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20 relations: Astronomical object, Asymptotic giant branch, Carbon, Centre de données astronomiques de Strasbourg, Effective temperature, Gravity wave, Helium, Hydrogen, Luminosity, Metre per second squared, Normal mode, Nuclear fusion, Oxygen, PG 1159-035, Planetary nebula, Second, Star, Surface gravity, Ultraviolet, White dwarf.
Astronomical object
An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe.
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Asymptotic giant branch
The asymptotic giant branch (AGB) is a region of the Hertzsprung–Russell diagram populated by evolved cool luminous stars.
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Carbon
Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.
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Centre de données astronomiques de Strasbourg
The Centre de Données astronomiques de Strasbourg (CDS; English translation: Strasbourg Astronomical Data Center) is a data hub which collects and distributes astronomical information.
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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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Gravity wave
In fluid dynamics, gravity waves are waves generated in a fluid medium or at the interface between two media when the force of gravity or buoyancy tries to restore equilibrium.
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Helium
Helium (from lit) is a chemical element with symbol He and atomic number 2.
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Hydrogen
Hydrogen is a chemical element with symbol H and atomic number 1.
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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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Metre per second squared
The metre per second squared is the unit of acceleration in the International System of Units (SI).
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Normal mode
A normal mode of an oscillating system is a pattern of motion in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation.
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Nuclear fusion
In nuclear physics, nuclear fusion is a reaction in which two or more atomic nuclei come close enough to form one or more different atomic nuclei and subatomic particles (neutrons or protons).
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Oxygen
Oxygen is a chemical element with symbol O and atomic number 8.
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PG 1159-035
PG 1159-035 is the prototypical PG 1159 star after which the class of PG 1159 stars was named.
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Planetary nebula
A planetary nebula, abbreviated as PN or plural PNe, is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
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Second
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
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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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Surface gravity
The surface gravity, g, of an astronomical or other object is the gravitational acceleration experienced at its surface.
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Ultraviolet
Ultraviolet (UV) is electromagnetic radiation with a wavelength from 10 nm to 400 nm, shorter than that of visible light but longer than X-rays.
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White dwarf
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
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