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

A partially reflecting mirror which permits a part of the light beam to pass through and reflects the rest.

→ beam; splitter, from to split, from M.Du. splitten, from P.Gmc. *spl(e)it-, PIE *(s)plei- "to split, splice."

Fâqgar, from fâq "split, breach, division" + tâbé→ beam.

A process whereby the (internal) → magnetic field of a star modifies the → pulsations by lifting some of its degeneracy. Instead of just one pulsation frequency, a multiplet of frequencies is then observed. This effect was proposed as a possible explanation for the observed frequency pattern of → Beta Cephei. In practice, the magnetic splitting is difficult to observe, because of the very small expected frequency difference between the peaks. However, when unaccounted for, it may lead to a wrong mode identification. The current best candidate to detect magnetic splitting is → HD 43317, since this star displays two close frequency patterns (Buysschaert et al., 2017, astro-ph/1709.02619).

→ magnetic; → splitting.

1) A crack, tear, or fissure. The act of splitting.
2) To separate by cutting, chopping, etc.

From M.Du. splitten, from P.Gmc. *spl(e)it- (cf. Dan., Fris. splitte, O.Fris. splita, Ger. spleißen "to split").

1) Fâq "a part of something separated in two sections, such as a beard, a quill pen, etc."
2) Fâqidan verbal form.

The act or instance of being split or causing something to split. → splitting of energy level.

Verbal noun of → split.

The splitting of a single atomic level into a group of closely spaced levels when the substance producing the single line is subjected to a uniform magnetic field. → Zeeman effect; → Stark effect.

→ spliting; → energy level.