Other
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.356..500v&link_type=abstract
Nature (ISSN 0028-0836), vol. 356, April 9, 1992, p. 500, 501.
Other
74
Abundance, Fractionation, Peculiar Stars, Stellar Composition, Stellar Luminosity, Zinc, Interstellar Chemistry, Interstellar Gas, Interstellar Matter, Metallicity, Photosphere, Stellar Envelopes, Stellar Mass
Scientific paper
A small number of intrinsically luminous low-mass stars have been shown to have photospheric carbon, nitrogen, oxygen, and sulfur abundances within an order of magnitude of solar values with all other normally abundant metals present in only trace amounts. In two stars, iron is deficient by nearly five orders of magnitude. Two possible explanations are that the low iron content is primordial, implying a very great age, whereas the CNO and S abundances have been acquired during evolution, or that the CNO and S abundances reflect the initial stellar composition and the low iron content is the result of chemical separation by dust formation. The detection of appreciable amounts of zinc in the star HD52961 is reported here, and it is argued that, because zinc will condense into dust only at rather low temperatures, its detection in near normal amounts is convincing evidence for the fractionation hypothesis.
Mathis John S.
van Winckel Hans
Waelkens Christoffel
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