A prefix meaning "before, prior to, in advance of, early, beforehand, in front of."
M.E., from O.Fr. pré-, from L. præ (adverb) "before."
Piš- "before; in front," from Mid.Pers. pêš "before, earlier," O.Pers. paišiya "before; in the presence of."
Fr.: cœur pré-amas
Fr.: étoile pré-dégénérée
Same as → PG 1159 star.
A technique in spectroscopy which uses a combination of several dispersive elements (prisms in series or a grism) before focusing the light on the primary disperser, usually a grating, in order to achieve high spectral resolutions.
pre-main sequence binary
dorin-e piš-rešte-ye farist
Fr.: binaire pré-séquence principale Markarian's Chain
pre-main sequence B[e] star (HAeB[e])
setâre-ye B[e]-ye piš-rešte-ye farist
Fr.: étoile B[e] pré-séquence principale
pre-main sequence star
setâre-ye piš-rešte-ye farist
Fr.: étoile pré-séquence principale
Fr.: étape pré-nova
The stage of a star before its eruption to become a nova.
Fr.: cœur pré-stellaire
A small, gravitationally unstable molecular → clump of typical size of less than 0.1 pc resulting from → gravitational collapse and → fragmentation of a larger → molecular cloud. It is a centrally concentrated structure which evolves into a → class 0 object, where eventually a single star or a stellar system is formed. Core masses range between 0.5 and 5 solar masses, with a mean number density of at least 104-105 cm-3, and a temperature as low as about 10 K. A pre-stellar core evolves into a → Class 0 object. Also called dense core.
setâre-ye piš-kutule-ye sefid
Fr.: étoile pré-naine blanche