Stellar evolution, Stellar rotation.
A-type main-sequence 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.
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Apparent magnitude
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
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Binary star
A binary star is a star system consisting of two stars orbiting around their common barycenter.
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Canis Major
Canis Major is a constellation in the southern celestial hemisphere.
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Constellation
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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Effective 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.
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Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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Giant star
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
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International Celestial Reference System
The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU).
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
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Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
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Parallax
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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Photosphere
The photosphere is a star's outer shell from which light is radiated.
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Proper motion
Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.
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Solar luminosity
The solar luminosity,, is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun.
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Star
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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Stellar evolution
Stellar evolution is the process by which a star changes over the course of time.
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Stellar rotation
Stellar rotation is the angular motion of a star about its axis.
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