starspots

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• Starspot — Starspots are equivalent to sunspots but located on other stars. Spots the size of sunspots are very hard to detect since they are too small to cause fluctuations in brightness. Observed starspots are in general much larger than those on the Sun …   Wikipedia

• Doppler imaging — Not to be confused with Doppler ultrasound. Inhomogeneous structures on stellar surfaces, i.e. temperature differences, chemical composition or magnetic fields, create characteristic distortions in the spectral lines due to the Doppler effect.… …   Wikipedia

• Star — For other uses, see Star (disambiguation) …   Wikipedia

• Sunspot — A sunspot is a region on the Sun s surface (photosphere) that is marked by intense magnetic activity, which inhibits convection, forming areas of reduced surface temperature. They can be visible from Earth without the aid of a telescope. Although …   Wikipedia

• RS Canum Venaticorum variable — RS Canum Venaticorum variables are a type of variable star. They are close binary stars having active chromospheres which result in variations in their observed luminosity. The period of variations is, in general, close to the rotational period… …   Wikipedia

• Stellar magnetic field — A stellar magnetic field is a magnetic field generated by the motion of conductive plasma inside a main sequence (hydrogen burning) star. This motion is created through convection, which is a form of energy transport involving the physical… …   Wikipedia

• Cor Caroli — seen from northern England on March 1, 2011. Cor Caroli (α CVn, α Canum Venaticorum, Alpha Canum Venaticorum, originally known by the more elaborate Cor Caroli Regis Martyris) is the brightest star in the northern constellation Canes Venatici.… …   Wikipedia

• 12 Ophiuchi — Starbox begin name=12 Ophiuchi Starbox observe epoch=J2000 ra=RA|16|36|21.4493 dec=DEC| 02|19|28.501 appmag v=5.76 constell=Ophiuchus Starbox character class=K2 V b v=0.82 u b=0.50 variable=BY Draconis Starbox astrometry radial v= 15.4 prop mo ra …   Wikipedia

• Stellar rotation — is the angular motion of a star about its axis. The rate of rotation can be measured from the spectrum of the star, or by timing the movements of active features on the surface.The rotation of a star produces an equatorial bulge due to… …   Wikipedia

• star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …   Universalium

• 61 Cygni — Not be confused with 16 Cygni, a more distant system containing two G type stars harboring the gas giant planet 16 Cygni Bb. Starbox begin name=61 CygniStarbox image caption=Expanded view of the star field around 61 Cygni. This system is located… …   Wikipedia