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: 13048 Search : far
spectral synthesis
  هندایش ِ بینابی   
handâyeš-e binâbi

Fr.: synthèse spectrale   

The process of computing line strengths in stellar spectra using an appropriate stellar atmosphere model, atomic and molecular data, and the numerical solution of the → radiative transfer equation at each point in the spectrum.

spectral; → synthesis.

spectral type
  گونه‌ی ِ بینابی   
gune-ye binâbi

Fr.: type spectral   

A group into which stars may be classified according to the characteristics of their spectra. Spectral type correlates with the star's → effective temperature and → color. There are seven main spectral types. From hot and blue to cool and red, they are O, B, A, F, G, K, and M. Each spectral type is divided into several subtypes. For example, from warmest to coolest, spectral type G is G0, G1, G2, G3, and so on to G9. A precise → spectral classification requires determining the → luminosity class. The Sun is spectral type G2 V.

spectral; → type.

spectral variability
  ورتندگی ِ بینابی   
vartandegi-ye binâbi

Fr.: variabilité spectrale   

The state of a spectrum from an astronomical object in which the lines change with time as far as their intensity, profile, and wavelength are concerned.

spectral; → variability.

spectro-
  بیناب-   
binâb- (#)

Fr.: spectro-   

A combining form representing → spectrum in compound words.
spectrogram, → spectrograph, → spectroheliogram, → spectroheliograph, → spectrometer, → spectrophotometer, → spectropolarimeric, → spectropolarimetry, → spectroscope, → spectroscopy, → spectroscopic.

spectrum

Spectro-Polarimetric High-contrast Exoplanet (SPHERE)
     

Fr.: Spectro-Polarimetric High-contrast Exoplanet (SPHERE)   

The → extreme adaptive optics system and → coronagraphic facility at the → European Southern Observatory (ESO) → Very Large Telescope (VLT) (UT3) available from May 2014. Its primary science goal is imaging, low-resolution spectroscopic, and polarimetric characterization of → exoplanetary system at → visible and → near-infrared wavelengths (0.5-2.32 μm). SPHERE is capable of obtaining → diffraction-limited images at 0''.02 to 0''.08 resolution depending on the wavelength. Its → spectral resolution is 30 to 350, depending on the mode.

spectro-; → polarimetric; → high; → contrast; → exoplanet.

spectrogram
  بیناب-نگاشت   
binân-negâš (#)

Fr.: spectrogramme   

A plot of the intensity of light at different wavelengths obtained using a spectrograph.

spectro-; → -gram.

spectrograph
  بیناب-نگار   
binâb-negâr (#)

Fr.: spectrographe   

An instrument that disperses the light into spectral lines and records them.

spectro-; → -graph.

spectroheliogram
  هور-بیناب‌نگاشت   
hur-binâbnegâšt

Fr.: spectrohéliogramme   

An image of the Sun taken in the light of one particular wavelength.

spectro-; → heliogram.

spectroheliograph
  هور-بیناب‌نگار   
hur-binâbnegâr

Fr.: spectrohéliographe   

An instrument for recording monochromatic images of the Sun.

spectro-; → heliograph.

spectrometer
  بیناب‌سنج   
binâb-sanj

Fr.: spectromètre   

1) A spectrograph in which the spectrum is recorded by electronic means so that wavelength, intensity, etc. can be measured.
2) An instrument for determining the distribution of energies in a beam of particles.

spectro-; → -meter.

spectrophotometer
  بیناب-نورسنج   
binâb-nursanj

Fr.: spectrophotomètre   

An instrument designed to measure the intensity of a particular spectral line or a series of spectral lines.

spectro-; → photometer.

spectrophotometric
  بیناب-شیدسنجیک   
binâb-šidsanjik

Fr.: spectrophotométrie   

Of or relating to → spectrophotometry.

spectrum; → photometry.

spectrophotometry
  بیناب-شیدسنجی   
binâb-šidsanji

Fr.: spectrophotométrie   

In astronomy, measurement of the absolute fluxes of the components of different frequencies in the spectrum of a light source.

spectrum; → photometry.

spectropolarimetric
  بیناب-قطبش‌سنجی، بیناب-قطبش‌سنجیک   
binâb-qotbešsanji, binâb-qotbešsanjik

Fr.: spectropoolarimétrique   

Of or relating to → spectropolarimetry.

spectropolarimetry; → -ic.

spectropolarimetry
  بیناب-قطبش‌سنجی   
binâb-qotbešsanji

Fr.: spectropolarimétrie   

A technique of observation in → astrophysics which combines → spectroscopy and → polarization measurements. Spectropolarimetry has a wide range of applications in astrophysics, including → stellar magnetic field studies. → ESPaDOnS, → HARPSpol.

spectro-; → polarimetry.

spectroscope
  بیناب-نما   
binâb-nemâ (#)

Fr.: spectroscope   

An optical instrument for forming and examining the spectrum of a light source. The instrument contains a narrow slit through which the light enters. The slit is placed at the focus of a positive lens called the collimator lens to form a beam of parallel rays. The beam of light falls on a dispersing element (prism, grating, or grism) which separates the light into its colors. This spectrum can be observed with an ocular (in the spectroscope) or recorded on a detector (in the spectrograph).

spectro-; → -scope.

spectroscopic
  بیناب‌نمایی، بیناب‌نماییک   
binâbnemâyi, binâbnemaayik

Fr.: spectroscopique   

Of or relating to → spectroscopy.

spectro-; → -scopy; → -ic.

spectroscopic binary
  دُرین ِ بیناب‌نمایی   
dorin-e binâbnemâyi

Fr.: binaire spectroscopique   

A binary system that cannot be resolved by a telescope, but can be identified by means of the Doppler shift of the spectral lines. As stars revolve, they alternately approach and recede in the line of sight. This motion is shown up in their spectra as a periodic oscillation or doubling of spectral lines.

spectroscopic; → binary.

spectroscopic degeneracy
  واگنی ِ بیناب‌نمایی   
vâgeni-ye binâbnemâyi

Fr.: dégénérescence spectroscopique   

The situation in which spectroscopic features in a certain optical region are not sensitive enough to distinguish adjacent → luminosity classes, for instance → dwarf stars from → giant stars.

spectroscopic; → degeneracy.

spectroscopic mass
  جرم ِ بیناب‌نمایی   
jerm binâbnemâyi

Fr.: masse spectroscopique   

The stellar mass derived from → gravity (g) and radius (R), expressed by M = gR2/G, where G is the → gravitational constant. Spectroscopic mass conveys the actual mass of the star, in contrast with its → initial mass.

spectroscopic; → mass.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit cla clo clo clu 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 Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg 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 Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad 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 Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>