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) » « Shrink index
Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.
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.
Alpha Centauri (α Centauri, abbreviated Alf Cen or α Cen) is the star system closest to the Solar System, being from the Sun.
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.
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).
Beta Aquilae, Latinized from β Aquilae (abbreviated Beta Aql or β Aql) is a binary star in the equatorial constellation of Aquila.
Beta Aurigae (β Aurigae, abbreviated Beta Aur, β Aur), also named Menkalinan, is a binary star system in the northern constellation of Auriga.
Beta Cassiopeiae (β Cassiopeiae, abbreviated Beta Cas or β Cas), also named Caph, is a Delta Scuti variable star in the constellation of Cassiopeia.
Beta Cephei (β Cephei, abbreviated Beta Cep, β Cep), also named Alfirk, is a third magnitude star in the constellation of Cepheus.
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.
Beta Scorpii (β Scorpii, abbreviated Beta Sco, β Sco) is a multiple star system in the southern zodiac constellation of Scorpius.
Beta Serpentis, Latinized from β Serpentis, is a binary star system in the constellation Serpens, in its head (Serpens Caput).
Calcium is a chemical element with symbol Ca and atomic number 20.
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.
Classical Cepheids (also known as Population I Cepheids, Type I Cepheids, or Delta Cephei variables) are a type of Cepheid variable star.
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.
Convective overshoot is a phenomenon of convection carrying material beyond an unstable region of the atmosphere into a stratified, stable region.
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.
Delta Geminorum (δ Geminorum, abbreviated Delta Gem, δ Gem), also named Wasat, is a triple star system in the constellation of Gemini.
Delta Herculis (δ Herculis, abbreviated Delta Her, δ Her) is a multiple star system in the constellation of Hercules.
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.
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.
Eta Boötis (η Boötis, abbreviated Eta Boo, η Boo) is a binary star in the constellation of Boötes.
Eta Cephei (η Cep, η Cephei) is a star in the northern circumpolar constellation of Cepheus.
Eta Ursae Majoris (η Ursae Majoris, abbreviated Eta UMa, η UMa), also named Alkaid, is a star in the constellation of Ursa Major.
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.
Gamma Cassiopeiae, Latinized from γ Cassiopeiae, is a star at the center of the distinctive "W" asterism in the northern circumpolar constellation of Cassiopeia.
Gamma Cephei (γ Cephei, abbreviated Gamma Cep, γ Cep) is a binary star system approximately 45 light-years away in the constellation of Cepheus.
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.
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).
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
HD 224693 b is an extrasolar planet orbiting the star HD 224693 every 27 days with a minimum mass 71% of Jupiter.
The Hertzsprung Gap is a feature of the Hertzsprung–Russell diagram for a star cluster.
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.
Hydrogen is a chemical element with symbol H and atomic number 1.
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.
Iota Herculis (ι Her, ι Herculis) is a fourth-magnitude variable star in the constellation Hercules.
Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.
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.
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.
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.
Magnesium is a chemical element with symbol Mg and atomic number 12.
In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.
Messier 67 (also known as M67 or NGC 2682) is an open cluster in the constellation of Cancer.
Mu Cancri (μ Cancri, μ Cnc, Mu Cnc) is the name of several stars.
Mu Herculis (μ Herculis) is a nearby star system about 27.1 light years from Earth in the constellation Hercules.
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.
Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus.
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.
Pi Scorpii (π Scorpii, abbreviated Pi Sco, π Sco) is a triple star system in the southern constellation of Scorpius.
Procyon, also designated Alpha Canis Minoris (α Canis Minoris, abbreviated Alpha CMi, α CMi), is the brightest star in the constellation of Canis Minor.
A red dwarf (or M dwarf) is a small and relatively cool star on the main sequence, of M spectral type.
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.
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.
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.
In stellar astrophysics, the Schönberg–Chandrasekhar limit is the maximum mass of a non-fusing, isothermal core that can support an enclosing envelope.
Sirius (a romanization of Greek Σείριος, Seirios,."glowing" or "scorching") is a star system and the brightest star in the Earth's night sky.
A slowly pulsating B-type star (SPB), formerly known as a 53 Persei variable, is a type of pulsating variable star.
Spectral line shape describes the form of a feature, observed in spectroscopy, corresponding to an energy change in an atom, molecule or ion.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
Stellar evolution is the process by which a star changes over the course of time.
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.
Strontium is the chemical element with symbol Sr and atomic number 38.
The Sun is the star at the center of the Solar System.
Supergiants are among the most massive and most luminous stars.
SV Vulpeculae is a Classical Cepheid (δ Cepheid) variable star in the constellation Vulpecula.
Tau Boötis, Latinized from τ Boötis, is an F-type main-sequence star approximately 51 light-years away in the constellation of Boötes.
Tau Herculis, Latinized from τ Herculis, is a fourth-magnitude star in the constellation Hercules.
Theta Boötis (θ Boo, θ Boötis) is a star in the constellation Boötes.
Theta Draconis (θ Dra / θ Draconis) is a fourth-magnitude star in the northern circumpolar constellation of Draco.
Theta Ophiuchi (θ Oph, θ Ophiuchi) is a multiple star system in the equatorial constellation of Ophiuchus.
Theta2 Orionis (θ2 Ori) is a multiple star system in the constellation Orion.
Titanium is a chemical element with symbol Ti and atomic number 22.
Titanium oxide may refer to.
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.
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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.
Zeta Cassiopeiae (ζ Cassiopeiae, abbreviated Zet Cas, ζ Cas), also named Fulu, is a variable star in the constellation of Cassiopeia.
Zeta Herculis (ζ Her, ζ Herculis) is a multiple star system in the constellation Hercules.
Zeta Serpentis, Latinized from ζ Serpentis, is the Bayer designation for a single, yellow-white hued star in the equatorial constellation of Serpens.
31 Comae Berenices (31 Com) is a yellow giant star in the constellation Coma Berenices.
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.