| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
|---|---|---|---|---|
| hadron barrier (hadronBarrier) | ||||
|
hadron barrier |
Big Bang theory | |||
| hadron (hadron) | ||||
|
hadron |
elementary particle | boson | ||
| hafnium (hafnium) | ||||
|
hafnium (atomic number 72) |
Hf | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| halation (halation) | ||||
|
halation |
image
, photographic emulsion , turbidity |
|||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| half-wave dipole (halfWaveDipole) | ||||
|
half-wave dipole |
half wave dipole
, halfwave dipole |
dipole |
Yagi antenna
, radio telescope |
|
| half-wave plate (halfWavePlate) | ||||
|
half-wave plate |
half wave plate
, halfwave plate |
plane polarization
, quarter wave plate |
||
| FVH: new (2007-SEP-21) | ||||
| halo (halo) | ||||
|
halo |
Galactic halo |
comet
, corona , galaxy , galaxy structure , halo star , light scattering |
||
| halo star (haloStar) | ||||
|
halo star |
population II star
, population III star , star |
Galactic halo
, globular star cluster , halo , stellar population |
||
| H alpha (HAlpha) | ||||
|
H alpha (656 nm) |
Balmer series
, resonance line |
H alpha emission line star
, H alpha photometry |
||
| H alpha emission line star (HAlphaEmissionLineStar) | ||||
|
h alpha emission line star |
H alpha
, RW Aurigae star , T association , variable star |
|||
| H alpha photometry (HAlphaPhotometry) | ||||
|
h alpha photometry |
narrow band photometry | H alpha | ||
| H and K line (HAndKLine) | ||||
|
H and K line |
calcium line |
H line
, K line |
||
| Hanle effect (HanleEffect) | ||||
|
Hanle effect |
Sun
, prominence |
|||
| Harman-Seaton sequence (HarmanSeatonSequence) | ||||
|
Harman-Seaton sequence |
Harman Seaton sequence |
Hertzsprung-Russell diagram
, planetary nebula , subdwarf |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| harmonic frequency (harmonicFrequency) | ||||
|
harmonic frequency |
harmonic overtones
, harmonics |
Fourier analysis
, Fourier component , fundamental frequency , overtone frequency |
||
| refers only to Fourier component of non-sinusoidal wave; see also overtone frequency | ||||
| Haro galaxy (HaroGalaxy) | ||||
|
Haro galaxy |
galaxy | emission line galaxy | ||
| Hartmann test (HartmannTest) | ||||
|
Hartmann test |
figuring
, image , optical instrument |
|||
| hassium (hassium) | ||||
|
hassium (atomic number 108) |
Hs | fundamental chemical element | ||
| FVH: new (2007-OCT-25) | ||||
| Hawking radiation (HawkingRadiation) | ||||
|
Hawking radiation |
black hole
, event horizon |
|||
| Hayashi track (HayashiTrack) | ||||
|
Hayashi track |
evolutionary track |
Hertzsprung-Russell diagram
, convection |
||
| H beta (HBeta) | ||||
|
H beta (486 nm) |
Balmer series | H beta photometry | ||
| H beta photometry (HBetaPhotometry) | ||||
|
h beta photometry |
narrow band photometry |
H beta
, Stromgren photometry |
||
| HD curve (HdCurve) | ||||
|
HD curve |
photography | |||
| Hurter and Driffield curve | ||||
| H delta (HDelta) | ||||
|
H delta (410 nm) |
Balmer series | |||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| head tail galaxy (headTailGalaxy) | ||||
|
head tail galaxy |
galaxy
, radio galaxy , radio source |
radio structure
, tail |
||
| heat-transfer (heatTransfer) | ||||
|
heat transfer |
energy-transfer | |||
| heavy element (heavyElement) | ||||
|
heavy element |
chemical element | abundance | ||
| heavy metal star (heavyMetalStar) | ||||
|
heavy metal star |
late-type giant
, peculiar star |
S star
, barium star , zirconium star |
||
| He I (HeI) | ||||
|
neutral helium |
helium
, neutral gas |
|||
| height (height) | ||||
|
altitude [height] |
elevation | |||
| use altitude [angle] for angle | ||||
| He II (HeIi) | ||||
|
once-ionized helium |
helium | |||
| He III (HeIii) | ||||
|
twice-ionized helium |
helium | |||
| He II ionization zone (HeIiIonizationZone) | ||||
|
He II ionization zone |
He+ ionisation zone UK
, He+ ionization zone |
Cepheid
, ZZ Ceti star , delta Scuti star , kappa mechanism , pulsating variable star , pulsation theory , radial pulsation , variable star |
||
| FVH: replaced + with II for better parsing of token (2007-OCT-12) | ||||
| heliocentric correction (heliocentricCorrection) | ||||
|
heliocentric correction |
Astronomical Unit
, coordinate system , heliocentric Julian Date , heliocentric velocity |
|||
| correction of velocity and times to the Sun's position | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| heliocentric Julian Date (heliocentricJulianDate) | ||||
|
heliocentric Julian Date |
H.J.D.
