Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-20T00:29:47.005Z Has data issue: false hasContentIssue false
  • English
  • Français

Resonance broadening and van der waals broadening

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: [email protected]
Get access

Abstract

Resonance broadening is important for the hydrogen lines in the spectra of F-type and later stars. In the corresponding temperature regime, the extended wings of the Balmer lines are used as a stellar effective temperature indicator. We show the effect of the use of two broadening theories, Ali & Griem (1965, 1966) and Barklem et al. (2000a, 2000b), on the effective temperature derived in non-LTE from Hα and Hβ in the Sun and the metal-poor star HD19445. Van der Waals broadening is important for strong spectral lines in the atmospheres of F-type and later stars. For the selected transitions in Ca I and Ca II, line profile comparisons are made between applying the van der Waals damping constants from laboratory measurements, the ABO perturbation theory, and the classic Unsöld approximation.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 43: Non-LTE Line Formation for Trace Elements in Stellar Atmospheres , 2010 , pp. 135 - 141
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
Anstee, S.D., & O’Mara, B.J., 1991, MNRAS, 253, 549 CrossRef
Anstee, S.D., & O’Mara, B.J., 1995, MNRAS, 276, 859 CrossRef
Barklem, P.S., & Aspelund-Johansson, J., 2005, A&A, 435, 373
Barklem, P.S., & O’Mara, B.J., 1997, MNRAS, 290, 102 CrossRef
Barklem, P.S., & O’Mara, B.J., 1998, MNRAS, 300, 863 CrossRef
Barklem, P.S., O’Mara, B.J., & Ross, J.E., 1998, MNRAS, 296, 1057 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
Barklem, P.S., Stempels, H.C., Allende Prieto, C., et al., 2002, A&A, 385, 951
Fuhrmann, K.,Pfeiffer, M.,Frank, C., et al., 1997, A&A, 323, 909
Kerkeni, B.,Barklem, P.S.,Spielfiedel, A., & Feautrier, N., 2004, J. Phys. B, 37, 677 CrossRef
Kurucz, R.L., 1992, CD-ROM No. 18, Smithsonian Astrophysical Observatory
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.,Korn, A.J., & Przybilla, N., 2007, A&A, 461, 261
Mashonkina, L.I.,Zhao, G.,Gehren, T., et al., 2008, A&A, 478, 529
Smith, G., 1981, A&A, 103, 351 PubMed
Spielfiedel, A., Feautrier, N., Chambaud, G., & Levy, B., 1991, J. Phys. B, 24 4711 CrossRef
Unsöld A., 1955 Physik der Sternatmosphären, 2nd edition (Springer, Berlin - Göttingen - Heidelberg)
Vidal, C.R.,Cooper, J., & Smith, E.W., 1970, JQSRT, 10, 1011 CrossRef
Vidal, C.R., Cooper, J., & Smith, E.W., 1973, ApJS 25, 37CrossRef