Fr.: étoile forte en hélium
An early → B-type star showing helium lines with abnormally large equivalent widths. The surface → chemical abundances of He-strong stars are influenced by the presence of a strong → magnetic field, resulting in a He overabundance that typically varies in strength over the stellar surface. Examples include HR 735, HD 184927, and CPD-62°2124.
sotorg, zurmand, nirumand (#)
Fr.: fort, puissant
Having an intense, powerful, or vivid effect.
O.E. strang "physically powerful, powerful in effect, forceful;" cf. O.N. strangr "strong," Du. streng "strict, rigorous," O.H.G. strang "strong, bold, hard," Ger. streng "strict, rigorous."
Sotorg "large, strong," Mid.Pers. sturg "fierce; gross, coarse,"
Av. stūra- "strong, large, rough," stāuuišta- "strongest, biggest,"
cf. Skt. sthūrá- "strong, big, massy, thick,"
Gk. stylos "column, pillar," M.L.G. stūr "big, strong, coarse."
strong anthropic principle
parvaz-e ensân-hasti-ye sotorg
Fr.: principe anthropique fort
A version of the → anthropic principle that claims that the → Universe must be suitable for the formation of → intelligent life at some point. Compared with the → weak anthropic principle, this version is very controversial. Its implications are highly speculative from a scientific viewpoint.
strong arm spiral galaxy
kahkešân-e mârpic bâ bâzu-ye setorg
Fr.: galaxie spirale à forts bras
A galaxy with prominent stellar → spiral arms and little star formation between stellar arms, such as M51.
Fr.: rencontre proche
In a star cluster, a → close encounter that strongly changes a star's velocity.
Fr.: interaction forte
The force responsible for holding quarks and gluons together to form protons, neutrons and other particles. It is the strongest of the four fundamental forces. Same as → strong interaction.
strong gravitational lensing
lenzeš-e gerâneši-ye sotorg
Fr.: effet de lentille gravitationnelle forte
A → gravitational lensing phenomenon in which the image distortion is strong enough to be readily recognized, such as in the case of the → Einstein cross or when giant luminous arcs show up in → galaxy clusters (e.g. Abell 2218). Opposite to → weak gravitational lensing.
→ strong; → gravitational; → lensing.
Fr.: interaction forte
The interaction between quarks that is transmitted by gluons. The characteristic range of the strong interaction is 10-13 cm, and the time scale over which it operates is on the order of 10-23 second. Also called → strong force.
→ strong; → interaction.
Fr.: effet de lentille fort
A situation where the mass concentration in the central regions of → galaxy clusters exceeds the → critical density required for lensing, resulting in multiple images of background objects.