, HJD |
Julian Date | heliocentric correction | |
| heliocentric orbit (heliocentricOrbit) | ||||
|
heliocentric orbit |
orbit | |||
| heliocentric velocity (heliocentricVelocity) | ||||
|
heliocentric velocity |
velocity | heliocentric correction | ||
| heliograph (heliograph) | ||||
|
heliograph |
||||
| heliometer (heliometer) | ||||
|
heliometer |
measuring instrument | |||
| heliopause (heliopause) | ||||
|
heliopause |
solar atmosphere
, solar wind |
|||
| helioseismology (helioseismology) | ||||
|
helioseismology |
solar seismology |
asteroseismology
, seismology |
solar oscillation | |
| heliosphere (heliosphere) | ||||
|
heliosphere |
interplanetary matter
, interstellar gas , solar activity , solar atmosphere , solar wind |
|||
| heliostat (heliostat) | ||||
|
heliostat |
coelostat |
siderostat
, solar telescope , telescope mounting |
||
| helium burning (heliumBurning) | ||||
|
helium burning |
nuclear fusion
, nucleosynthesis |
carbon burning
, helium flash , helium shell flash , hydrogen burning , inner core , oxygen burning , shell burning , silicon burning , stellar evolution , stellar interior |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| helium flash (heliumFlash) | ||||
|
helium flash |
helium detonation |
carbon flash
, helium burning , helium shell flash , nuclear fusion , red giant tip |
||
| helium (helium) | ||||
|
helium (atomic number 2) |
He | fundamental chemical element |
He I
, He II , He III |
|
| FVH: new (2007-OCT-25) | ||||
| helium-poor star (heliumPoorStar) | ||||
|
helium-poor star |
helium poor star | star | Bw star |
abundance
, metal abundance |
| helium-rich star (heliumRichStar) | ||||
|
helium-rich star |
helium rich star | star | DB star |
abundance
, metal abundance |
| FVH: added NT DB_STARS (2007-OCT-1) | ||||
| helium shell flash (heliumShellFlash) | ||||
|
helium shell flash |
helium burning
, helium flash , nuclear fusion |
|||
| Helmholtz-Kelvin contraction (HelmholtzKelvinContraction) | ||||
|
Helmholtz-Kelvin contraction |
Helmholtz Kelvin contraction
, Kelvin-Helmholtz contraction |
Kelvin timescale | ||
| Henry Draper catalog (HenryDraperCatalog) | ||||
|
henry draper catalog |
catalog |
Henry Draper system
, spectral classification |
||
| Henry Draper system (HenryDraperSystem) | ||||
|
Henry-Draper system |
HD system
, Harvard classification |
spectral classification | Henry Draper catalog | |
| Henyey track (HenyeyTrack) | ||||
|
Henyey track |
evolutionary track |
Hertzsprung-Russell diagram
, stellar evolution |
||
| H epsilon (HEpsilon) | ||||
|
H epsilon |
Balmer series | |||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| Herbig AeBe star (HerbigAeBeStar) | ||||
|
Herbig AeBe star |
Herbig Ae-Be star
, Herbig star |
Ae star
, Be star |
Ae star
, Be star |
|
| Herbig-Haro object (HerbigHaroObject) | ||||
|
Herbig-Haro object |
HH-object |
emission line object
, emission nebula , infrared source , intrinsic variable star , pre-main sequence star |
T association
, T Tauri star , protostar |
|
| Hertzsprung gap (HertzsprungGap) | ||||
|
Hertzsprung gap |
Hertzsprung-Russell diagram
, giant branch |
|||
| Hertzsprung-Russell diagram (HertzsprungRussellDiagram) | ||||
|
Hertzsprung-Russell diagram |
HR diagram
, Hertzsprung Russell diagram |
Harman-Seaton sequence
