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: 491
blindness
  کوری   
kuri (#)

Fr.: cécité   

The state or condition of being sightless.

blind; → -ness.

blink
  مژیدن   
možidan

Fr.: clignoter   

1) To close and open the eyes rapidly.
2) To shine intermittently; flash on and off.

M.E. blinken, variant of blenken "to blench;" cf. Du. and Ger. blinken.

Možidan, from možé "eyelash," Mid.Pers. mec "eyelash," mecitan "to blink," cf. Skt. mes "to open the eyes," O.C.S. po-mežiti "to close the eyes." → twinkling.

blink comparator
  هم‌سنجگر ِ مژشی   
hamsanjgar-e možeši

Fr.: comparateur à clignotement   

An instrument for comparing two photographs of the same stellar field, taken at different times, by quickly alternating from one to the other. The purpose of the comparison is to detect subtle changes in the position or brightness of the stars.

blink; → comparator.

Hamsanjgar, → comparator; možeš noun from možidan, → blink.

blinking
  مژش   
možeš

Fr.: clignotement   

An intermittent appearance of a group of characters on the display terminal, usually used to convey a message to the user.

Blinking, noun from to blink.

Možeš, noun from možidan, → blink (v).

blister
  تاول   
tâval (#)

Fr.: ampoule   

A small cyst on the skin, containing watery liquid, as from a burn or other injury.

M.E. blister, blester, from O.Fr. blestre, of Germanic origin.

Tâval "blister" (variants Torbet-Heydariye-yi toval, Guqari tavol), from suffixed (-al) tâv- tav, taf- "to heat, burn, shine," variant of tâb-, tâbidan "to shine," → luminous.

blister model
  مدل ِ تاول   
model-e tâval

Fr.: modèle d'ampoule   

A model according to which an → H II region is a hot mass of ionized gas located on the surface of a → molecular cloud, like a blister on the body skin.

blister; → model.

blitzar
  درخشار، بلیتزار   
deraxšâr, blitzâr

Fr.: blitzar   

A new type of astronomical object, appearing as an intense → burst of → radio emission, proposed to explain → fast radio bursts. In some models, blitzars result from the sudden → collapse of a hypothetical → supermassive neutron star.

From Ger. Blitz, "→ flash, lightening," + -âr ending component, as in → pulsar.

blizzard
  دمه   
damé (#)

Fr.: blizzard   

A severe weather condition characterized by high winds (at least 55 km/h) and reduced visibility due to violent snowstorm.

Blizzard, of unknown origin.

Damé "wind and snow storm."

blob
  ژیگ   
žig

Fr.: tache, concentration, condensation   

1) General: Drop of liquid; small round mass (e.g. wax); spot of color.
2) Astro.: A relatively → small, → unresolved source lying toward a much larger structure. → high-excitation blob.

From M.E. bubelen "to bubble."

Žig "drop," probably from žohidan "to drop," variant of cakidan "to drop."

blood
  خون   
xun (#)

Fr.: sang   

The red liquid that circulates in the arteries and veins of humans and other vertebrate animals, carrying oxygen to and carbon dioxide from the tissues of the body (OxfordDictionaries.com).

M.E. blo(o)d, O.E. blôd; akin to O.Frisian, O.Saxon blôd, O.H.G. bluot (Ger. Blut), Gothic bloth.

Xun, from Mid.Pers. xûn; cf. Sogd. xurn, Khotanese hûna, Yaghnobi waxin, Av. vohunī,

blooming
  سرریز   
sar-riz

Fr.: blooming, bavure   

In a → CCD detector, the spill of charge to adjacent → pixels due to over-illumination by a too bright source. Same as charge bleeding.

Blooming "glare," from to bloom "to glare, glow."

Sar-riz "spill-out, overflowing," from sar "top," → head, + riz "pouring," from rixtan "to pour," → overflow.

blow
  دمیدن   
damidan (#)

Fr.: souffler   

1) To move along, carried by or as by the wind.
2) To produce or emit a current of air, as with the mouth or a bellows.
3) Of a horn, trumpet, etc.) to give out sound.
4) To make a blowing sound; whistle (Dictionary.com).

M.E., from O.E. blawan "blow, breathe, make an air current; kindle; inflate; sound a wind instrument;" cf. O.H.G. blaen, Ger. blähen; from PIE *bhle- "to swell, blow up."

