Fr.: excès de couleur
The difference between the observed → color index of a star and the intrinsic color index corresponding to its → spectral type. It indicates the modification brought to a color index by the → interstellar absorption.
→ color; excess, M.E., from O.Fr., from L. excessus "departure, going beyond," p.p. excedere "to depart, go beyond," from → ex- "out" + cedere "to go, yield."
Fozuni, from afzuni "excess," afzuni kardan "to exceed bounds," → add; → color.
fozuni (#), ferehbud
The state or an instance of surpassing usual, proper, or specified limits. → color excess; → infrared excess.
From L. excessus "going beyond bounds," from stem of excedere "to go beyond," from → ex- "out" + cedere "to go, yield;" cf. Gk. hodos "way;" PIE base *ked- "to go, yield."
Fozuni, from afzuni "excess," afzuni kardan "to exceed bounds,"
from afzudan "to add, increase," from Mid.Pers. abzudan "to increase, grow;"
O.Pers. abijav- "to increase, add to, promote," from
abi-, aiby- "in addition to; to; against" + root jav-
"press forward;" Av. gav- "to hasten, drive;" Sk. jav- "to press forward,
impel quickly, excite," javate "hastens."
fozuni-ye forusorx, ferehbud-e ~
Fr.: excès infrarouge
Infrared → emission from a star in excess of that expected from a → blackbody with the temperature corresponding to the temperature of the star.
fozuni-ye notron, ferehbud-e ~
Fr.: excès de neutrons
The excess of → neutrons over → protons in an → atomic nucleus: η = (Nn - Np) / (Nn + Np).
fozuni-ye sepehri, ~ kore-yi
Fr.: excès sphérique
The difference between the sum of the three angles of a → spherical triangle and 180° (π radians).
fozuni-ye farâbanafš, ferehbud-e ultar-banafš
Fr.: excès ultraviolet
Ultraviolet emission from an object in excess of that expected for a reference. For example, → subdwarf stars show ultraviolet excess with respect to that expected from a star with → solar metallicity at a given → effective temperature. In this case, UV excess results from smaller → line blanketing in → population II stars.
→ ultraviolet; → excess.