An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian
فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک
M. Heydari-Malayeri - Paris Observatory
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photoelectric photometry šidsanji-e šidbarqi Fr.: photométrie photoélectrique A photometry in which the magnitudes are obtained using a photoelectric photometer. → photoelectric; → photometry. |
photoelectron šid-elektron, nur-elektron Fr.: photoélectron An electron emitted from an atom or molecule by an incident photon in the → photoelectric effect. |
photoemissive effect oskar-e šid-gosili Fr.: effet photoémissif The emission of electrons as a result of incident radiation in the → photoelectric effect. Also called → external photoelectric effect. |
photoevaporation šidboxâreš, nurboxâreš Fr.: photoévaporation A process going on in a molecular cloud surface whereby the surface material ionized by ultraviolet photons of neighboring stars is dissipated. → photo- + → evaporation. |
photoexcitation šid-barangizeš Fr.: photoexcitation The mechanism of raising an electron to higher energies by photon absorption, when the energy of the photon is too low to cause photoionization. → photo- + → excitation. |
photograph aks, šidnegâr, nurnegâr Fr.: photographie A picture produced by photography. → picture. Aks, from Ar. 'aks "to inverse, reverse." Šidnegâr, nurnegâr, from šid, nur, → photo-, + negâr, → graph. |
photographic magnitude borz-e aksbardârik Fr.: magnitude photographique The apparent magnitude of a star as determined by measuring its brightness on a photographic plate. The photographic magnitude scale is now considered obsolete. Adj. of → photography; → magnitude. |
photographic survey bardid-e aksbardârik Fr.: relevé photographique Recording a large area of the night sky by photographic techniques, as practiced in the past before the advent of electronic detectors. Adj. of → photography; → survey. |
photography aksbardâri, šidnegâri, nurnegâri Fr.: photographie The process of recording and producing images by exposing light-sensitive detectors to light or other forms of radiation. Aksbardâri, literally "taking photograph," from aks,
→ photograph,
+ bardâri verbal noun of bardâštan "to take," composite verb from
bar- "on; up; upon; in; into; at; forth; with; near; before;
according to" (Mid.Pers. abar; O.Pers.
upariy "above; over, upon, according to;" Av. upairi "above, over,"
upairi.zəma- "located above the earth;" cf. Gk. hyper- "over, above;"
L. super-; O.H.G. ubir "over;" PIE base *uper "over") +
dâštan "to have, to possess" (Mid.Pers. dâštan;
O.Pers./Av. root dar- "to hold, keep back, maintain, keep in mind;" cf.
Skt. dhr-, dharma- "law;"
Gk. thronos "elevated seat, throne;"
L. firmus "firm, stable;" Lith. daryti
"to make;" PIE *dher- "to hold, support"). |
photoionization šid-yoneš, nur-yoneš Fr.: photoionisation The physical process in which an incident high-energy photon ejects one or more electrons from an atom, ion, or molecule. → photo- + → ionization. |
photoionize šid-yonidan, nur-yonidan Fr.: photoioniser To cause, or to undergo → photoionization. |
photoionized šid-yonidé, nur-yonidé Fr.: photoionisé Subject to, or produced by → photoionization. |
photoluminescence šid-foruzesti Fr.: photoluminescence A process in which → absorption of photons at → ultraviolet (UV) / → optical wavelengths is followed by → electronic transitions associated with the emission of longer wavelength optical and → near-IR photons. Photoluminescence has two types: → phosphorescence and → luminescence. The excitation of the photoluminescence process under astrophysical conditions results from the absorption of a single UV/optical photon, leading to an electronic transition from a → ground state (1) to a higher state (2). State (2) typically is a bound, high-lying vibrational-rotational level of the first or second electronically excited state of a molecule or molecular ion, or a high state in the → conduction band of a semiconductor particle. The excited system relaxes through a series of → vibrational-rotational transitions until the electron finds itself in an intermediate state (3), from where an optical electronic transition back to the ground state (1) is possible. In a → polycyclic aromatic hydrocarbon (PAH) molecule, for example, state (3) can either be the lowest state in the → singlet or → triplet vibrational-rotational manifold of the first excited electronic level (Witt, A. N., Vijh, U. P., 2003, astro-ph/0309674). → photo-; → luminescence. |
photometer šidsanj, nursanj Fr.: photomètre An instrument for measuring the amount of light. |
photometric šidsanji, šidsanjik, nursanji, nursanjik Fr.: photométrique Pertaining to or related to → photometry. → photometer + → -ic. |
photometric band bând-e šid-sanjik, ~ nur-sanjik Fr.: bande photométrique The range of → wavelengths allowed by a → filter used in a → photometric system. → photometric + → band. |
photometric binary dorin-e šidsanjik, ~ nursanjik Fr.: binaire photométrique A binary star whose binarity is detectable from its variability and light-curve that has certain specific characteristics. → photometric + → binary. |
photometric calibration kabizeš-e šidsanjik, ~ nursanjik Fr.: calibration photométrique A calibration which converts the measured relative magnitudes into an absolute photometry. → photometric + → calibration. |
photometric parallax didgašt-e šidsanjik Fr.: parallaxe photométrique A method of deriving the distance of a star using its → apparent magnitude and the → absolute magnitude inferred from its → spectral type. This is a misnomer, because the method has nothing to do with parallax; → photometric; → parallax. |
photometric system râžmân-e šidsanjik, ~ nursanjik Fr.: système photométrique A system of → magnitudes, each of them characterized by a set of
well-defined → passbands
(or → filters) with known
→ response curves. The system is defined by the values given for
the → standard stars.
See also: → photometric; → system. |
<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu Bok boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes met met MHD mic mid mil min mir mix mod mol mom moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>
