An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1279
spectral range
  گستره‌ی ِ بینابی   
gostare-ye binâbi

Fr.: domain spectral   

The observable spectral range provided by a spectroscope, as determined by the grating dispersion, camera focal length, and detector size.

spectral; → range.

spectral region
  ناحیه‌ی ِ بینابی   
nâhiye-ye binâbi

Fr.: région spectrale   

An extent of wavelengths into which the electromagnetic spectrum is divided; e.g. infrared or ultraviolet region.

spectral; → region.

spectral resolution
  واگشود ِ بیناب، ~ بینابی   
vâgošud-e binâb, ~ binâbi

Fr.: résolution spectrale   

The capacity of a spectrograph to separate two adjacent spectral lines. The theoretical spectral resolution depends on the grating dispersion, grating position, pixel size, collimator and camera focal length, and the entrance slit-width.

spectral; → resolution.

spectral response
  پاسخ ِ بینابی   
pâsox-e binâbi

Fr.: réponse spectrale   

Domain of the electromagnetic spectrum over which a detector is sensitive. Same as spectral sensitivity.

spectral; → response.

spectral series
  سری ِ بینابی   
seri-ye binâbi

Fr.: série spectrale   

Spectral lines or group of lines occurring in sequence.

spectral; → series.

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, → spectroscope, → spectroscopy, → spectroscopic.

spectrum

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.

spectroscope
  بیناب-نما   
binâb-namâ (#)

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.

<< < -sc Sag sam sat sca Sch Sch scr sec sec SED sei sel sem seq Sex Sha she sho sid sil sim sin sit sky sma sno Sof sol sol sol sol sou spa spa spe spe spe sph spi spl squ sta sta sta sta Ste ste sti sto str Str sub sub sub sul sup sup sup sup sur sus sym syn > >>