Lambda Geminorum, the Glossary

Table of Contents

1. 30 relations: A-type main-sequence star, Angular distance, Apparent magnitude, Binary star, Circumstellar disc, Constellation, Edwin Brant Frost, Effective temperature, Epoch (astronomy), Gemini (constellation), Giant star, Hyades Stream, Infrared excess, K band (infrared), Latinisation of names, Light-year, Occultation, Photosphere, Position angle, Radial velocity, Star, Stellar classification, Stellar core, Stellar evolution, Stellar nucleosynthesis, Stellar parallax, Stellar rotation, Subgiant, Tidal tail, Variable star.

A-type main-sequence star

An A-type main-sequence star (A) or A dwarf star is a main-sequence (hydrogen burning) star of spectral type A and luminosity class (five). Lambda Geminorum and a-type main-sequence star are a-type main-sequence stars.

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Angular distance

Angular distance or angular separation is the measure of the angle between the orientation of two straight lines, rays, or vectors in three-dimensional space, or the central angle subtended by the radii through two points on a sphere.

See Lambda Geminorum and Angular distance

Apparent magnitude

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

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Binary star

A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.

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Circumstellar disc

A circumstellar disc (or circumstellar disk) is a torus, pancake or ring-shaped accretion disk of matter composed of gas, dust, planetesimals, asteroids, or collision fragments in orbit around a star. Lambda Geminorum and circumstellar disc are circumstellar disks.

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Constellation

A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.

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Edwin Brant Frost

Edwin Brant Frost II (July 14, 1866 – May 14, 1935) was an American astronomer and longest serving Director of the Yerkes Observatory serving from 1905 to 1932.

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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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Epoch (astronomy)

In astronomy, an epoch or reference epoch is a moment in time used as a reference point for some time-varying astronomical quantity.

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Gemini (constellation)

Gemini is one of the constellations of the zodiac and is located in the northern celestial hemisphere.

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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.

See Lambda Geminorum and Giant star

Hyades Stream

The Hyades Stream (or Hyades moving group) is a large collection of scattered stars that also share a similar trajectory with the Hyades Cluster.

See Lambda Geminorum and Hyades Stream

Infrared excess

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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K band (infrared)

In infrared astronomy, the K band is an atmospheric transmission window centered on 2.2 μm (in the near-infrared 136 THz range).

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Latinisation of names

Latinisation (or Latinization) of names, also known as onomastic Latinisation, is the practice of rendering a non-Latin name in a modern Latin style.

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Light-year

A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 1012 km), which is approximately 5.88 trillion mi.

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Occultation

An occultation is an event that occurs when one object is hidden from the observer by another object that passes between them.

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Photosphere

The photosphere is a star's outer shell from which light is radiated.

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Position angle

In astronomy, position angle (usually abbreviated PA) is the convention for measuring angles on the sky.

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Radial velocity

The radial velocity or line-of-sight velocity of a target with respect to an observer is the rate of change of the vector displacement between the two points.

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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 core

A stellar core is the extremely hot, dense region at the center of a star.

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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 nucleosynthesis

In astrophysics, stellar nucleosynthesis is the creation of chemical elements by nuclear fusion reactions within stars.

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Stellar parallax

Stellar parallax is the apparent shift of position (parallax) of any nearby star (or other object) against the background of distant stars.

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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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Tidal tail

A tidal tail is a thin, elongated region of stars and interstellar gas that extends into space from a galaxy.

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Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes with time.

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References

[1] https://en.wikipedia.org/wiki/Lambda_Geminorum

Also known as 54 Geminorum, Lambda Gem, Λ Gem, Λ Geminorum.