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 : OH
OH
  OH   
OH

Fr.: OH   

1) A Hydroxyl radical formed by abstraction of a hydrogen atom from water.
2) An OH group within a molecule.

From → hydro- + ox(y)- a combining form meaning "sharp, acute, pointed, acid," used in the formation of compound words, from Gk, oxys "sharp, keen, acid" + -yl a suffix used in the names of chemical radicals, from Fr. -yle, from Gk. hyle "matter, substance."

OH line
  خطِ OH   
xatt-e OH

Fr.: raie de OH   

Emission or absorption lines on an electromagnetic spectrum generated by hydroxyl, → OH molecules. At present, four principal lines are known in the radio domain at frequencies of 1612, 1665, 1667, and 1720 MHz, or wavelengths of approximately 18 centimeters.

OH; → line.

OH maser
  میزرِ OH   
meyzer-e OH

Fr.: maser OH   

A → maser phenomenon created by → OH molecules with characteristic → OH lines. OH masers are detected toward a variety of astronomical environments, including massive star formation regions and evolved late-type stars.

OH; → maser.

OH source
  خنِ OH (هیدروکسیل)   
xan-e OH (hidroksil)

Fr.: source OH   

An astronomical source emitting microwave radiation characteristic of the hydroxyl OH molecule, especially one showing a maser effect. OH sources are found in molecular clouds in interstellar medium and in the cool envelopes of evolved stars.

OH, chemical compound hydroxyl; → source.

OH/IR star
  ستاره‌یِ OH/فروسرخ   
setâre-ye OH/forusorx

Fr.: étoile OH/IR   

An evolved Mira-type star which is associated with strong OH maser and strong infrared (IR) emission from the surrounding shell of warm gas and dust.

OH; → infrared; → star.