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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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<< < Z b zer ZrO > >>

Number of Results: 42
ZrO band
  باند ِ ZrO   
bând-e ZrO

Fr.: bande ZrO   

Any of the three → absorption bands due to the molecule → zirconium oxide present in the blue and visual spectral regions → S-type stars. The bands are centered on the wavelengths 4614, 5551, and 6468 Å.

zirconium oxide; → band.

ZZ Ceti star
  ستاره‌ی ِ ZZ-کتوس   
setâre-ye ZZ Ketus

Fr.: étoile de type ZZ Ceti   

A member of a class of non-radially pulsating stas that change their brightnesses with periods from 30 seconds to 25 minutes and amplitudes from 0.001 to 0.2 mag in V. Their location on the → Hertzsprung-Russell diagram identifies them as → white dwarf stars that have entered the → instability strip as they evolve along the white dwarf track.

Cetus; → star.

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