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HD 86989


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Ýlgili Makaleler

UBVRI Photometry of FKSZ Stars - Part One
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1987A&AS...70..369C&db_key=AST

A new interpretation of the heavy element abundances in metal-deficient stars
Observations of element abundances in extremely metal-deficient starsare reviewed. Particular attention is given to trends in the abundancesof the neutron capture products yttrium, barium, and europium. Thevariations in Y/Fe and Ba/Fe with Fe/H are found to defy simpleexplanation in the context of current theories: the conventionalinterpretation of these abundances as resulting from s-processing may beincorrect. It is suggested rather, that the observed trends follow in anatural and straightforward manner from the assumption that the Y and Bain the most extreme metal-poor stars represent products of r-processnucleosynthesis. Implications for galactic evolution and nucleosynthesisare briefly discussed.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Su Yilani
Sað Açýklýk:10h01m51.71s
Yükselim:-12°53'55.7"
Görünürdeki Parlaklýk:7.935
Uzaklýk:186.567 parsek
özdevim Sað Açýklýk:-11.7
özdevim Yükselim:-13.3
B-T magnitude:9.047
V-T magnitude:8.027

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 86989
TYCHO-2 2000TYC 5484-973-1
USNO-A2.0USNO-A2 0750-07111763
HIPHIP 49148

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