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physical object > natural object > celestial body > star > dwarf > brown dwarf |
brown dwarf | ||||
subject | fact |
brown dwarf | has mass 1 to 8 percent of the Sun | |
has definition Star with too little mass to ignite its hydrogen 1 fuel. If brown dwarfs exist, they shine faint red for a time, as they convert gravitational energy into heat, and then fade and cool. | ||
has definition A substellar object that is below the minimum mass required for nuclear fusion reactions to occur in its core. | ||
has definition A self-gravitating, self-luminous gaseous object which is not sufficiently massive to result in thermonuclear hydrogen fusion reactions in its core and cannot therefore be considered a star. Such objects are expected to have a mass less than 7% of the Sun's mass and represent a "missing link" between low-mass stars and gas giant planets like Jupiter (at 0.1% of the Sun's mass). | ||
is a kind of dwarf | ||
is a kind of massive compact halo object | ||
dwarf | has symbol d | |
has luminosity class V | ||
has synonym main sequence star | ||
massive compact halo object | is a part of halo | |
has acronym MACHO | ||
star | has star surface temperature | |
has spectral type | ||
has V magnitude | ||
has B magnitude | ||
has U magnitude | ||
has position on celestial sphere from the point of view of Earth | ||
has parallax from the point of view of Earth's orbit | ||
has proper motion | ||
has radiation at surface which is diffused out from the hotter core | ||
has energy source gravitational contraction and or fusion | ||
has energy production which takes place primarily within the core | ||
has surface density which depends on luminosity class | ||
has surface temperature greater than 1000 Kelvin | ||
has apparent magnitude | ||
has absolute magnitude | ||
has age | ||
has catalog star catalog | ||
has material hydrogen, helium | ||
has velocity determined from proper motion and radial velocity | ||
dark matter | is a part of dark halo | |
celestial body | has spectra | |
hypothetical particle | has acceptance status hypothetical | |
particle | obeys uncertainty principle | |
has frequency inversely proportional to the wavelength | ||
has wavelength inversely proportional to its momentum | ||
has charge | ||
physical object | has location or center of gravity | |
has angular momentum | ||
has momentum | ||
has temperature | ||
has volume | ||
has extent |
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