Fr.: courbe de Hugoniot
A curve, on the pressure versus specific volume plane, representing the locus of all the possible states that can be reached by a substance immediately after the passage of a single → shock wave. For each initial condition there is a different curve. No combustion occurs in the process and, therefore, the chemical composition of the medium does not change. See also → Rayleigh line; → Crussard curve.
Named after the French physicist Pierre Henri Hugoniot (1851-1887), who worked on fluid mechanics, especially flow properties before and after shock waves; → curve.
interstellar reddening curve
xam-e sorxeš-e andaraxtari
Fr.: courbe de rougissement interstellaire
A graph showing the relation between → interstellar absorption (in magnitudes) and wavelength.
Keplerian rotation curve
xam-e carxeš-e Kepleri (#)
Fr.: courbe de rotation keplérienne
nur-xam, xam-e nur
Fr.: courbe de lumière
orbital phase curve
xam-e fâz-e madâri
Fr.: courbe de la phase orbitale
Fr.: courbe de phase
1) Astro.: A curve describing the → brightness
of a reflecting → natural satellite as a
function of its → phase angle.
Fr.: courbe de Planck
Same as → blackbody curve.
potential energy curve
xam-e kâruž-e tavand
Fr.: courbe de l'energie potentielle
A plot that displays the → potential energy of a moving body as a function of its position. It is explained by the → conservation of energy and the conversion of potential energy into → kinetic energy and vice versa.
Fr.: courbe de probabilité
A curve that describes the distribution of probability over the values of a random variable.
radial velocity curve
xam-e tondâ-ye šo'â'i
Fr.: courbe de vitesse radiale
A curve describing the variation of the radial velocity of a star, due to the Doppler effect, under the gravitational effect of a secondary body (companion or exoplanet). The amplitude of these variations depends upon the mass of the secondary and its distance from the star.
Fr.: courbe de régression
A curve representing a non-linear relationship between two or more → variables.
Fr.: courbe de réponse
Fr.: courbe de rotation
A plot of the variation in → orbital velocity of stars and → interstellar matter with distance from the center of a → galaxy. A "flat" rotation curve indicates that the mass of the galaxy increases linearly with distance from its center. See also: farsi→ Keplerian rotation curve
Rotation; → curve.
Fr.: courbe lisse
1) A curve which is free from abrupt fluctuations.
supernova light curve
xam-e nur-e abarnovâ, ~ ~ abar-now-axtar
Fr.: courbe de lumière de supernova
The graph of luminosity as a function of time after a → supernova explosion. The → light curve goes up rapidly to a → peak luminosity, then decays away slowly over time, with different rates, depending on the → supernova type. The temporal evolution of a supernova's luminosity contains important information on the physical processes driving the explosion. The observed → bolometric light curves provide a measure of the total output of converted radiation of → Type Ia supernovae, and hence serve as a crucial link to theoretical models of the explosion and evolution.
Fr.: courbe de vitesse
A plot of the radial velocity of an object against time, derived from the Doppler shift of spectral lines.