58 relations: Asymptotic giant branch, Balmer series, Barium, Barium star, BD Camelopardalis, BH Crucis, Binary star, Carbon, Carbon monoxide, Carbon star, Chi Cygni, Convection, Dredge-up, Forsterite, Galactic Center, Galactic plane, Giant star, Helium flash, Hydrogen spectral series, Infrared excess, Iron, Lanthanum, Long-period variable star, Mass transfer, Mira variable, Omicron1 Orionis, Oxygen, Paul W. Merrill, Period 5 element, Pi1 Gruis, R Andromedae, R Cygni, R Geminorum, Red-giant branch, RR Andromedae, S-process, Semiregular variable star, Silicate, Silicon carbide, Slow irregular variable, Sodium, Spectral bands, Spectral line, Stellar classification, Stellar wind, Strontium, Symbiotic binary, Technetium, Technetium star, Titanium carbide, ..., Titanium dioxide, Titanium(II) oxide, Vanadium, W Aquilae, X Andromedae, Yttrium, Zirconium, Zirconium carbide. Expand index (8 more) » « Shrink index
The asymptotic giant branch (AGB) is a region of the Hertzsprung–Russell diagram populated by evolved cool luminous stars.
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.
Barium is a chemical element with symbol Ba and atomic number 56.
Barium stars are spectral class G to K giants, whose spectra indicate an overabundance of s-process elements by the presence of singly ionized barium, Ba II, at λ 455.4 nm.
BD Camelopardalis is an S star and symbiotic star in the constellation Camelopardalis.
BH Crucis, also known as Welch's Red Variable, is a star in the constellation Crux.
A binary star is a star system consisting of two stars orbiting around their common barycenter.
Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.
Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is slightly less dense than air.
A carbon star is typically an asymptotic giant branch star, a luminous red giant, whose atmosphere contains more carbon than oxygen; the two elements combine in the upper layers of the star, forming carbon monoxide, which consumes all the oxygen in the atmosphere, leaving carbon atoms free to form other carbon compounds, giving the star a "sooty" atmosphere and a strikingly ruby red appearance.
Chi Cygni (χ Cyg, χ Cygni) is a variable star of the Mira type in the constellation Cygnus, and also an S-type star.
Convection is the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock (rheid).
A dredge-up is a period in the evolution of a star where a surface convection zone extends down to the layers where material has undergone nuclear fusion.
Forsterite (Mg2SiO4; commonly abbreviated as Fo) is the magnesium-rich end-member of the olivine solid solution series.
The Galactic Center is the rotational center of the Milky Way.
The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies.
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 helium flash is a very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the triple-alpha process in the core of low mass stars (between 0.8 solar masses and 2.0) during their red giant phase (the Sun is predicted to experience a flash 1.2 billion years after it leaves the main sequence).
The emission spectrum of atomic hydrogen is divided into a number of spectral series, with wavelengths given by the Rydberg formula.
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.
Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.
Lanthanum is a chemical element with symbol La and atomic number 57.
The descriptive term long-period variable star refers to various groups of cool luminous pulsating variable stars.
Mass transfer is the net movement of mass from one location, usually meaning stream, phase, fraction or component, to another.
Mira variables ("Mira", Latin, adj. - feminine form of adjective "wonderful"), named for the prototype star Mira, are a class of pulsating variable stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths.
Omicron1 Orionis (ο1 Ori) is a binary star in the northeastern corner of the constellation Orion.
Oxygen is a chemical element with symbol O and atomic number 8.
Paul Willard Merrill (August 15, 1887 – July 19, 1961) was an American astronomer whose specialty was spectroscopy.
A period 5 element is one of the chemical elements in the fifth row (or period) of the periodic table of the elements.
π1 Gruis (Pi1 Gruis) is a semiregular variable star in the constellation Grus around 530 light-years from Earth.
R Andromedae (R And) is a Mira-type variable star in the constellation Andromeda.
R Cygni is a variable star of the Mira type in the constellation Cygnus.
R Geminorum (R Gem) is a Mira variable and technetium star in the constellation Gemini.
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.
RR Andromedae is a variable star in the constellation of Andromeda.
The slow neutron-capture process or s-process is a series of reactions in nuclear astrophysics that occur in stars, particularly AGB stars.
Semiregular variable stars are giants or supergiants of intermediate and late spectral type showing considerable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities.
In chemistry, a silicate is any member of a family of anions consisting of silicon and oxygen, usually with the general formula, where 0 ≤ x Silicate anions are often large polymeric molecules with an extense variety of structures, including chains and rings (as in polymeric metasilicate), double chains (as in, and sheets (as in. In geology and astronomy, the term silicate is used to mean silicate minerals, ionic solids with silicate anions; as well as rock types that consist predominantly of such minerals. In that context, the term also includes the non-ionic compound silicon dioxide (silica, quartz), which would correspond to x.
Silicon carbide (SiC), also known as carborundum, is a semiconductor containing silicon and carbon.
A slow irregular variable (ascribed the GCVS types L, LB and LC) is a variable star that exhibit no or very poorly defined periodicity in their slowly changing light emissions.
Sodium is a chemical element with symbol Na (from Latin natrium) and atomic number 11.
Spectral bands are part of optical spectra of polyatomic systems, including condensed materials, large molecules, etc.
A spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
A stellar wind is a flow of gas ejected from the upper atmosphere of a star.
Strontium is the chemical element with symbol Sr and atomic number 38.
A symbiotic binary is a type of binary star system, often simply called a symbiotic star.
Technetium is a chemical element with symbol Tc and atomic number 43.
A technetium star, or more properly a Tc-rich star, is a star whose stellar spectrum contains absorption lines of the light radioactive metal technetium.
Titanium carbide, TiC, is an extremely hard (Mohs 9–9.5) refractory ceramic material, similar to tungsten carbide.
Titanium dioxide, also known as titanium(IV) oxide or titania, is the naturally occurring oxide of titanium, chemical formula.
Titanium(II) oxide (TiO) is an inorganic chemical compound of titanium and oxygen.
Vanadium is a chemical element with symbol V and atomic number 23.
W Aquilae (W Aql / SAO 143184 / GC 2525) is a variable star in the constellation of Aquila.
X Andromedae is a variable star in the constellation of Andromeda.
Yttrium is a chemical element with symbol Y and atomic number 39.
Zirconium is a chemical element with symbol Zr and atomic number 40.
Zirconium carbide (ZrC) is an extremely hard refractory ceramic material, commercially used in tool bits for cutting tools.