34 relations: A-type main-sequence star, Am star, Apparent magnitude, Aries (constellation), Azimuth, Binary star, Bond (Chinese constellation), Bright Star Catalogue, Catalogues of Fundamental Stars, Chinese language, Constellation, Doppler effect, Durchmusterung, Elliptic orbit, Flamsteed designation, Gamma Arietis, Hamal, Henry Draper Catalogue, Hipparcos, Infrared excess, Mark III Stellar Interferometer, Minute and second of arc, Mount Wilson Observatory, Nearby Stars Database, Orbital elements, Parallax, Red giant, Smithsonian Astrophysical Observatory Star Catalog, Spectral line, Spitzer Space Telescope, Star catalogue, Stellar classification, Stellar rotation, Thermonuclear fusion.
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.
An Am star or metallic-line star is a type of chemically peculiar star of spectral type A whose spectrum has strong and often variable absorption lines of metals such as zinc, strontium, zirconium, and barium, and deficiencies of others, such as calcium and scandium.
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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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Aries is one of the constellations of the zodiac.
An azimuth (from Arabic al-sumūt, meaning "the directions") is an angular measurement in a spherical coordinate system.
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A binary star is a star system consisting of two stars orbiting around their common center of mass.
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Leu (or Low) sieu meaning "the Train of a garment", was one of the twenty-eight lunar mansions of the traditional Chinese astronomy.
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.
The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.
Chinese (汉语 / 漢語; Hànyǔ or 中文; Zhōngwén) is a group of related but in many cases mutually unintelligible language varieties, forming a branch of the Sino-Tibetan language family.
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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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The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source.
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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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In astrodynamics or celestial mechanics an elliptic orbit is a Kepler orbit with the eccentricity less than 1; this includes the special case of a circular orbit, with eccentricity equal to zero.
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Flamsteed designations for stars are similar to Bayer designations, except that they use numbers instead of Greek and Roman letters.
Gamma Arietis (γ Ari, γ Arietis) is the Bayer designation for a binary star system in the northern constellation of Aries.
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Hamal (α Ari, α Arietis, Alpha Arietis) is the brightest star in the northern zodiacal constellation of Aries.
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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 Mark III Stellar Interferometer was a long-baseline optical astronomical interferometer, located at the Mount Wilson Observatory, California, United States.
A minute of arc (MOA), arcminute (arcmin) or minute arc is a unit of angular measurement equal to one-sixtieth of one degree.
The Mount Wilson Observatory (MWO) is an astronomical observatory in Los Angeles County, California, United States.
The Nearby Stars Database (NStars) began as a NASA project in 1998 and is now based at Northern Arizona University.
Orbital elements are the parameters required to uniquely identify a specific orbit.
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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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A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
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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 catalogue, or star catalog, is an astronomical catalogue that lists stars.
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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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Thermonuclear fusion is a way to achieve nuclear fusion by using extremely high temperatures.