An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13116 Search : far
Doppler broadening
  پهنش ِ دوپلر   
pahneš -e Doppler

Fr.: élargissement Doppler   

In atomic physics, the broadening of an emission or absorption line due to the Doppler effect. Random motions of molecules or atoms of the gas that is emitting or absorbing the radiant energy shift the apparent wavelength of each emitter, and the cumulative effect of indivisual shifts is to broaden the line.

Doppler effect; → broadening.

Doppler effect
  اسکر ِ دوپلر   
oskar-e Doppler

Fr.: effet Doppler   

Change in frequency of a wave (light, sound) due to the relative motion of source and receiver. Approaching objects have their wavelengths shortened. Receding objects have emitted wavelengths lengthened.

Doppler, after Christian Andreas Doppler (1803-1853), Austrian physicist who first described how the observed frequency of sound and light waves is affected by the relative motion of the source and the detector; → effect.

Doppler profile
  فراپال ِ دوپلر   
farâpâl-e Doppler

Fr.: profil Doppler   

The shape of the spectral line resulting from the Doppler broadening.

Doppler effect; → profile.

Doppler shift
  کیب ِ دوپلر   
kib-e Doppler

Fr.: décalage Doppler   

Effect of the relative motion of a wave source (light, sound) and the observer. If the source is moving away, the wavelength is stretched (shifted toward lower frequencies). If the source is approaching, the wavelength is compressed (shifted toward higher frequencies). These effects, known as Doppler shifts, are in the case of light waves called redshift and blueshift, respectively.

Doppler effect; → shift.

Doppler tomography
  برش نگاری ِ دوپلر   
borešnegâri-ye Doppler

Fr.: tomographie Doppler   

A technique using a series of Doppler-shifted line profiles at different orbital phases in cataclysmic variable stars (CVs) to image the compact system in the light of a particular emission line. Although developed for CVs, the method has wider applications. An alternative method is → eclipse mapping.

Doppler effect; → tomography.

Dorado
  ماهی ِ زرین، زرین ماهی   
Mâhi-ye zarrin, zarrin mâhi (#)

Fr.: Dorade   

The Swordfish. A constellation in the southern hemisphere near → Reticulum and → Pictor. It contains most of the → Large Magellanic Cloud which laps over to some extent into the neighboring constellation → Mensa. The south → ecliptic pole also lies within this constellation. Abbreviation: Dor, Genitive: Doradus.

Dorado, from Sp., from L.L. deaurutus, p.p. of deaurare "to gild," from → de- + aurium "gold." Dorado (Coryphaena hippurus) is a surface-dwelling fish found in off-shore tropical and subtropical waters worldwide. It is distinguished by dazzling golden colors on the sides.

Mâhi "fish," from Mid.Pers. mâhik, Av. masya-, cf. Skt. matsya-, Pali maccha-.
Zarrin "golden," from zarr "gold," Mid.Pers. zarr, Av. zaranya-, zarənu- "gold," O.Pers. daraniya- "gold," Skt. hiranya- "gold;" also Av. zaray-, zairi- "yellow, green," Mod.Pers. zard "yellow," Skt. hari- "yellow, green," Gk. Khloe lit. "young green shoot," L. helvus "yellowish, bay," Rus. zeltyj "yellow," P.Gmc. *gelwaz, Du. geel, Ger. gelb, E. yellow.

dosage
  دزش   
dozeš

Fr.: dosage   

1) The giving of a dose.
2) Regulation or determination of doses.
3) The addition of an ingredient or the application of an agent in a measured dose (Merriam-Webster.com).

From Fr. dosage, → dose.

dose
  ۱) دز؛ ۲) دزیدن   
1) doz; 2) dozidan

Fr.: 1) dose; 2) doser   

1a) A specified quantity of medicine taken at any one time.
1b) The amount of radiation administered as therapy to a given site.
2a) To give or prescribe something, such as medicine, in specified amounts.
2b) To give someone a dose of medicine to.

M.E., from M.Fr. dose, from L.L. dosis, from Gk. dosis "a portion prescribed," literally "a giving," used by Galen and other Gk. physicians to mean an amount of medicine, from stem of didonai "to give."

