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Ap star
subjectfact 
Ap starhas 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 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 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
is a kind of peculiar star2001-09-27 09:30:46.0
is a kind of A star2001-09-27 09:30:46.0
A starhas color white2001-09-27 09:30:46.0
has surface temperature 10000 K2001-09-27 09:30:46.0
has absorption line H I2001-09-27 09:30:46.0
early starhas spectral type O, B, A, and early F2001-09-27 09:30:44.0
starhas star surface temperature2001-09-27 09:30:25.0
has V magnitude2001-09-27 09:30:25.0
has B magnitude2001-09-27 09:30:25.0
has U magnitude2001-09-27 09:30:25.0
has position on celestial sphere from the point of view of Earth2001-09-27 09:30:25.0
has parallax from the point of view of Earth's orbit2001-09-27 09:30:25.0
has proper motion2001-09-27 09:30:24.0
has radiation at surface which is diffused out from the hotter core2001-09-27 09:30:24.0
has energy source gravitational contraction and or fusion2001-09-27 09:30:24.0
has energy production which takes place primarily within the core2001-09-27 09:30:24.0
has surface density which depends on luminosity class2001-09-27 09:30:24.0
has apparent magnitude2001-09-27 09:30:25.0
has absolute magnitude2001-09-27 09:30:25.0
has age2001-09-27 09:30:25.0
has catalog star catalog2001-09-27 09:30:25.0
has material hydrogen, helium2001-09-27 09:30:24.0
has velocity determined from proper motion and radial velocity2001-09-27 09:30:25.0
has mass greater than 0.08 the sun's mass2001-09-27 09:30:24.0
celestial bodyhas spectra2001-09-27 09:30:09.0
physical objecthas location or center of gravity2001-09-27 09:27:27.0
has angular momentum2001-09-27 09:27:27.0
has momentum2001-09-27 09:27:27.0
has temperature2001-09-27 09:27:27.0
has volume2001-09-27 09:27:27.0
has extent2001-09-27 09:27:27.0

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