, Hayashi track , Henyey track , Hertzsprung gap , Hess diagram , absolute magnitude , asymptotic giant branch , color-luminosity relation , color-magnitude relation , evolutionary track , giant branch , instability strip , luminosity , main sequence , post-asymptotic giant branch , red giant tip , spectrum , stellar evolution , turnoff point , zero-age horizontal branch , zero-age main sequence |
||
| Hess diagram (HessDiagram) | ||||
|
Hess diagram |
Hertzsprung-Russell diagram
, frequency distribution |
|||
| heterodyne (heterodyne) | ||||
|
heterodyne |
interferometer
, spectroscopy |
|||
| combine with other terms | ||||
| H gamma (HGamma) | ||||
|
H gamma (434 nm) |
Balmer series | |||
| H I (HI) | ||||
|
H I |
neutral hydrogen |
hydrogen
, neutral gas |
21-cm line
, H I absorption , H I cloud , H I content , H I emission , H I region |
|
| H I absorption (HIAbsorption) | ||||
|
H I absorption |
21-cm line
, H I , H I cloud |
|||
| Hickson compact group (HicksonCompactGroup) | ||||
|
Hickson compact group of galaxies |
HCG | galaxy group | ||
| FVH: new (2007-OCT-8) | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| H I cloud (HICloud) | ||||
|
H I cloud |
21-cm line
, H I , H I absorption |
|||
| H I content (HIContent) | ||||
|
H I content |
21-cm line
, H I |
|||
| H I emission (HIEmission) | ||||
|
H I emission |
21-cm line
, H I , emission spectrum |
|||
| hierarchical cosmology (hierarchicalCosmology) | ||||
|
hierarchical cosmology |
cosmology | |||
| high-energy astrophysics (highEnergyAstrophysics) | ||||
|
high-energy astrophysics |
high energy astrophysics
, high energy process , high-energy process |
astrophysics |
cosmic ray astronomy
, inverse Compton effect , nuclear astrophysics , particle beam |
|
| high-energy radiation (highEnergyRadiation) | ||||
|
high-energy radiation |
high energy radiation | radiation |
X-ray radiation
, cosmic ray , gamma-ray radiation |
X-ray luminosity |
| high-luminosity star (highLuminosityStar) | ||||
|
high-luminosity star |
high luminosity star
, luminous star |
star |
bright star
, luminous blue variable star , nova , supergiant , supernova |
|
| high-mass star (highMassStar) | ||||
|
high-mass star |
star | high-mass X-ray binary star | ||
| FVH: new (2007-OCT-9) | ||||
| high-mass X-ray binary star (highMassXRayBinaryStar) | ||||
|
high-mass X-ray binary star |
X-ray binary star
, high-mass star |
low-mass X-ray binary star | ||
| ES: new (2007-OCT-8) | ||||
| high-resolution spectrosopy (highResolutionSpectrosopy) | ||||
|
high-resolution spectrosopy |
high dispersion spectroscopy
, high resolution spectrosopy , high-dispersion spectroscopy |
spectroscopy |
Coude spectrograph
, echelle spectrograph |
|
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| high-resolution spectrum (highResolutionSpectrum) | ||||
|
high-resolution spectrum |
high dispersion spectrum
, high resolution spectrum , high-dispersion spectrum |
Coude spectrum
, echelle spectrum |
Coude spectrograph
, echelle spectrograph |
|
| high-speed photometer (highSpeedPhotometer) | ||||
|
high-speed photometer |
high speed photometer | photometer |
time-resolved spectroscopy
, variable star |
|
| high-state (highState) | ||||
|
photometric high state of variable object |
low-state
, outburst , variability , variable source |
|||
| FVH: new (2007-OCT-8) | ||||
| high-temperature (highTemperature) | ||||
|
high-temperature |
high temperature
, hot |
|||
| combine with other terms | ||||
| high-velocity cloud (highVelocityCloud) | ||||
|
high-velocity cloud |
HVC
, high velocity cloud |
cloud |
Galactic rotation
