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Subgiant

Index 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. [1]

85 relations: Absolute magnitude, Aldebaran, Alpha Centauri, Balmer series, Bellatrix, Beta Aquilae, Beta Aurigae, Beta Cassiopeiae, Beta Cephei, Beta Cephei variable, Beta Scorpii, Beta Serpentis, Calcium, Cepheid variable, Classical Cepheid variable, CNO cycle, Convective overshoot, Delta Circini, Delta Geminorum, Delta Herculis, Delta Scorpii, Delta Scuti variable, Eta Boötis, Eta Cephei, Eta Ursae Majoris, FK Comae Berenices, Gamma Cassiopeiae, Gamma Cephei, Gamma Pegasi, Gamma Serpentis, Giant star, Globular cluster, HD 224693 b, Hertzsprung gap, Hertzsprung–Russell diagram, Hydrogen, Instability strip, Iota Herculis, Iron, Kappa Andromedae b, Lambda Scorpii, Lambda Ursae Majoris, Magnesium, Main sequence, Messier 67, Mu Cancri, Mu Herculis, Omega Centauri, Omicron Persei, Open cluster, ..., Pi Scorpii, Procyon, Red dwarf, Red giant, Red-giant branch, Roman numerals, Schönberg–Chandrasekhar limit, Sirius, Slowly pulsating B-type star, Spectral line shape, Star, Stellar classification, Stellar evolution, Stellar population, Strontium, Sun, Supergiant star, SV Vulpeculae, Tau Boötis, Tau Herculis, Theta Boötis, Theta Draconis, Theta Ophiuchi, Theta2 Orionis, Titanium, Titanium oxide, Upsilon Andromedae, Variable star, Virial theorem, Zeta Cassiopeiae, Zeta Herculis, Zeta Serpentis, 110 Herculis, 31 Comae Berenices, 61 Cygni. Expand index (35 more) »

Absolute magnitude

Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.

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Aldebaran

Aldebaran, designated Alpha Tauri (α Tauri, abbreviated Alpha Tau, α Tau), is an orange giant star located about 65 light-years from the Sun in the zodiac constellation of Taurus.

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Alpha Centauri

Alpha Centauri (α Centauri, abbreviated Alf Cen or α Cen) is the star system closest to the Solar System, being from the Sun.

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Balmer series

The Balmer series or Balmer lines in atomic physics, is the designation of one of a set of six named series describing the spectral line emissions of the hydrogen atom.

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Bellatrix

Bellatrix, also designated Gamma Orionis (γ Orionis, abbreviated Gamma Ori, γ Ori), is the third-brightest star in the constellation of Orion, 5° west of the red giant Alpha Orionis (Betelgeuse).

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Beta Aquilae

Beta Aquilae, Latinized from β Aquilae (abbreviated Beta Aql or β Aql) is a binary star in the equatorial constellation of Aquila.

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Beta Aurigae

Beta Aurigae (β Aurigae, abbreviated Beta Aur, β Aur), also named Menkalinan, is a binary star system in the northern constellation of Auriga.

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Beta Cassiopeiae

Beta Cassiopeiae (β Cassiopeiae, abbreviated Beta Cas or β Cas), also named Caph, is a Delta Scuti variable star in the constellation of Cassiopeia.

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Beta Cephei

Beta Cephei (β Cephei, abbreviated Beta Cep, β Cep), also named Alfirk, is a third magnitude star in the constellation of Cepheus.

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Beta Cephei variable

Beta Cephei variables, also known as Beta Canis Majoris stars, are variable stars that exhibit small rapid variations in their brightness due to pulsations of the stars' surfaces, thought due to the unusual properties of iron at temperatures of 200,000 K in their interiors.

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Beta Scorpii

Beta Scorpii (β Scorpii, abbreviated Beta Sco, β Sco) is a multiple star system in the southern zodiac constellation of Scorpius.

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Beta Serpentis

Beta Serpentis, Latinized from β Serpentis, is a binary star system in the constellation Serpens, in its head (Serpens Caput).

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Calcium

Calcium is a chemical element with symbol Ca and atomic number 20.

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Cepheid variable

A Cepheid variable is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude.

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Classical Cepheid variable

Classical Cepheids (also known as Population I Cepheids, Type I Cepheids, or Delta Cephei variables) are a type of Cepheid variable star.

