# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 42 Search : variable
 independent random variables   ورتنده‌های ِ کاتوره‌ی ِ ناوابسته   vatandehâ-ye kâture-ye nâvâbastéFr.: variables aléatoires indépendantes   Statistics: Two random variables X and Y if and only if the value of X has no influence on the value of Y and vice versa.→ dependent; → random; → variable. independent variable   ورتنده‌ی ِ ناوابسته   Fr.: variable indépendante   Math.: A variable whose value determines the value of other variables. For example, x, in the expression y = f(x), is the independent variable. See also → dependent variable.→ independent; → variable. individual variable   ورتنده‌ی ِ تکال   vartande-ye takâlFr.: variable individuel   In → predicate logic, a variable which represents an unspecified → subject. Individual variables work just as do variables in algebra, they stand in for a value, but have no fixed value of their own. They are represented by lower case letters taken from the end of the alphabet x, y, z; and if additional variables are needed by u, v, w, as well.→ individual; → variable. intrinsic variable   ورتنده‌ی ِ درونگین   vartande-ye darunginFr.: variable intrinsèque   A variable star whose fluctuations in brightness are due to natural changes in the luminosity of the star itself, not by external causes, such as in → extrinsic variable stars.→ intrinsic; → variable. invariable plane   هامُن ِ ناورتنده   hâmon-e nâvartandéFr.: plan invariable   Mechanics: For a rotating rigid body not subject to external torque, a plane which is perpendicular to the angular momentum vector of the body, and which is always tangent to its → inertia ellipsoid.Invariable negation of → variable; → plane. irregular variable   ورتنده‌ی ِ بی‌سامان   vartande-ye bisâmânFr.: variable irrégulière   A type of variable star in which variations in brightness show no regular periodicity. There are two main types, irregular eruptive variables and irregular pulsating variables.→ irregular; → variable. linguistic variable   ورتنده‌ی ِ زبانیک   vartande-ye zabânikFr.: variable linguistique   One of several → input or → output variables of a → fuzzy logic system whose values are → words or → sentences from a natural language, instead of numerical values.→ linguistic; → variable. long-period variable   ورتنده‌ی ِ درازدوره   vartande-ye derâz dowréFr.: variable à longue période   A type of → variable star in which variations in brightness occur over long time-scales of months or years. The term generally refers to → Mira variable types.→ long; → period; → variable. Luminous Blue Variable (LBV)   ورتنده‌ی ِ آبی ِ تابان   vartande-ye âbi-ye tâbânFr.: variable bleue lumineuse   A high-luminosity variable star, which represents a transition phase in the life of a massive star when it evolves off the main sequence to become a supernova. Only about a dozen confirmed LBVs are presently known in our Galaxy. → Hubble-Sandage variable.→ luminous; → blue; → variable. Mira variable   ورتندگان ِ میراوار   vartandegân-e Mirâ-vârFr.: variables de type Mira   A periodic → variable star with cycles 100-500 days, and of → spectral types K, M, S, and C; also called → long-period variables.→ Mira; → variable. nebular variable   ورتنده‌ی ِ میغی   vartande-ye miqiFr.: variable nébulaire   A type of eruptive variable star, mainly young FU Orionis and T Tauri types, associated with nebulosity.→ nebular; → variable. optically violent variable (OVV) quasar   کو‌آسارِ ورتنده‌ی ِ نورانه سورا   kuâsâr-e vartande-ye nurâné surâFr.: quasar variable optiquement violent   A member of a small subset of quasars consisting of bright radio galaxies whose flux of visible light output can vary by as much as 50% in a single day.→ optically; → violent; → variable; → quasar. periodically variable supergiant (PVSG)   ابرغول ِ ورتنده‌ی ِ دوره‌ای   abarqul-e vartande-ye dowreyiFr.: supergéante variable périodiquement   A variable → supergiant star with typical periods of the order of 10 to 100 days and amplitudes less than a few tenths of a magnitude. PVSGs are thought to be pulsating → g modes, caused by a density inversion, arising from an → opacity bump, most likely from Fe, H, and/or He.→ periodical; → -ly; → variable; → supergiant. propositional variable   ورتنده‌ی ِ گزاره‌ای   vartande-ye gozâre-yiFr.: variable propositionnel   Logic: A → propositional symbol that represents any → proposition whatsoever. random variable   ورتنده‌ی ِ کاتوره   vartande-ye kâturéFr.: variable aléatoire   A quantity that takes different real values as a result of the → outcomes of a → random event or experiment involving specified probabilities.→ random; → variable. real dynamical variable   ورتنده‌ی ِ توانیک ِ هسیا   vartande-ye tavânik-e hasyâFr.: variable dynamique réel   A → dynamical variable which does not have an → imaginary number part.→ real; → dynamical; → variable. semiregular variable   ورتنده‌ی ِ نیمه‌بسامان   vartande-ye nime-besâmanFr.: variable semirégulière   A type of giant or supergiant pulsating variable star, with intermediate or late spectra, showing noticeable periodicity in its light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to more than 2000 days, while the shapes of the light curve may be rather different and variable with each cycle. The amplitudes may be from several hundredths to several magnitudes (usually 1-2 magnitudes in the V filter). Examples are Betelgeuse, Antares, and Rasalgethi. Semiregular variables are classified in several subtypes: SRA, SRB, SRC, and SRD.→ semi-; → regular; → variable. short-period variable   ورتنده‌ی ِ کوتاه-دوره   vartande-ye kutâh-dowréFr.: variable à courte période   A variable star that has a relatively short period with respect to stars of similar types.→ short; → period; → variable. spectroscopic variable   ورتنده‌ی ِ بیناب‌نمایی   vartande-ye binâbnemâyiFr.: variable spectroscopique   A → variable star that displays changes in its → spectrum. In such stars line intensities may vary and new lines may appear. Examples include → AG Carinae, HD 108, HD 191612, and HD 148937. variable   ورتنده   vartandéFr.: variable   Something that may or does vary. → variable star. Math.: A symbol, usually a letter, which in a mathematical or logic expression represents any member of a set of possible values or possible objects.M.E., from O.Fr. variable, from L. variabilis "changeable," from variare "to change," → vary.Vartandé agent noun from vartidan "to change," → vary.

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