Damidan, from Mid.Pers. damidan "to blow, breathe;" dam "breath, breath of an owen; bellows; smoke; air," also "moment, time;" Av. dāδmainya- "blowing up;" cf. Skt. dahm- "to blow," dhámati "blows;" Gk. themeros "austere, dark-looking;" Lith. dumti "to blow;" PIE dhem-/dhemə- "to smoke, to blow."

blue
  آبی   
âbi (#)

Fr.: bleu   

The hue of that portion of the visible spectrum lying between green and indigo, evoked in the human observer by radiant energy with wavelengths of approximately 420 to 490 nanometers.

From O.Fr. bleu, P.Gmc. *blæwaz, from PIE base *bhle-was "light-colored, blue, blond, yellow."

Âbi "color of water," from âb "water," Mid.Pers. âb, O.Pers./Av. âp-, Skt. âp-, PIE *âp-; → Aquarius.

blue compact dwarf galaxy
  کهکشان ِ کوتوله‌ی ِ آبی ِ همپک   
kahkešân-e kutule-ye âbi-ye hampak

Fr.: galaxie naine bleue compacte   

An small → irregular galaxy undergoing → violent star formation activity. These objects appear blue by reason of containing clusters of hot, → massive stars which ionize the surrounding interstellar gas. They are chemically unevolved since their → metallicity is only 1/3 to 1/30 of the solar value. Same as → H II galaxy.

blue; → compact; → dwarf; → galaxy.

blue continuum
  پیوستار ِ آبی   
peyvastâr-e âbi

Fr.: continuum bleu   

The → continuum emission of an astronomical source with wavelengths between about 492 and 455 nm.

blue; → continuum.

blue giant
  غول ِ آبی   
qul-e âbi

Fr.: géante bleue   

A giant star with spectral type O or B.

blue; → giant.

Qul, → giant; âbi, → blue.

blue halo star
  ستارگان ِ آبی ِ هاله   
setâregân-e âbi-ye hâlé

Fr.: étoiles bleues du halo   

A star belonging to a variety of stars located above the → horizontal branch and blueward of the → red giant branch in the → Hertzsprung-Russell diagram of the → halo population.

blue; → halo; → star.

Setâregân plural of setâré, → star, âbi, → blue, hâlé, → halo.

blue HB star
  ستاره‌ی ِ BHB   
setâre-ye BHB

Fr.: étoile BHB   

Same as → blue horizontal branch star.

blue; → horizontal; → branch; → star.

blue hook star
  ستاره‌ی قلاب آبی   
setare-ye qollab-e abi

Fr.: étoile du crochet bleu   

A rare class of → horizontal branch (HB) stars that so far have been found in only very few Galactic → globular clusters. These stars are such called because they form a blue hook at the hot end of the HB in → far ultraviolet (FUV) → color-magnitude diagrams. The physical mechanism that produces blue hook populations is still uncertain. At least two scenarios have been proposed.
In the first scenario these stars are explained as a consequence of extreme → mass loss during the → red giant branch phase and late helium flashing while descending the → white dwarf cooling track. Due to the thin residual hydrogen envelope, helium is mixed into the envelope and hydrogen is mixed into the core during the late → helium flash. As a result, the stars are hotter and UV-fainter than canonical → extreme horizontal branch stars (EHB).
By contrast, in the He self-enrichment scenario the EHB and blue hook stars are produced via the normal evolution of He-enriched sub-populations in globular clusters. These sub-populations might have formed from the ejecta of intermediate-mass → asymptotic giant branch (AGB) stars of the first generation of stars. For the same age and → metallicity, He-enriched HB stars have smaller masses than normal HB stars, resulting in bluer → zero age horizontal branch star (ZAHB) locations. They are also brighter in the FUV, but this effect is reversed for very hot He-enriched HB stars with → effective temperatures larger than 19000 K.
See Dieball A., et al., 2013, arXiv:0901.1309v1, and for blue hook stars in ω Cen cluster, M. Tailo et al., 2015, Nature 523, 318.

blue; → hook; → star.

blue horizontal branch star
  ستاره‌ی ِ آبی ِ شاخه‌ی ِ افقی   
setâre-ye âbi-ye šâxe-ye ofoqi

Fr.: étoile bleue de la branche horizontale   

A member of a population of blue stars appearing on the → horizontal branch in the → Hertzsprung-Russell diagram of the Galactic → halo populations and → globular clusters. Belonging to → spectral types B3 to A0, they have evolved past the → red giant stage and are burning helium in their core.

blue; → horizontal; → branch, → star.

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