Hostname: page-component-77c89778f8-m8s7h Total loading time: 0 Render date: 2024-07-18T22:39:37.170Z Has data issue: false hasContentIssue false
  • English
  • Français

Accurate Collisional Cross-Sections: Important Non-Lte Input Data

Published online by Cambridge University Press:  16 November 2010

R. Monier ,
B. Smalley ,
G. Wahlgren ,
Ph. Stee  and
L. Mashonkina
L. Mashonkina*
Affiliation:
Institute of Astronomy, Russian Academy of Science, Pyatnitskaya 48, 119017 Moscow, Russia. e-mail: lima@inasan.ru
Get access

Abstract

Non-LTE modelling for a particular atom requires accurate collisional excitation and ionization cross-sections for the entire system of transitions in the atom. This review concerns with inelastic collisions with electrons and neutral hydrogen atoms. For the selected atoms, H i and Ca ii, comparisons are made between electron impact excitation rates from ab initio calculations and various theoretical approximations. The effect of the use of modern data on non-LTE modelling is shown. For most transitions and most atoms, hydrogen collisional rates are calculated using a semi-empirical modification of the classical Thomson formula for ionization by electrons. Approaches used to estimate empirically the efficiency of hydrogenic collisions in the statistical equilibrium of atoms are reviewed.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 43: Non-LTE Line Formation for Trace Elements in Stellar Atmospheres , 2010 , pp. 79 - 90
Copyright
© EAS, EDP Sciences 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Ali, A.W., & Griem, H.R., 1965, Phys. Rev., 140A, 1044 CrossRef
Ali, A.W. & Griem, H.R., 1966, Phys. Rev., 144, 366 CrossRef
Allen, C.W., 1973, Astrophysical Quantities (Athlone Press)
Allende Prieto, C., Asplund, M., & Fabiani Bendicho, P., 2004, A&A, 423, 1109
Barklem, P.S., 2007, A&A, 466, 327
Barklem, P.S., & O’Mara, B.J., 2000, MNRAS, 311, 535 CrossRef
Barklem, P.S., Piskunov, N., & O’Mara, B.J., 2000a, A&A, 355, L5
Barklem, P.S., Piskunov, N., & O’Mara, B.J., 2000b, A&A, 363, 1091
Bely, O., & van Regemorter, H., 1970, ARA&A, 8, 329 CrossRef
Belyaev, A.K.,Grosser, J.,Hahne, J., & Menzel, T., 1999, Phys. Rev., A60, 2151 CrossRef
Belyaev, A.K., & Barklem, P., 2003, Phys. Rev., A68, 062703 CrossRef
Brage, T.,Wahlgren, G.M.,Leckrone, D.S., & Proffitt, C.R., 1998, ApJ, 496, 1051 CrossRef
Burgess, A.,Chidichimo, M.C., & Tully, J.A., 1995, A&A, 300, 627
Drawin, H.W., 1961, Z. Physik, 164, 513 CrossRef
Drawin, H.W., 1968, Z. Physik, 211, 404 CrossRef
Drawin, H.W., 1969, Z. Physik, 225, 483 CrossRef
Fleck, I., Grosser, J., Schnecke, A., et al., 1991, J. Phys. B24, 4017
Fuhrmann, K.,Pfeiffer, M.,Frank, C., et al., 1997, A&A, 323, 909
Gehren, T., 1975, A&A, 38, 289
Gehren, T.,Liang, Y.C.,Shi, J.R., et al., 2004, A&A, 413, 1045
Gratton, R.G.,Carretta, E.,Eriksson, K., & Gustafsson, B., 1999, A&A, 350, 955
Grevesse, N.,Noels, A., & Sauval, A.J., 1996, ASP Conf. Ser., 99, 117
Johnson, L.C., 1972, ApJ, 174, 227 CrossRef
Kurucz, R.L., Furenlid, I., Brault, J., & Testerman, L., 1984, Solar Flux Atlas from 296 to 1300 nm. Nat. Solar Obs., Sunspot, New Mexico
Mashonkina, L.I., 1996, in Model Atmospheres and Spectrum Synthesis, ASP Conf. Ser., 108, 140
Mashonkina, L., 2010, EAS Pupl. Ser., 43, 79 CrossRef
Mashonkina, L.I., & Gehren, T., 2000, A&A, 364, 249
Mashonkina, L.I., & Gehren, T., 2001, A&A, 376, 232
Mashonkina, L.I.,Korn, A.J., & Przybilla, N., 2007, A&A, 461, 261
Mashonkina, L.I.,Zhao, G.,Gehren, T., et al., 2008, A&A, 478, 529
Meléndez, M.,Bautista, M.A., & Badnell, N.R., 2007, A&A, 469, 1203
Mihajlov, A.A.,Dimitrijević, M.S., & Djurić, Z., 1996, Phys. Scr., 53, 159 CrossRef
Mihajlov, A.A.,Ignjatović, L.M.,Djurić, Z., & Ljepojević, N.N., 2004, J. Phys. B., 37, 4493 CrossRef
Mihalas, D., Heasley, J.N., & Auer, L.H., 1975, A Non-LTE Model Stellar Atmospheres Computer Program, NCAR-TN/STR 104
Park, C., 1971, JQSRT, 11, 7 CrossRef
Pradhan, A.K., & Zhang, H.L., 2001, in Landolt-Boernstein Vol. 17 Photon and Electron Interactions with Atoms, Molecules, Ions (Springer-Verlag), 1
Przybilla, N., & Butler, K., 2004a, ApJ, 609, 1181 CrossRef
Przybilla, N., & Butler, K., 2004b, ApJ, 610, L61 CrossRef
Seaton, M.J., 1962a, Proc. Phys. Soc. London, 79, 1105 CrossRef
Seaton, M.J., 1962b, in Atomic and Molecular Processes, ed. D.R. Bates (Academic Press, New York)
Sobelman, I.I., Vainshtein, L.A., & Yukov, E.A., 1981, Excitation of Atoms and Broadening of Spectral Lines, Springer Series Chem. Phys. 7 (Springer, Berlin, Heidelberg, New York)
Steenbock, W., & Holweger, H., 1984, A&A, 130, 319
Takeda, Y., 1995, Publ. Astron. Soc. Japan, 47, 463
Thevenin, F., & Idiart, T.P., 1999, ApJ, 521, 753 CrossRef
van Regemorter, H., 1962, ApJ, 136, 906 CrossRef
Zhang, H.W.,Butler, K.,Gehren, T., et al., 2006a, A&A, 453, 723 PubMed
Zhang, H.W.,Gehren, T.,Butler, K., et al., 2006b, A&A, 457, 645