SIMBAD references

2013ApJ...764..115B - Astrophys. J., 764, 115 (2013/February-3)

Red supergiant stars as cosmic abundance probes. II. NLTE effects in j-band silicon lines.

BERGEMANN M., KUDRITZKI R.-P., WURL M., PLEZ B., DAVIES B. and GAZAK Z.

Abstract (from CDS):

Medium-resolution J-band spectroscopy of individual red supergiant stars is a promising tool to investigate the chemical composition of the young stellar population in star-forming galaxies. As a continuation of recent work on iron and titanium, detailed non-LTE (NLTE) calculations are presented to investigate the influence of NLTE on the formation of silicon lines in the J-band spectra of red supergiants. Substantial effects are found resulting in significantly stronger absorption lines of neutral silicon in NLTE. As a consequence, silicon abundances determined in NLTE are significantly smaller than in local thermodynamic equilibrium (LTE) with the NLTE abundance corrections varying smoothly between -0.4 dex and -0.1 dex for effective temperatures between 3400 K and 4400 K. The effects are largest at low metallicity. The physical reasons behind the NLTE effects and the consequences for extragalactic J-band abundance studies are discussed.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - line: formation - radiative transfer - stars: abundances - stars: late-type - supergiants

Simbad objects: 2

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2021.04.23-04:46:34

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