THE EXTREME OVERABUNDANCE OF MOLYBDENUM IN TWO METAL-POOR STARS
- Astrophysical Advances and UCO/Lick, 601 Marion Pl, Palo Alto, CA 94301 (United States)
We report determinations of the molybdenum abundances in five mildly to extremely metal-poor turnoff stars using five Mo II lines near 2000 A. In two of the stars, the abundance of molybdenum is found to be extremely enhanced, as high or higher than the neighboring even-Z elements ruthenium and zirconium. Of the several nucleosynthesis scenarios envisioned for the production of nuclei in this mass range in the oldest stars, a high-entropy wind acting in a core-collapse supernova seems uniquely capable of the twin aspects of a high molybdenum overproduction confined to a narrow mass range. Whatever the details of the nucleosynthesis mechanism, however, this unusual excess suggests that very few individual nucleosynthesis events were responsible for the synthesis of the light trans-Fe heavy elements in these cases, an unexpected result given that both are only moderately metal-poor.
- OSTI ID:
- 21612642
- Journal Information:
- Astrophysical Journal, Vol. 742, Issue 1; Other Information: DOI: 10.1088/0004-637X/742/1/21; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COSMOLOGY AND ASTRONOMY
ABUNDANCE
ASTROPHYSICS
MOLYBDENUM
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
RUTHENIUM
STAR EVOLUTION
STARS
ULTRAVIOLET RADIATION
ZIRCONIUM
ELECTROMAGNETIC RADIATION
ELEMENTS
EVOLUTION
METALS
PHYSICS
PLATINUM METALS
RADIATIONS
REFRACTORY METALS
SYNTHESIS
TRANSITION ELEMENTS