skip to main content

Title: THE ABUNDANCE OF FLUORINE IN NORMAL G AND K STARS OF THE GALACTIC THIN DISK

The abundance of fluorine is determined from the (2-0) R9 2.3358 μm feature of the molecule HF for several dozen normal G and K stars in the Galactic thin disk from spectra obtained with the Phoenix IR spectrometer on the 2.1 m telescope at Kitt Peak. The abundances are analyzed in the context of Galactic chemical evolution to explore the contributions of supernovae and asymptotic giant branch (AGB) stars to the abundance of fluorine in the thin disk. The average abundance of fluorine in the thin disk is found to be [F/Fe] = +0.23 ± 0.03, and the [F/Fe] ratio is flat or declines slowly with metallicity in the range from –0.6 < [Fe/H] < +0.3, within the limits of our estimated uncertainty. The measured abundance of fluorine and lack of variation with metallicity in Galactic thin disk stars suggest neutrino spallation in Type II supernovae contributes significantly to the Galactic fluorine abundance, although contributions from AGB stars may also be important.
Authors:
;  [1]
  1. Astronomy Department, Indiana University Bloomington, Swain West 319, 727 East Third Street, Bloomington, IN 47405-7105 (United States)
Publication Date:
OSTI Identifier:
22520162
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 150; Journal Issue: 3; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMPTOTIC SOLUTIONS; COSMIC NEUTRINOS; ELEMENT ABUNDANCE; FLUORINE; GIANT STARS; IRON; METALLICITY; MILKY WAY; MOLECULES; SPALLATION; TELESCOPES; TYPE II SUPERNOVAE; VARIATIONS