Abstract
A study of the solar Ba ii spectrum leads to a solar abundance of barium of logε ba = = 2.11±0.12, on the scale logε h = 12. The observed asymmetry of the resonance line λ4554 is consistent with an isotopic abundance ratio equal to the terrestrial one. The meteoritic Ba/Si abundance ratio found in carbonaceous chondrites appears to exceed the solar ratio by 0.1 to 0.2 dex (Section 5).
The broadening by collisions with hydrogen atoms is determined from the solar spectrum (Section 4). Damping half-widths, γ h, of the three stronger Ba ii lines turn out to be larger by a factor of about 3.0 than predicted from pure van der Waals interaction of dipoles.
Departures from LTE appear to be present in the cores of the resonance lines and of the lines arising from the metastable 5D levels (Section 6). The equivalent widths, however, remain practically unaffected.
Equivalent widths of neutral barium lines are predicted and some new identifications of photospheric Ba i lines are suggested (Section 7).
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References
Anders, E.: 1971, Ann. Rev. Astron. Astrophys. 9, 1.
Banks, H. W., Bozman, W. R., and Wilson, Ch. M.: 1967, Georgetown Obs. Monograph No. 20.
Brault, J. and Testerman, L.: 1972, Preliminary Edition of the Kitt Peak Solar Atlas, Kitt Peak National Observatory, Tucson, Arizona.
Brix, P. and Kopfermann, H.: 1952, Landolt-Börnstein I/5, Springer, Berlin-Göttingen-Heidelberg.
Brueckner, K. A.: 1971, Astrophys. J. 169, 621.
Delbouille, L. and Roland, G.: 1963, Atlas photométrique du spectre solaire de λ7498 à λ12016, Institut d'Astrophysique de l'Université de Liège, Liège.
Delbouille, L., Roland, G., and Neven, L.: 1973, Atlas photométrique du spectre solaire de λ3000 à λ10000, Institut d'Astrophysique de l'Université de Liège, Cointe-Ougrée.
Dunn, R. B., Evans, J. W., Jefferies, J. T., Orrall, F. Q., White, O. R., and Zirker, J. B.: 1968, Astrophys. J. Suppl. 15, 275.
Gallagher, A.: 1967, Phys. Rev. 157, 24.
Garz, T.: 1973, Astron. Astrophys. 26, 471.
Garz, T., Holweger, H., Kock, M., and Richter, J.: 1969, Astron. Astrophys. 2, 446.
Gingerich, O., Noyes, R. W., Kalkofen, W., and Cuny, Y.: 1971, Solar Phys. 18, 347.
Goldberg, L., Müller, E. A., and Aller, L. H.: 1960, Astrophys. J. Suppl. 5, 1.
Griffin, R. F.: 1968, A Photometric Atlas of the Spectrum of Arcturus, Cambridge Philosophical Society, Cambridge.
Harrison, G. R.: 1939, Wavelength Tables, Mass. Inst. Technology, Wiley, New York.
Holweger, H.: 1967, Z. Astrophys. 65, 365.
Holweger, H.: 1972, Solar Phys. 25, 14.
Holweger, H.: 1973, Astron. Astrophys. 26, 275.
Jäger, H.: 1969, Z. Physik 223, 19.
Kiess, C. C., Rubin, V. C., and Moore, Ch. E.: 1961, J. Res. Nat. Bur. Stand. 65A, 1.
Kurucz, R. L.: 1974, Solar Phys. 34, 17.
Labs, D. and Neckel, H.: 1968, Z. Astrophys. 69, 1.
Labs, D. and Neckel, H.: 1970, Solar Phys. 15, 79.
Labs, D. and Neckel, H.: 1972, Solar Phys. 22, 64.
Lambert, D. L. and Warner, B.: 1968, Monthly Notices Roy. Astron. Soc. 140, 197.
Lewis, E. L., McNamara, L. F., and Michels, H. H.: 1971, Phys. Rev. A3, 1939.
Lites, B.: 1973, Solar Phys. 32, 283.
May, M., Richter, J., and Wichelmann, J.: 1974, Astron. Astrophys., to be published.
Miles, B. M. and Wiese, W. L.: 1969, Nat. Bur. Stand. Technical Note 474.
Moore, C. B.: 1971, in B. Mason (ed.), Handbook of Elemental Abundances in Meteorites, Gordon and Breach, New York, p. 125.
Moore, Ch. E.: 1959, Nat. Bur. Stand. Technical Note 36.
Moore, Ch. E., Minnaert, M. G. J., and Houtgast, J.: 1966, Nat. Bur. Stand. Monograph 61.
Murakawa, K.: 1932, Sci. Pap. Inst. Phys. Chem. Res. Tokyo 18, 304.
Pierce, A. K.: 1968, Astrophys. J. Suppl. 17, 1.
Reed, G. W., Kigoshi, K., and Turkevich, A.: 1960, Geochim. Cosmochim. Acta 20, 122.
Ritschl, R. and Sawyer, R. A.: 1931, Z. Physik 72, 36.
Roueff, E.: 1972, Phys. Letters 38A, 8.
Roueff, E. and Van Regemorter, H.: 1969, Astron. Astrophys. 1, 69.
Unsöld, A.: 1955, Physik der Sternatmosphären, Springer, Berlin-Göttingen-Heidelberg.
Urey, H. C.: 1967, Quart. J. Roy. Astron. Soc. 8, 23.
Warner, B.: 1968, Monthly Notices Roy. Astron. Soc. 139, 115.
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Holweger, H., Müller, E.A. The photospheric barium spectrum: Solar abundance and collision broadening of Baii lines by hydrogen. Sol Phys 39, 19–30 (1974). https://doi.org/10.1007/BF00154968
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DOI: https://doi.org/10.1007/BF00154968