33 relations: Accretion disk, American Astronomical Society, Arlo U. Landolt, Asteroseismology, Asymptotic giant branch, Binary star, Carbon, Don Winget, Effective temperature, G 117-B15A, Galactic Disc, GD 358, General Catalogue of Variable Stars, Gravity wave, Helium, Hertzsprung–Russell diagram, HL Tau 76, Hydrogen, Instability strip, Kelvin, Luminosity, McDonald Observatory, Normal mode, Oxygen, PG 1159 star, PG 1159-035, Ross 548, Second, Spectral line, Star, The Astrophysical Journal, Variable star, White dwarf.
An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.
The American Astronomical Society (AAS, sometimes spoken as "double-A-S") is an American society of professional astronomers and other interested individuals, headquartered in Washington, DC.
Arlo Udell Landolt (born September 29, 1935) is an American astronomer.
Asteroseismology or astroseismology is the study of oscillations in stars.
The asymptotic giant branch (AGB) is a region of the Hertzsprung–Russell diagram populated by evolved cool luminous stars.
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.
Don Winget is the Harlan J. Smith Centennial Professor in Astronomy at the University of Texas.
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.
G117-B15A is a small, well-observed variable white dwarf star of the DAV, or ZZ Ceti, type in the constellation of Leo Minor.
The Galactic Disc is a component of disc galaxies, such as spiral galaxies and lenticular galaxies.
GD 358 is a variable white dwarf star of the DBV type.
The General Catalogue of Variable Stars (GCVS) is a list of variable stars.
In fluid dynamics, gravity waves are waves generated in a fluid medium or at the interface between two media when the force of gravity or buoyancy tries to restore equilibrium.
Helium (from lit) is a chemical element with symbol He and atomic number 2.
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.
HL Tau 76 is a variable white dwarf star of the DAV (or ZZ Ceti) type.
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.
The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
The McDonald Observatory is an astronomical observatory located near the unincorporated community of Fort Davis in Jeff Davis County, Texas, United States.
A normal mode of an oscillating system is a pattern of motion in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation.
Oxygen is a chemical element with symbol O and atomic number 8.
A PG 1159 star, often also called a pre-degenerate, is a star with a hydrogen-deficient atmosphere that is in transition between being the central star of a planetary nebula and being a hot white dwarf.
PG 1159-035 is the prototypical PG 1159 star after which the class of PG 1159 stars was named.
Ross 548 is a variable white dwarf star of the DAV type.
The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.
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.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
DAV star, DAV stars, DAV variable, DBV star, DBV stars, DBV variable, DOV star, DOV stars, DOV variable, DQV star, DQV stars, GW Vir star, GW Vir stars, GW Vir variable, GW Virginis star, GW Virginis stars, GW Virginis variable, PNNV, Pulsating white dwarfs, V777 Her star, V777 Her variable, V777 Herculis star, V777 Herculis variable, ZZ Cet star, ZZ Cet variable, ZZ Ceti objects, ZZ Ceti star, ZZ Ceti stars, ZZ Ceti variable, ZZ Ceti variables.