The boron absorption line at 2089.6 Å in HD 140283?
Abstract
We have observed the B i line at 2089.6 Å in the metal poor star HD 140283 with HST/STIS. The observation was an attempt to confirm the B abundances derived from the 2497 Å B i line in earlier works in general, and for for this star in particular (Edvardsson et al. 1994; Kiselman & Carlsson 1996). The resulting spectrum gained from 8 orbits of observations is hardly consistent with the boron abundance derived in the earlier works. A pure 10B line could produce the feature observed but no reasonable process can produce such a ratio between 10B and 11B. More likely the analysed feature is affected by a statistical fluctuation. A conservative upper limit estimate of the NLTE corrected boron abundance gives a value marginally consistent with that derived from the 2497 Å line. We are proposing further observations to derive a more definite abundance from the line. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under contract NAS 5-26555
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 2000
- DOI:
- 10.48550/arXiv.astro-ph/0011269
- arXiv:
- arXiv:astro-ph/0011269
- Bibcode:
- 2000A&A...363L..33T
- Keywords:
-
- STARS: ABUNDANCES;
- STARS: POPULATION II;
- STARS: INDIVIDUAL: HD 140283;
- GALAXY: ABUNDANCES;
- Astrophysics
- E-Print:
- 4 pages, latex, 2 figures, Accepted for publication in A&