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spectrum variable | ||||
subject | fact |
spectrum variable | has definition Main-sequence Am or Ap stars whose spectra show anomalously strong lines of metals and rare earths which vary in intensity by about 0.1 mag over periods of about 1-25 days. They are characterized by large magnetic fields (103-104 gauss) at the surface, small variations in light and color, and small projected rotational velocities. These peculiarities are sometimes interpreted in terms of an oblique rotator. | |
is a kind of star | ||
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 | ||
has mass greater than 0.08 the sun's mass | ||
celestial body | has spectra | |
physical object | has location or center of gravity | |
has angular momentum | ||
has momentum | ||
has temperature | ||
has volume | ||
has extent |
Kinds of spectrum variable :
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