, Milky Way galaxy , high-velocity star , velocity |
|
| FVH: added ALT HVC (2007-SEP-21) | ||||
| high-velocity star (highVelocityStar) | ||||
|
high-velocity star |
high velocity star | star |
Galactic rotation
, Milky Way galaxy , high-velocity cloud , orbit , runaway star , velocity |
|
| H II (HIi) | ||||
|
H II |
ionized hydrogen |
hydrogen
, ionized gas |
H II region | |
| H II region (HIiRegion) | ||||
|
H II region |
HII region |
emission line object
, emission nebula , interstellar matter |
compact H II region |
Bok globule
, Faraday effect , H II , cometary globule , emission line galaxy , emission line , exciting star , plasma , radio recombination line , young star |
| Hirayama family (HirayamaFamily) | ||||
|
Hirayama family |
minor planet family | Apollo group | ||
| H I region (HIRegion) | ||||
|
H I region |
interstellar matter |
21-cm line
, H I , neutral gas , radio absorption , radio recombination line |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| history of astronomy (historyOfAstronomy) | ||||
|
history of astronomy |
archaeoastronomy | |||
| combine with other terms | ||||
| H line (HLine) | ||||
|
H line |
Fraunhofer line
, H and K line |
K line | ||
| H magnitude (HMagnitude) | ||||
|
H magnitude |
apparent magnitude |
infrared photometry
, near infrared radiation |
||
| Holmberg radius (HolmbergRadius) | ||||
|
Holmberg radius |
galaxy | |||
| holmium (holmium) | ||||
|
holmium (atomic number 67) |
Ho |
fundamental chemical element
, rare earth |
holmium star | |
| FVH: new (2007-OCT-25) | ||||
| holmium star (holmiumStar) | ||||
|
holmium star |
Ap star
, peculiar star |
holmium | ||
| Holtsmark approximation (HoltsmarkApproximation) | ||||
|
Holtsmark approximation |
plasma | |||
| horizon coordinate system (horizonCoordinateSystem) | ||||
|
horizon coordinate system |
coordinate system |
altazimuth mounting
, altitude angle , azimuth , horizon , meridian , nadir , zenith |
||
| horizon (horizon) | ||||
|
horizon |
altitude angle
, azimuth , celestial sphere , horizon coordinate system |
|||
| horizontal branch star (horizontalBranchStar) | ||||
|
horizontal branch star |
evolved star
, population II star |
extreme horizontal branch star |
RR Lyrae star
, giant branch star , globular star cluster |
|
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| horizontal parallax (horizontalParallax) | ||||
|
horizontal parallax |
diurnal parallax | |||
| horn antenna (hornAntenna) | ||||
|
horn antenna |
horn antennas |
antenna
, radio waveguide |
feed horn | |
| horseshoe mounting (horseshoeMounting) | ||||
|
horseshoe mounting |
equatorial mounting | |||
| hour angle (hourAngle) | ||||
|
hour angle |
HA |
Right Ascension
, sidereal time , transit time |
||
| HST photometry (HstPhotometry) | ||||
|
HST photometry |
HST Fnnn[LMNW] photometry
, Hubble photometry |
broad band photometry
, photometric system |
Hubble Space Telescope | |
| FVH: new (2007-SEP-21) | ||||
| Hubble classification (HubbleClassification) | ||||
|
Hubble classification |
Hubble sequence | galaxy | ||
| Hubble constant (HubbleConstant) | ||||
|
Hubble constant |
cosmological parameter |
Hubble time
, cosmological distance scale , cosmology , redshift magnitude relation |
||
| Hubble diagram (HubbleDiagram) | ||||
|
Hubble diagram |
statistical relation |
cosmology
, galaxy , redshift , redshift magnitude relation |
||
| Hubble law (HubbleLaw) | ||||
|
Hubble law |
statistical relation |
Dark Energy
