Ap star | has definition Stars can be classified according to their surface temperatures, which determine, in large part, the spectrum of radiation they emit. A stars have surface temperatures between about 7,500 and 11,000 degrees centigrade. Peculiar A stars are A stars whose emitted radiation spectra have many of the characteristics of A stars but are peculiar in certain ways. | ![has source: Lightman, A., Brawer, R. 1990 The Lives and Worlds of Modern Cosmologists, Harvard University Press, 2001-09-27 09:30:46.0 has source: Lightman, A., Brawer, R. 1990 The Lives and Worlds of Modern Cosmologists, Harvard University Press, 2001-09-27 09:30:46.0](facet.gif) |
has definition Star with spectral type A in which the lines of one or several elements are abnormally enhanced. Traditionally the most important subgroups are Si λ4200, Hg-Mn and Cr-Eu-Sr stars. The latest objects of the latter group correspond to early F-type. | ![has source: Jaschek, C., Jaschek, M. 1995 The Behavior of Chemical Elements in Stars, Cambridge University Press, 2001-09-27 09:30:46.0 has source: Jaschek, C., Jaschek, M. 1995 The Behavior of Chemical Elements in Stars, Cambridge University Press, 2001-09-27 09:30:46.0](facet.gif) |
has definition Peculiar A-type stars ("magnetic" A stars) that show abnormally strong lines, sometimes of varying intensity, of certain ionized metals. Recent evidence indicates that all Ap stars are slow rotators compared with normal A stars. | ![has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:30:46.0 has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:30:46.0](facet.gif) |
is a kind of peculiar star | ![2001-09-27 09:30:46.0 2001-09-27 09:30:46.0](facet.gif) |
is a kind of A star | ![2001-09-27 09:30:46.0 2001-09-27 09:30:46.0](facet.gif) |
A star | has color white | ![2001-09-27 09:30:46.0 2001-09-27 09:30:46.0](facet.gif) |
has surface temperature 10000 K | ![2001-09-27 09:30:46.0 2001-09-27 09:30:46.0](facet.gif) |
has absorption line H I | ![2001-09-27 09:30:46.0 2001-09-27 09:30:46.0](facet.gif) |
early star | has spectral type O, B, A, and early F | ![2001-09-27 09:30:44.0 2001-09-27 09:30:44.0](facet.gif) |
star | has star surface temperature | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has V magnitude | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has B magnitude | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has U magnitude | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has position on celestial sphere from the point of view of Earth | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has parallax from the point of view of Earth's orbit | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has proper motion | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has radiation at surface which is diffused out from the hotter core | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has energy source gravitational contraction and or fusion | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has energy production which takes place primarily within the core | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has surface density which depends on luminosity class | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has apparent magnitude | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has absolute magnitude | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has age | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has catalog star catalog | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has material hydrogen, helium | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
has velocity determined from proper motion and radial velocity | ![2001-09-27 09:30:25.0 2001-09-27 09:30:25.0](facet.gif) |
has mass greater than 0.08 the sun's mass | ![2001-09-27 09:30:24.0 2001-09-27 09:30:24.0](facet.gif) |
celestial body | has spectra | ![2001-09-27 09:30:09.0 2001-09-27 09:30:09.0](facet.gif) |
physical object | has location or center of gravity | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has angular momentum | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has momentum | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has temperature | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has volume | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has extent | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |