Hostname: page-component-76fb5796d-5g6vh Total loading time: 0 Render date: 2024-04-30T05:59:27.669Z Has data issue: false hasContentIssue false

Interpretations of Stellar Spectra: NLTE Effects

Published online by Cambridge University Press:  30 March 2016

Yakiv V. Pavlenko*
Affiliation:
The Principal Astronomical Observatory of the National Academy of Sciences, Golosiiv, Kyiv 252650 Ukraine

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

To solve the system of statistical balance equations and radiative transfer equations (NLTE problem) we followed the modification of linearization method proposed by Auer and Heasley (1976) and used 20-level model of the lithium atom. The 70 radiative and all possible collisional transitions were included into the rate matrix (Pavlenko 1994).

Type
II. Joint Discussions
Copyright
Copyright © Kluwer 1995

References

Auer, L.H., Heasley, I.N. (1976) An alternative formulation of non-LTE transfer problem. Astrophys. J., v. 205, pp. 165171. CrossRefGoogle Scholar
Carlsson, M., Rutten, R.J., Bruls, R.H.M.J., Shchukina, N.G. (1994) The non-LTE formation of Li I lines in cool stars, Prepr. of Inst. of Theoret. Astrophys., Oslo, no.17, pp. 0124. Google Scholar
Magazzù, A., Rebolo, R., Pavlenko, Ya.V., (1992) Lithium abundances in classical and weak T Tauri stars Astrophys. J., v. 392, pp. 159171. Google Scholar
Martín, E.L., Rebolo, R., Magazzù, A., Pavlenko, Ya.V. (1994) Pre-main sequence lithium burning. I. Weak T Tauri stars Asrton. & Astrophys., v. 282, pp. 503517. Google Scholar
Pavlenko, Ya.V. Statistical equilibrium of the lithium in different metallicity dwarfs atmospheres with T eff = 5770K, log g = 4.44. (1994) Astrophys. Lett., in pressGoogle Scholar
Rebolo, R. Molaro, P., Beekman, J.E. (1988) Lithium abundances in metal-deficient dwarfs Astron. & Astrophys., v. 192, pp. 192205. Google Scholar
Spite, F., Spite, M. (1982) Abundance of lithium in unevolved halo stars and Old disk stars: Interpretations and consequences. Astron. & Astrophys., v. 115, pp. 357366. Google Scholar
Thorburn, J.A. (1994) The Primordial Lithium Abundance from Extreme Subdwarfs: New Observations. Astrophys. J., v. 421, pp. 318335.Google Scholar