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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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Convective overshoot

Convective overshoot is a phenomenon of convection carrying material beyond an unstable region of the atmosphere into a stratified, stable region.

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Delta Circini

Delta Circini (δ Cir), is a multiple star system located in the constellation Circinus. Delta Circini is also known as HR 5664, and HD 135240. The system has a combined apparent visual magnitude of +5.09, and is located at a distance of 770 pc (2,500ly) from the Sun.

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Delta Geminorum

Delta Geminorum (δ Geminorum, abbreviated Delta Gem, δ Gem), also named Wasat, is a triple star system in the constellation of Gemini.

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Delta Herculis

Delta Herculis (δ Herculis, abbreviated Delta Her, δ Her) is a multiple star system in the constellation of Hercules.

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Delta Scorpii

Delta Scorpii (δ Scorpii, abbreviated Delta Sco, δ Sco) is a binary star (the presence of a third star in the system is still being debated) in the constellation of Scorpius.

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Delta Scuti variable

A Delta Scuti variable (sometimes termed dwarf cepheid) is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface.

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Eta Boötis

Eta Boötis (η Boötis, abbreviated Eta Boo, η Boo) is a binary star in the constellation of Boötes.

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Eta Cephei

Eta Cephei (η Cep, η Cephei) is a star in the northern circumpolar constellation of Cepheus.

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Eta Ursae Majoris

Eta Ursae Majoris (η Ursae Majoris, abbreviated Eta UMa, η UMa), also named Alkaid, is a star in the constellation of Ursa Major.

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FK Comae Berenices

FK Comae Berenices is a variable star that varies in apparent magnitude between 8.14m and 8.33m over a period of 2.4 days.

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Gamma Cassiopeiae

Gamma Cassiopeiae, Latinized from γ Cassiopeiae, is a star at the center of the distinctive "W" asterism in the northern circumpolar constellation of Cassiopeia.

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Gamma Cephei

Gamma Cephei (γ Cephei, abbreviated Gamma Cep, γ Cep) is a binary star system approximately 45 light-years away in the constellation of Cepheus.

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Gamma Pegasi

Gamma Pegasi (γ Pegasi, abbreviated Gamma Peg or γ Peg), also named Algenib, is a star in the constellation of Pegasus, located at the southwest corner of the asterism known as the Great Square.

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Gamma Serpentis

Gamma Serpentis (γ Serpentis, γ Ser) is a star in the equatorial constellation Serpens, in the part of the constellation that represents the serpent's head (Serpens Caput).

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Giant star

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

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Globular cluster

A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.

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HD 224693 b

HD 224693 b is an extrasolar planet orbiting the star HD 224693 every 27 days with a minimum mass 71% of Jupiter.

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Hertzsprung gap

The Hertzsprung Gap is a feature of the Hertzsprung–Russell diagram for a star cluster.

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Hertzsprung–Russell diagram

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

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Hydrogen

Hydrogen is a chemical element with symbol H and atomic number 1.

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Instability strip

The unqualified term instability strip usually refers to a region of the Hertzsprung–Russell diagram largely occupied by several related classes of pulsating variable stars: Delta Scuti variables, SX Phoenicis variables, and rapidly oscillating Ap stars (roAps) near the main sequence; RR Lyrae variables where it intersects the horizontal branch; and the Cepheid variables where it crosses the supergiants.

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Iota Herculis

Iota Herculis (ι Her, ι Herculis) is a fourth-magnitude variable star in the constellation Hercules.

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Iron

Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.

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Kappa Andromedae b

Kappa Andromedae b is a substellar object and massive planet or brown dwarf orbiting Kappa Andromedae, a star in the Andromeda constellation, about 170 light years away.

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Lambda Scorpii

Lambda Scorpii (λ Scorpii, abbreviated Lambda Sco, λ Sco), also named Shaula, is (despite being designated 'Lambda') the second-brightest star system in the constellation of Scorpius, and one of the brightest stars in the nighttime sky.

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Lambda Ursae Majoris

Lambda Ursae Majoris (λ Ursae Majoris, abbreviated Lambda UMa, λ UMa), also named Tania Borealis, is a star in the northern circumpolar constellation of Ursa Major.

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Magnesium

Magnesium is a chemical element with symbol Mg and atomic number 12.

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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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Messier 67

Messier 67 (also known as M67 or NGC 2682) is an open cluster in the constellation of Cancer.

