CASPEC observations of the most metal-deficient main-sequence star currently known.

Details CASPEC observations of the most metal-deficient main-sequence star currently known. CASPEC observations of the most metal-deficient main-sequence star currently known.

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989msngr..58...40n&link_type=abstract

The Messenger, vol. 58, p. 40-41

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Metal-Deficient Stars: Spectra, Metal-Deficient Stars: Spectroscopic Binaries

Scientific paper

The apparent absence of first generation stars with zero or negligible amounts of heavy elements is a longstanding problem in connection with theories of nucleosynthesis in stars and models of galactic chemical evolution. Despite extensive search on objectiveprism plates, only two stars are known to have a metal abundance less than 1/1000 of the solar metal abundance, i.e. [Fe/H] < -3.0. The first one is G64- 12, a main-sequence turnoff star, with [Fe/H] = -3.5 (Carney and Peterson 1981). The other one is CD -38°245, a red giant with [Fe/H] = -4.5 (Bessell and Norris 1984). Here I briefly report on some CASPEC observations of a mainsequence turnoff star having a similar low metal abundance as CD -38°245. Surprisingly, this new ultra-metal-deficient star is a double-lined spectroscopic binary.

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