Far Ultraviolet Spectroscopic Explorer Measurements of Interstellar Fluorine
Abstract
The source of fluorine is not well understood, although core-collapse supernovae, Wolf-Rayet stars, and asymptotic giant branch stars have been suggested. A search for evidence of the ν-process during Type II supernovae is presented. Absorption from interstellar F I is seen in spectra of HD 208440 and HD 209339A acquired with the Far Ultraviolet Spectroscopic Explorer. In order to extract the column density for F I from the line at 954 Å, absorption from H2 has to be modeled and then removed. Our analysis indicates that for H2 column densities less than about 3×1020 cm-2, the amount of F I can be determined from λ954. For these two sight lines, there is no clear indication for enhanced F abundances resulting from the ν-process in a region shaped by past supernovae.
Based on observations made with the NASA/CNES/CSA Far Ultraviolet Spectroscopic Explorer (FUSE), which is operated for NASA by the Johns Hopkins University under NASA contract NAS 5-32985.- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 2005
- DOI:
- 10.1086/426778
- arXiv:
- arXiv:astro-ph/0410362
- Bibcode:
- 2005ApJ...619..884F
- Keywords:
-
- ISM: Abundances;
- ISM: Atoms;
- Nuclear Reactions;
- Nucleosynthesis;
- Abundances;
- Stars: Individual: Henry Draper Number: HD 208440;
- Stars: Individual: Henry Draper Number: HD 209339A;
- Astrophysics
- E-Print:
- 17 pages, 4 figures, accepted for publication in ApJ