Journal
ASTROPHYSICAL JOURNAL
Volume 764, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/764/2/115
Keywords
galaxies: abundances; line: formation; radiative transfer; stars: abundances; stars: late-type; supergiants
Categories
Funding
- National Science Foundation [AST-1108906]
- Alexander-von-Humboldt Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1108906] Funding Source: National Science Foundation
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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.
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