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: 5 Search : nebular
nebular
  میغی   
miqi

Fr.: nébulaire   

Of or relating to or resembling a → nebula.

nebula + → -ar.

nebular continuum
  پیوستار ِ میغی   
peyvastâr-e miqi

Fr.: continuum nébulaire   

The part of a nebular object's → spectrum that is created by → free-free emission.

nebular; → continuum.

nebular hypothesis
  انگاره‌ی ِ میغ   
engâre-ye miq

Fr.: hypothèse nébulaire   

The hypothesis first put forward in the 18-th century that the solar system formed from a primeval nebula around the Sun. Same as the → Kant-Laplace hypothesis.

nebular; → hypothesis.

nebular line
  خط ِ میغی   
xatt-e miqi

Fr.: raie nébulaire   

A → forbidden line that is found in the spectra of → interstellar  → ionized gas. The nebular lines are emitted by several atomic species (e.g. O, O+, O++, N+, S++) and correspond to the → transition from the electronic → metastable state 1D to the → ground state  3P. Examples are the doubly ionized oxygen lines [O III] at 4959 and 5007 Å (→ [O III] doublet) and the ionized nitrogen doublet [N II] at 6548 and 6583 Å. See also → auroral line; → transauroral line.

nebular; → line.

nebular variable
  ورتنده‌ی ِ میغی   
vartande-ye miqi

Fr.: variable nébulaire   

A type of eruptive variable star, mainly young FU Orionis and T Tauri types, associated with nebulosity.

nebular; → variable.