Doz, loan from Fr., as above. Dozidan infinitive from doz.

dosing
  دزش   
dozeš

Fr.: dosage   

1) The administration of a dose.
2) → dosage.

dose; → -ing.

dot product
  فر‌آورد ِ مرپلی   
farâvard-e marpeli

Fr.: produit scalaire   

Same as → scalar product.

O.E. dott "speck, head of a boil," perhaps related to Norw. dot "lump, knot," Du. dot "knot, wisp;" cognate with O.H.G. tutta "nipple;" → product.

Bastâk, → product; marpeli, → scalar.

double
  دوتایی   
dotâyi (#)

Fr.: double   

1) Composed of two like parts or members.
2) Twice as large, heavy, strong, etc.
3) Anything that is twofold in size or amount or twice the usual size, quantity, strength, etc.

From O.Fr. duble, from L. duplus "twofold" (Gk. diplos "double"), from duo "two" + -plus "fold."

Dotâyi, from dotâ, from do "two," akin to L. duo, + "fold, plait, ply; piece, part," Mid.Pers. tâg "piece, part."

double integral
  درستال ِ دوتایی   
dorostâl-e dotâyi

Fr.: intégrale double   

The simplest case of a → multiple integral.

double; → integral.

double pulsar
  پولسار ِ دوتایی، تپار ِ ~   
pulsâr-e dotâyi, tapâr-e ~ (#)

Fr.: pulsar double   

A → binary pulsar consisting of two pulsars. The only known example is PSR J0737-3039 (A and B), discovered in 2003 (Burgay et al. Nature 426, 531). The rotation periods of the pulsars are 22.7 and 2.8 milliseconds respectively. Each of them has a mass about 1.3 times that of the Sun and revolves around their → center of gravity with a period of 2.4 hours. According to the theory of → general relativity, such a binary should lose energy through the emission of → gravitational waves. As deduced from the change in orbital period, the separation of the pulsars is reducing by about 7 mm per day, in exact agreement with theory. It is expected that the pulsars will eventually merge in about 85 million years.

double; → pulsar.

double refraction
  شکست ِ دوتایی   
šekast-e dotâyi

Fr.: double réfraction   

Formation of two refracted rays of light from a single incident ray; property of certain crystals, notably calcite.

double; → refraction.

double root
  ریشه‌ی ِ دوتایی   
riše-ye dotâyi

Fr.: racine double   

A → root x0 of function f(x), if f(x0) = 0, df/dx | x0 = 0, and d2f/dx2 | x0≠ 0. See also → simple root.

double; → root.

double shell burning
  سوزش ِ پوسته‌ی ِ دوتایی   
suzeš-e puste-ye dotâyi

Fr.: combustion double coquille   

A situation in the evolution of an → asymptotic giant branch star whereby both hydrogen and helium shells provide energy alternatively. As the burning → helium shell approaches the hydrogen-helium discontinuity, its luminosity decreases because it runs out of the fuel. As a consequence, the layers above contract in response, thus heating the extinguished → hydrogen shell until it is re-ignited. However, the shells do not burn at the same rate: the He burning shell becomes thermally unstable and undergoes periodic → thermal pulses.

double; → shell; → burning.

double slit
  شکاف ِ دوتایی   
šekâf-e dotâyi (#)

Fr.: fente double   

A pair of adjacent holes or slits made on a dark and plane surface, used in optical experiments, such as interference and diffraction.

double; → slit.

double star
  ستاره‌ی ِ دوتایی   
setâre-ye dotâyi (#)

Fr.: étoile double   

An apparently single star which better observational resolution shows it to be a pair of closely lying stars. They may or may not be physically related.

double; → star.

double vision
  دوبینی   
dobini (#)

Fr.: vision double   

Same as → diplopia.

double; → vision.

double white dwarf
  سفیدکوتوله‌ی ِ دوتایی   
sefid kutule-ye dotâyi

Fr.: naine blanche double   

A → double-lined binary with two → white dwarf components. Short-period double white dwarfs can lose → orbital angular momentum by emitting → gravitational radiation and if the total mass of the binary exceeds the → Chandrasekhar limit, their eventual → merger might produce a → Type Ia supernova.

double; → white; → dwarf.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg 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 > >>