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Mu Cancri

Mu Cancri (μ Cancri, μ Cnc, Mu Cnc) is the name of several stars.

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Mu Herculis

Mu Herculis (μ Herculis) is a nearby star system about 27.1 light years from Earth in the constellation Hercules.

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Omega Centauri

Omega Centauri (ω Cen or NGC 5139) is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677.

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Omicron Persei

Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus.

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Open cluster

An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.

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Pi Scorpii

Pi Scorpii (π Scorpii, abbreviated Pi Sco, π Sco) is a triple star system in the southern constellation of Scorpius.

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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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Red dwarf

A red dwarf (or M dwarf) is a small and relatively cool star on the main sequence, of M spectral type.

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Red giant

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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Red-giant branch

The red-giant branch (RGB), sometimes called the first giant branch, is the portion of the giant branch before helium ignition occurs in the course of stellar evolution.

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Roman numerals

The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages.

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Schönberg–Chandrasekhar limit

In stellar astrophysics, the Schönberg–Chandrasekhar limit is the maximum mass of a non-fusing, isothermal core that can support an enclosing envelope.

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Sirius

Sirius (a romanization of Greek Σείριος, Seirios,."glowing" or "scorching") is a star system and the brightest star in the Earth's night sky.

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Slowly pulsating B-type star

A slowly pulsating B-type star (SPB), formerly known as a 53 Persei variable, is a type of pulsating variable star.

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Spectral line shape

Spectral line shape describes the form of a feature, observed in spectroscopy, corresponding to an energy change in an atom, molecule or ion.

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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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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 time.

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Stellar population

During 1944, Walter Baade categorized groups of stars within the Milky Way into bluer stars associated with the spiral arms and the general position of yellow stars near the central galactic bulge or within globular star clusters.

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Strontium

Strontium is the chemical element with symbol Sr and atomic number 38.

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Sun

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

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Supergiant star

Supergiants are among the most massive and most luminous stars.

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SV Vulpeculae

SV Vulpeculae is a Classical Cepheid (δ Cepheid) variable star in the constellation Vulpecula.

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Tau Boötis

Tau Boötis, Latinized from τ Boötis, is an F-type main-sequence star approximately 51 light-years away in the constellation of Boötes.

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Tau Herculis

Tau Herculis, Latinized from τ Herculis, is a fourth-magnitude star in the constellation Hercules.

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Theta Boötis

Theta Boötis (θ Boo, θ Boötis) is a star in the constellation Boötes.

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Theta Draconis

Theta Draconis (θ Dra / θ Draconis) is a fourth-magnitude star in the northern circumpolar constellation of Draco.

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Theta Ophiuchi

Theta Ophiuchi (θ Oph, θ Ophiuchi) is a multiple star system in the equatorial constellation of Ophiuchus.

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Theta2 Orionis

Theta2 Orionis (θ2 Ori) is a multiple star system in the constellation Orion.

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Titanium

Titanium is a chemical element with symbol Ti and atomic number 22.

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Titanium oxide

Titanium oxide may refer to.

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Upsilon Andromedae

Upsilon Andromedae (υ Andromedae, abbreviated Upsilon And, υ And) is a binary star located approximately 44 light-years from Earth in the constellation of Andromeda.

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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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Virial theorem

In mechanics, the virial theorem provides a general equation that relates the average over time of the total kinetic energy, \left\langle T \right\rangle, of a stable system consisting of N particles, bound by potential forces, with that of the total potential energy, \left\langle V_\text \right\rangle, where angle brackets represent the average over time of the enclosed quantity.

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Zeta Cassiopeiae

Zeta Cassiopeiae (ζ Cassiopeiae, abbreviated Zet Cas, ζ Cas), also named Fulu, is a variable star in the constellation of Cassiopeia.

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Zeta Herculis

Zeta Herculis (ζ Her, ζ Herculis) is a multiple star system in the constellation Hercules.

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Zeta Serpentis

Zeta Serpentis, Latinized from ζ Serpentis, is the Bayer designation for a single, yellow-white hued star in the equatorial constellation of Serpens.

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110 Herculis

No description.

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31 Comae Berenices

31 Comae Berenices (31 Com) is a yellow giant star in the constellation Coma Berenices.

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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:

Blue subgiant star, Orange subgiant, Sub-giant, Subgiant branch, Subgiant star, Yellow subgiant.

References

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

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