48 relations: Absorption spectroscopy, Angelo Secchi, Apparent magnitude, Astronomer, Astronomical unit, Asymptotic giant branch, Boss General Catalogue, Bright Star Catalogue, Canes Venatici, Carbon, Carbon monoxide, Carbon star, Carbon-13, Catalogues of Fundamental Stars, Chemical compound, Constellation, Convection, Dredge-up, Durchmusterung, Epoch (astronomy), Fusor (astronomy), Hans Schjellerup, Helium, Helium flash, Henry Draper Catalogue, Hipparcos, Horizontal branch, Hydrogen, Infrared, Kelvin, Light-year, Luminosity, Mars, Minute and second of arc, Molecule, Neutron, Nuclear fusion, Orbit, Planetary nebula, Red giant, Semiregular variable star, Smithsonian Astrophysical Observatory Star Catalog, Solar wind, Spectrum, Star, Temperature, Variable star, White dwarf.
Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of radiation, as a function of frequency or wavelength, due to its interaction with a sample.
Pietro Angelo Secchi SJ (29 June 1818 – 26 February 1878) was an Italian astronomer.
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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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An astronomer is a scientist in the field of astronomy who studies stars, planets, moons, comets, and galaxies, as well as many other celestial objects.
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The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun.
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The asymptotic giant branch is the region of the Hertzsprung–Russell diagram populated by evolving low- to medium-mass stars.
Boss General Catalogue (GC, sometimes General Catalogue) is an astronomical catalogue containing 33,342 stars.
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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Canes Venatici is one of the 88 official modern constellations.
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Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.
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Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is slightly less dense than air.
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A carbon star is a late-type star similar to a red giant (or occasionally to a red dwarf) whose atmosphere contains more carbon than oxygen; the two elements combine in the upper layers of the star, forming carbon monoxide, which consumes all the oxygen in the atmosphere, leaving carbon atoms free to form other carbon compounds, giving the star a "sooty" atmosphere and a strikingly ruby red appearance.
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Carbon-13 (13C) is a natural, stable isotope of carbon with a nucleus containing 6 protons and 7 neutrons.
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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.
A chemical compound (or just compound if used in the context of chemistry) is an entity consisting of two or more different atoms which associate via chemical bonds.
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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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Convection is the concerted, collective movement of groups or aggregates of molecules within fluids (e.g., liquids, gases) and rheids, through advection or through diffusion or as a combination of both of them.
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A dredge-up is a period in the evolution of a star where a surface convection zone extends down to the layers where material has undergone nuclear fusion.
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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 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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A fusor, according to a proposal to the IAU by Gibor Basri, Professor of Astronomy at the University of California, Berkeley to help clarify the nomenclature of celestial bodies, is "an object that achieves core fusion during its lifetime." This definition included any form of nuclear fusion so the lowest possible mass of a fusor was set at roughly 13 times that of Jupiter, at which point deuterium fusion becomes possible.
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Hans Carl Frederik Christian Schjellerup (February 8, 1827 – November 13, 1887) was a Danish astronomer.
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Helium is a chemical element with symbol He and atomic number 2.
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A helium flash is a very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the triple-alpha process in the core of low mass stars (between 0.8 solar masses and 2.0) during their red giant phase (the Sun is predicted to experience a flash 1.2 billion years after it leaves the main sequence).
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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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The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's.
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Hydrogen is a chemical element with chemical symbol H and atomic number 1.
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Infrared (IR) is invisible radiant energy, electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz) to 1 mm (300 GHz) (although people can see infrared up to at least 1050 nm in experiments).
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The kelvin is a unit of measure for temperature based upon an absolute scale.
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A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.
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In astronomy, luminosity is the total amount of energy emitted by a star, galaxy, or other astronomical object per unit time.
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Mars is the fourth planet from the Sun and the second smallest planet in the Solar System, after Mercury.
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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.
A molecule (from Latin moles "mass") is an electrically neutral group of two or more atoms held together by chemical bonds.
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The neutron is a subatomic particle, symbol or, with no net electric charge and a mass slightly larger than that of a proton.
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In nuclear physics, nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus.
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In physics, an orbit is the gravitationally curved path of an object around a point in space, for example the orbit of a planet around the center of a star system, such as the Solar System.
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A planetary nebula, often abbreviated as PN or plural PNe, is a kind of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars late in their lives.
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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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Semiregular variable stars are giants or supergiants of intermediate and late spectral type showing considerable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities.
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
The solar wind is a stream of charged particles released from the upper atmosphere of the Sun.
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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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A star is a luminous sphere of plasma held together by its own gravity.
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A temperature is an objective comparative measure of hot or cold.
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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A white dwarf, also called a degenerate dwarf, is a stellar remnant composed mostly of electron-degenerate matter.
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