Capella & Stellar classification - Unionpedia, the concept map

Apparent magnitude

Apparent magnitude is a measure of the brightness of a star or other astronomical object.

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Arcturus

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Astronomical spectroscopy

Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, ultraviolet, X-ray, infrared and radio waves that radiate from stars and other celestial objects.

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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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Betelgeuse

Betelgeuse is a red supergiant star in the constellation of Orion.

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Carbon

Carbon is a chemical element; it has 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 Centre) is a data centre which collects and distributes astronomical information.

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Color index

In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature.

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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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Eta Aurigae

Eta Aurigae (η Aurigae, abbreviated Eta Aur, η Aur), officially named Haedus, is a star in the northern constellation of Auriga.

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Giant star

A giant star has a substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.

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Helium

Helium (from lit) is a chemical element; it has symbol He and atomic number 2.

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Hertzsprung–Russell diagram

The Hertzsprung–Russell diagram (abbreviated as H–R diagram, HR diagram or HRD) is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities and their stellar classifications or effective temperatures.

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Hydrogen

Hydrogen is a chemical element; it has symbol H and atomic number 1.

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Infrared

Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves.

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International Astronomical Union

The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international non-governmental organization (INGO) with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach, education, and development through global cooperation.

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Kelvin

The kelvin, symbol K, is the base unit of measurement for temperature in the International System of Units (SI).

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Luminosity

Luminosity is an absolute measure of radiated electromagnetic energy (light) per unit time, and is synonymous with the radiant power emitted by a light-emitting object.

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Main sequence

In astronomy, the main sequence is a classification of stars which appear on plots of stellar color versus brightness as a continuous and distinctive band.

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Metallicity

In astronomy, metallicity is the abundance of elements present in an object that are heavier than hydrogen and helium.

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Oxygen

Oxygen is a chemical element; it has symbol O and atomic number 8.

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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 half-angle of inclination between those two lines.

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Pollux (star)

Pollux is the brightest star in the constellation of Gemini.

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Procyon

Procyon is the brightest star in the constellation of Canis Minor and usually the eighth-brightest star in the night sky, with an apparent visual magnitude of 0.34.

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Red dwarf

A red dwarf is the smallest kind of star on the main sequence.

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Rigel

Rigel is a blue supergiant star in the constellation of Orion.

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Sirius

Sirius is the brightest star in the night sky.

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Solar mass

The solar mass is a standard unit of mass in astronomy, equal to approximately.

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Solar radius

Solar radius is a unit of distance used to express the size of stars in astronomy relative to the Sun.

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Solar System

The Solar SystemCapitalization of the name varies.

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Spectral line

A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum.

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Star

A star is a luminous spheroid of plasma held together by self-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 its lifetime and how it can lead to the creation of a new star.

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Stellar rotation

Stellar rotation is the angular motion of a star about its axis.

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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 giant stars.

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Sun

The Sun is the star at the center of the Solar System.

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Vega

Vega is the brightest star in the northern constellation of Lyra.

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