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30 relations: Apparent magnitude, Barnard's Star, BY Draconis, Cambridge University Press, Carlos Jaschek, Chromosphere, CNO cycle, Convection, Cuno Hoffmeister, Flare star, Gerald Kron, Kapteyn's Star, Lacaille 8760, Lalande 21185, Light curve, Luminosity, Luyten 726-8, Main sequence, Procyon, Proton–proton chain reaction, Quasiperiodicity, Ross 248, RS Canum Venaticorum variable, Star, Starspot, Stellar classification, Subgiant, Sun, Variable star, 61 Cygni.
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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Barnard's Star
Barnard's Star is a very-low-mass red dwarf about 6 light-years away from Earth in the constellation of Ophiuchus.
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BY Draconis
BY Draconis is a multiple star system in the constellation Draco, consisting of at least three components.
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Cambridge University Press
Cambridge University Press (CUP) is the publishing business of the University of Cambridge.
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Carlos Jaschek
Carlos Jaschek (March 2, 1926 – April 12, 1999) was a German-born Argentine astrophysicist who spent time in the United States, lived in Switzerland, settled in France, became a French citizen Be Star Newsletter #34; pp.
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Chromosphere
The chromosphere (literally, "sphere of color") is the second of the three main layers in the Sun's atmosphere and is roughly 3,000 to 5,000 kilometers deep.
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CNO cycle
The CNO cycle (for carbon–nitrogen–oxygen) is one of the two known sets of fusion reactions by which stars convert hydrogen to helium, the other being the proton–proton chain reaction.
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Convection
Convection is the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock (rheid).
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Cuno Hoffmeister
Cuno Hoffmeister (2 February 1892 – 2 January 1968) was a German astronomer, observer and discoverer of variable stars, comets and minor planets, and founder of Sonneberg Observatory.
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Flare star
A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes.
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Gerald Kron
Gerald Kron (April 6, 1913 – April 9, 2012) was an American astronomer who was one of the pioneers of high-precision photometry with photoelectric instrumentation.
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Kapteyn's Star
Kapteyn's Star is a class M1 red subdwarf about 12.76 light years from Earth in the southern constellation Pictor; it is the closest halo star to the Solar System.
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Lacaille 8760
Lacaille 8760 (AX Microscopii) is a red dwarf star in the constellation Microscopium.
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Lalande 21185
Lalande 21185 is a star in the constellation of Ursa Major, relevant for being the brightest red dwarf observable in the northern hemisphere (only AX Microscopii and Lacaille 9352, in the southern hemisphere, are brighter).
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Light curve
In astronomy, a light curve is a graph of light intensity of a celestial object or region, as a function of time.
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Luminosity
In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
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Luyten 726-8
Luyten 726-8, also known as Gliese 65, is a binary star system that is one of Earth's nearest neighbors, at about 8.7 light years from Earth in the constellation Cetus.
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Main sequence
In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.
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Procyon
Procyon, also designated Alpha Canis Minoris (α Canis Minoris, abbreviated Alpha CMi, α CMi), is the brightest star in the constellation of Canis Minor.
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Proton–proton chain reaction
The proton–proton chain reaction is one of the two (known) sets of fusion reactions by which stars convert hydrogen to helium.
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Quasiperiodicity
Quasiperiodicity is the property of a system that displays irregular periodicity.
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Ross 248
Ross 248, also called HH Andromedae or Gliese 905, is a small star located approximately from Earth in the northern constellation of Andromeda.
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RS Canum Venaticorum variable
RS Canum Venaticorum variables are a type of variable star.
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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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Starspot
Starspots are stellar phenomena.
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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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Subgiant
A subgiant is a star that is brighter than a normal main-sequence star of the same spectral class, but not as bright as true giant stars.
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Sun
The Sun is the star at the center of the Solar System.
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Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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61 Cygni
61 Cygni Not to be confused with 16 Cygni, a more distant system containing two G-type stars harboring the gas giant planet 16 Cygni Bb.
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Redirects here:
BY Dra variable, BY Dra variable star, BY Dra variable stars, BY Dra variables, BY Draconis star, BY Draconis variable star, BY Draconis variable stars, BY Draconis variables, By draconis variable.
References
[1] https://en.wikipedia.org/wiki/BY_Draconis_variable
