The Last GHRS Observation: The Boron Abundance of the Orion Association G-Dwarf BD-06 1250

Details The Last GHRS Observation: The Boron Abundance of the Orion Association G-Dwarf BD-06 1250 The Last GHRS Observation: The Boron Abundance of the Orion Association G-Dwarf BD-06 1250

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.7306c&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #73.06; Bulletin of the American Astronomical Society, Vol. 30, p.1362

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Scientific paper

We present the boron abundance for the Orion association G-dwarf member BD-06 1250 (Parenago 2339) derived from the B I 2497 Angstroms resonance lines. These spectra were obtained with the HST GHRS and represent the last data obtained with the GHRS, which failed while observing this star. Although only 1/3 of the planned spectra were obtained before the failure, an accurate B abundance could be derived. These observations are part of an ongoing program to probe boron in the young low-mass Orion association members. We derive a boron abundance of log (B/H) + 12. = 2.5 for BD-06 1250, which is roughly 0.2-0.3 dex below solar. The B abundance for this Orion G-dwarf is also lower, by about the same amount, in comparison to the boron abundances found for four Orion main-sequence B-stars. When these results are combined with the boron abundances derived from another Orion G-dwarf (BD-05 1317), as well as the ISM value into Orion, there is evidence for boron variation within the Orion association. Implications of such a variation will be discussed within the context of cosmic-ray fluxes and supernova neutrino induced nucleosynthesis.

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