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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 2 Search : photospheric
photospheric
  شیدسپهری   
šidsepehri (#)

Fr.: photosphérique   

Of or pertaining to a → photosphere.

photosphere; → -ic.

solar photospheric abundance
  فراوانی ِ شیدسپهری ِ خورشیدی   
farâvâni-ye šidsepehri-ye xoršidi

Fr.: abondance photosphérique solaire   

The abundance of a → chemical element as determined from the observation of solar → spectral lines. The solar chemical composition is an important ingredient in our understanding of the formation, structure and evolution of both the Sun and our solar system. Furthermore, it is an essential reference standard against which the elemental contents of other astronomical objects are compared (Asplund et al. 2009, arXiv:0909.0948). The photospheric abundances relative to hydrogen are not representative of the → protosun, or global → solar system abundances. This is because heavy-element fractionation in the Sun has altered photospheric abundances (Lodders 2003, ApJ 591, 1220).

solar; → photospheric; → abundance.