, cosmology , observational cosmology , redshift , redshift magnitude relation |
||
| Hubble radius (HubbleRadius) | ||||
|
Hubble radius |
Big Bang theory
, cosmology |
|||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| Hubble Sandage variable star (HubbleSandageVariableStar) | ||||
|
Hubble-Sandage variable star |
H S variable star
, H-S variable star |
supergiant | ||
| Hubble Space Telescope (HubbleSpaceTelescope) | ||||
|
Hubble Space Telescope |
HST |
optical observatory
, space observatory , ultraviolet observatory |
HST photometry | |
| FVH: new, because of HST_photometry (2007-NOV-1) | ||||
| Hubble time (HubbleTime) | ||||
|
Hubble time |
Big Bang theory
, Hubble constant , age , cosmology |
|||
| hydrated carbon (hydratedCarbon) | ||||
|
CH molecule |
CH |
carbon compound
, hydrocarbon , interstellar molecule , molecule |
||
| FVH: moved CH to ALT to conform to standard use in the thesaurus (2007-OCT-5) | ||||
| hydrocarbon (hydrocarbon) | ||||
|
hydrocarbon |
CS
, ethane , ethylene , hydrated carbon , polycyclic hydrocarbon |
|||
| hydrodynamics (hydrodynamics) | ||||
|
hydrodynamics |
fluid dynamics |
jet
, magnetohydrodynamics |
||
| hydrogen burning (hydrogenBurning) | ||||
|
hydrogen burning |
nucleosynthesis |
carbon nitrogen cycle
, proton-proton reaction |
Chandrasekhar mass
, Chandrasekhar-Schoenberg limit , carbon burning , helium burning , hydrogen , inner core , nuclear fusion , oxygen burning , shell burning , silicon burning , stellar evolution , stellar interior |
|
| hydrogen deficient star (hydrogenDeficientStar) | ||||
|
hydrogen-deficient star |
star | AM Canum Venaticorum star |
hydrogen
, metal abundance |
|
| hydrogen (hydrogen) | ||||
|
hydrogen (atomic number 1) |
H | fundamental chemical element |
H I
, H II , deuterium , molecular hydrogen , negative H ion , tritium |
21-cm line
, hydrogen burning , hydrogen deficient star , hydrogen spectrum |
| FVH: new (2007-OCT-25) | ||||
| hydrogen line (hydrogenLine) | ||||
|
hydrogen line |
||||
| see hydrogen spectrum | ||||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |
| hydrogen spectrum (hydrogenSpectrum) | ||||
|
hydrogen spectrum |
spectrum |
Balmer continuum
, Balmer series , Brackett series , Lyman continuum , Lyman series , Paschen series , Pfund series |
hydrogen | |
| hydrostatic equilibrium (hydrostaticEquilibrium) | ||||
|
hydrostatic equilibrium |
stellar structure | |||
| hydroxyl radical (hydroxylRadical) | ||||
|
hydroxyl radical |
OH
, OH radical |
interstellar molecule
, ion , radical |
OH absorption
, OH cloud , OH emission , OH IR star , OH line , OH maser , OH source |
|
| hyperbolic orbit (hyperbolicOrbit) | ||||
|
hyperbolic orbit |
orbit |
circular orbit
, elliptical orbit , parabolic orbit |
||
| hyperfine line (hyperfineLine) | ||||
|
hyperfine line |
spectral line | spectrum | ||
| hypergalaxy (hypergalaxy) | ||||
|
hypergalaxy |
galaxy | |||
| hypergiant (hypergiant) | ||||
|
hypergiant star |
star | supergiant | ||
| hypernova (hypernova) | ||||
|
hypernova |
supernova |
gamma-ray burst
, stellar black hole |
||
| FVH: new (2007-OCT-5) | ||||
| hypothetical planet (hypotheticalPlanet) | ||||
|
hypothetical planet |
planet | |||
| HZ Herculis star (HzHerculisStar) | ||||
|
HZ Herculis star |
X-ray pulsar
, low-mass star , neutron star |
X-ray binary star
, X-ray burst |
||
| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | ||||
| Description | alt | broader | narrower | related |