The NLTE formation of neutral-boron lines in cool stars

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dc.creatorKiselman, Dan
dc.creatorCarlsson, Mats
dc.date1996-01-25
dc.date.accessioned2026-07-07T02:20:49Z
dc.date.available2026-07-07T02:20:49Z
dc.descriptionWe study the formation of B I lines in a grid of cool stellar model atmospheres without the assumption of local thermodynamic equilibrium (LTE). The non-LTE modelling includes the effect of other lines blending with the B I resonance lines. Except for the cases where the B I lines are very strong, the departures from LTE relevant for the resonance lines can be described as an overionisation effect and an optical-pumping effect. This causes the lines to be weaker than in LTE so that an abundance analysis assuming LTE will underestimate stellar boron abundances. We present non-LTE abundance corrections useful to improve on abundances derived from the B I 250 nm and 209 nm lines under the LTE assumption. Application of the results on literature data indicates that the B/Fe ratio in metal-poor stars is constant.
dc.descriptionuuencoded gzipped tar file containing LaTex file (11 pages, l-aa.sty and epsf.sty) and 15 Postscript figures. Also available at ftp://ftp.astro.uio.no/pub/boron together with computer routines for calculation of NLTE abundance corrections. Accepted for publication in Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9601144
dc.identifierhttp://arxiv.org/abs/astro-ph/9601144
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10340
dc.subjectAstrophysics
dc.titleThe NLTE formation of neutral-boron lines in cool stars
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