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: 17 Search : ket
blanket
  پتو   
patu (#)

Fr.: couverture   

1) A large piece of thick cloth for use as a bed covering, animal covering, etc, enabling a person or animal to retain natural body heat.
2) Any extended covering or layer (Dictionary.com).
blanketed model, → blanketing, → blanketing effect, → line blanketing, → line-blanketed model, → unblanketed model, → wind blanketing.

From M.E., from O.Fr. blanchet, diminutive of blanc "white; white cloth."

Patu "blanket; a kind of woolen cloth," Kermâni dialect poto "wollen; woolly;" cf. Skt. patta- "cloth, colored or fine cloth."

blanketed model
  مدل ِ پتومند   
model-e patumand

Fr.: modèle à effet de couverture   

line blanketing.

blanketing
  پتومندی   
patumandi

Fr.: effet de couverture   

line blanketing.

blanketing effect
  ا ُسکر ِ پتومندی   
oskar-e patumandi

Fr.: effet de couverture   

line blanketing.

bracket
  براکت   
brâket

Fr.: bracket   

In Dirac's notation, an expression which is a → scalar product of the dual vectors → bra and → ket which describe a quantum state. The bra vector appears on the left of the ket vector.

From M.Fr. braguette "codpiece armor."

Brackett series
  سری ِ براکت   
seri-ye Brackett

Fr.: série de Brackette   

A series of lines in the infrared spectrum of atomic hydrogen due to electron jumps between the fourth and higher energy levels (Br α has wavelength 4.052 μm, Br γ 2.166 μm).

Named after the American physicist Frederick Brackett (1896-1980); → series.

ejecta blanket
  پتو‌ی ِ اشاناک   
patu-ye ešânâk

Fr.: couverture d'éjecta   

Of an → impact crater, the ejecta that after the → impact event settles back to the Earth's surface. The ejecta blanket is thick near the → crater rim and thin outward from the crater.

ejecta; → blanket.

ket
  کت   
ket

Fr.: ket   

In Dirac's notation, a vector which describes the state of a quantum system, whether it is in a space of finite or infinite dimensions. A ket vector, written as | A >, is the dual of the → bra. Like the bra, it appears as an incomplete → bracket expression.

From -ket the second syllable in → bracket.

line blanketing
  پتومندی ِ خط   
patumandi-ye xatt

Fr.:   

In stellar atmosphere models, the effect of metallic lines on the atmospheric structure of stars. The additional opacities of thousands of metallic lines alter the radiative transfer, leading to changes in the temperature. The emergent spectrum is consequently modified.

line-blanketed model.

line-blanketed model
  مدل ِ پتومند   
model-e patumand

Fr.:   

A stellar atmosphere model which includes metals or uses methods to reproduce their effects, → line blanketing.

line; → blanket; → model.

Plaskett's star
  ستاره‌ی ِ پلسکت   
setâre-ye Plaskett (#)

Fr.: étoile de Plaskett   

A → binary system consisting of two → massive stars, which are → supergiants of → spectral types O7.5 and O6. The two components are so close together that they orbit each other with a period of 14.4 days only. The Plaskett's star is a → double-line binary. The estimated masses of the components are 43 (Plaskett A) and 51 (Plaskett B) → solar masses. The lower mass component is optically brighter than the other star. Also known as HR 2422 and HD 47129 (See, e.g., Bagnuolo et al. 1992, ApJ 385, 708).

Named after the Canadian astronomer John S. Plaskett (1865-1941), who made a detailed spectroscopic study of this star in 1922.

rocket
  روکت   
roket

Fr.: fusée   

A projectile driven by reaction propulsion that carries its own propellants. → missile = mušak (موشک).

From It. rocchetto "a rocket," literally "a bobbin," diminutive of rocca "a distaff," with reference to its shape.

rocket astronomy
  اخترشناسی با روکت   
axtaršenâsi bâ roket

Fr.: astronomie par fusée   

The study of celestial bodies in the wavelengths that are almost completely absorbed by the atmosphere, by using a rocket to carry instruments above 250 km to measure the searched for phenomena.

rocket; → astronomy.

rocketry
  روکت‌شناسی، روکت‌گری   
roket šenâsi, roketgari

Fr.: fuséologie   

The science of rocket design, development, and flight.

rocket + -ry a noun suffix.

Roket šenâsi, from roket, → rocket, + šenâsi, → -logy; roketgari with suffix -gari, from -gar, → -or.

unblanketed model
  مدل ِ ناپتومند   
model-e nâpatumand

Fr.: modèle non blanketé   

A stellar atmosphere model which ignores metals and their physical effects. → line-blanketed model; → line blanketing.

un-; → blanketed model.

wave packet
  بسته‌ی ِ موج   
baste-ye mowj (#)

Fr.: paquet d'onde   

A traveling → waveform consisting of the → superposition of several → waves of different → wavelengths and → phases.

wave; packet from M.E. pak "bundle" + diminutive suffix -et; maybe from M.Fr. pacquet.

Basté "packet," literally "bound, tied; set," p.p. of bastan "to form, bind, tie" (Mid.Pers. bastan/vastan "to bind, shut;" Av./O.Pers. band- "to bind, fetter," banda- "band, tie;" cf. Skt. bandh- "to bind, tie, fasten;" Ger. binden; E. bind; PIE base *bhendh- "to bind").

wind blanketing
  پتومندی ِ باد   
patumandi-ye bâd

Fr.: effet de couverture du vent   

A process whereby dense winds of very luminous O type stars modify the temperature and internal structure of the underlying photosphere by scattering back a considerable part of the coming photospheric radiation. Not to be confused with → line blanketing .

Thus called because the wind acts like a blanket and heats the photosphere * by reflecting its radiation; → wind.