extremely metal-poor star (EMPS) — An Etymological Dictionary of Astronomy and Astrophysics

extremely metal-poor star (EMPS)

ستاره‌ی ِ اُستومانه کم‌فلز

stâre-ye ostomâné kamfelez

Fr.: étoile extrêmement pauvre en métaux

A star with an iron abundance [Fe/H] < -3 found in a → galactic halo. These stars,
whose → metallicity is typically less than one thousandth
of the solar value, are believed to have formed shortly after the → Big Bang, 13.7 billion years ago. The number of such stars depends on the primordial → initial mass function. If the IMF were steep, there could, in principle, be a lot of EMPSs formed at high → redshifts. Thus many of them could have ended up in the halos of galaxies. See also → Population III star.

See also: → extreme; → metal; → poor; → star.

An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک