Fr.: ensemble d'arrivée
From M.Fr. domaine "domain, estate," from O.Fr. demaine "lord's estate," from L. dominium "property, dominion," from dominus "master of a household," from domus "house;" cognate with Pers. dam, as below; Gk. domos "house;" O.C.S. domu , Russ. dom "house;" Lith. dimstis "enclosed court, property;" O.E. timber "building, structure"); PIE base *dem-/*dom- "to build."
Daman, from Av. dəmāna- "house," dami "in the house;" cf. Sogd. δmān "house;" Mod.Pers. dam "wealth, means of comfort" (often as dam o dastgâh); "threshold, doorway;" Gilaki dâmana "ceiling;" Sariqoli waδem, Yazghulami wəδem "ceiling;" Skt. dám- "house;" Proto-Iranian *damH- "to build;" Gk. demo "I build;" L. domus "house," as above.
Fr.: paroi de domaine, mur ~ ~
galaxy main sequence
rešte-ye farist-e kahkešânhâ
Fr.: séquence principale des galaxies
A scaling relation between the → star formation rate (SFR) in galaxies and the total stellar mass (M*) of the galaxies. This relation, colloquially called the "galaxy main sequence," extends over several orders of magnitudes in M* and out to → high redshifts, with a modest scatter of ~ 0.3 dex which includes both intrinsic scatter and measurement uncertainties. The existence of such tight scatter at all observed epochs suggests that most galaxies assembled their stellar mass fairly steadily rather than predominantly in → starburst episodes, implying that → mergers have a sub-dominant contribution to the global star formation history (Wuyts et al., 2011 ApJ 742, 96).
lower main sequence
rešte-ye farist-e zirin
Fr.: séquence principale inférieure
A → main sequence star whose mass is less than 1.5 Msun. Lower main sequence stars generate their energy chiefly through the → proton-proton chain. The core is surrounded by a → radiative zone above which lies a → convective envelope. In such stars the → opacity at the surface is high because of the low → surface temperature. Therefore, radiation cannot carry all the radiation because of high opacity. Thus, energy transfer takes place by → convection to the outer layer.
Fr.: domaine magnétique
Any of several microscopic areas in a → ferromagnetic material that possesses a net → magnetic field, because electron spins are aligned in the same direction. In the absence of an external magnetic field, the directions of the magnetization vectors of the separate domains do not coincide and the resultant magnetization of the whole body may be zero.
Chief in size, extent, or importance; leading; → principal.
From M.E. meyn, mayn "strength, power," from O.E. mægen "power, strength, force," from P.Gmc. *maginam- "power," from *mag- "to be able, have power."
Farist, literally "foremost" (cf. Mid.Pers. frahist "main, principal, first, much"), from far-, Mid.Pers. fra-; O.Pers. fra- "forward, forth;" Av. frā "forth," pouruua- "first"; cf. Skt. pūrva- "first," pra- "before, formerly;" Gk. pro; L. pro; O.E. fyrst "foremost," superlative of fore, E. fore + -est superlative suffix, Mid.Pers. -ist, -išt-; Av. -išta-, cf. Skt. -istha-, Gk. -istos, O.H.G. -isto, -osto, O.E. -st, -est, -ost.
Fr.: lobe principal
Same as → main lobe.
Fr.: ceinture principale
Fr.: diagonale principale
In the n x n → matrix , the entities a11, a22, ..., ann.
Fr.: lobe principal
The lobe in the reception pattern of a radio telescope that includes the region of the maximum received power. Also called major lobe and main beam.
Fr.: anneau principal
A thin strand of material encircling Jupiter; the main component in → Jupiter's ring system of three parts. The diffuse innermost boundary begins at approximately 123,000 km. The main ring's outer radius is found to be at 128,940 km,
Fr.: séquence principale
An evolutionary stage in the life of a star when it generates its energy by the conversion of hydrogen to helium via → nuclear fusion in its core. Stars spend 90% of their life on the main sequence. On the → Hertzsprung-Russell diagram it appears as a track running from top left (high temperature, high luminosity, high mass) to lower right (low temperature, low luminosity, low mass). See also → zero age main sequence (ZAMS), → terminal age main sequence (TAMS).
sazkard-e reshteh-ye farist
Fr.: ajustement par la séquence principale
The method of determining the distance to a star cluster by overlaying its main sequence on the theoretical zero-age main sequence and noting the difference between the cluster's apparent magnitude and the zero-age main sequence's absolute magnitude.
rahgašt-e rešte-ye farist
Fr.: tournant final de la séquence principale
The point on the → Hertzsprung-Russell diagram of a star cluster at which stars begin to leave the → main sequence and move toward the → red giant branch. The main-sequence turnoff is a measure of age. In general, the older a star cluster, the fainter the main-sequence turnoff. Same as → turnoff point.
post-main sequence star
setâre-ye pasâ-rešte-ye farist
Fr.: étoile post séquence principale
A star that has evolved off the → main sequence.
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
terminal age main sequence (TAMS)
rešte-ye farist bâ senn-e pâyâni
Fr.: séquence principale d'âge terminal
The locus of stars on the → Hertzsprung-Russell diagram that are at the point of exhausting hydrogen in their cores. TAMS forms the upper luminosity boundary of the → main sequence strip. See also → zero age main sequence (ZAMS).