ENRICHMENT OF THE GALACTIC DISK BY THE NEUTRON CAPTURE ELEMENTS (Ba and Eu)

Автор(и)

  • T. I. Gorbaneva Astronomical Observatory of Odessa National University Marazlievskaya, 1v 65014 Odessa, Ukraine, Ukraine

DOI:

https://doi.org/10.18524/1810-4215.2005.18.98249

Ключові слова:

nucleosythesis, neutron captures, stars, abundances, giants.

Анотація

The abundances of Ba and Eu were determined for 38 red giant stars in the metallicity range -0.6<[Fe/H]<+0.25 using the spectral synthesis technique. The spectra were obtained with spectrograph ELODIE (Haute Provence Observatoire, France), the resolwing power is 42000, S/N is more than 100. For the Ba and Eu lines the effects of hyperfine structure and isotope shifts are included, assuming the isotope ratios of the r-process component of the solar system material. Abundances of the n-capture element (Ba and Eu) for 38 red giants with metallicities [Fe/H] from -0.6 to +0.25 and correlation of the [Ba/Eu] ratios with stellar metallicities are present. The [Ba/Eu] ratio reflects substantial production of Ba in the s-process for the stars with metallicity -0.6<[Fe/H]<+0.25.

Посилання

Arlandini C, Kappeler F., Wisshak K., et al.: 1999. ApJ, 525, 886.

Baranne A., Queloz D., Mayor M., et al.: 1996, A&AS. 119, 373.

Burbidge E.M., Burbidge G.R., Fower W.A., Hoyle F.: 1957, Rev. Mod. Phys., 29, 547.

Burris D.L., Pilachowski C.A., Armandro T.E., et.al.: 2000, ApJ, 544, 302.

Busso M., Gallino R., Wasserburg G.J.: 1999, ARA&A, 37, 239.

Cameron A.G.W.: 1982, Ap&SS, 82, 123.

Galazutdinov G.A.: 1992, Prepr. SAO RAS, 92, 27.

Kappeler F., Beer H., Wisshak K: 1989, Rep. Prog. Phys., 52, 945.

Katz D., Soubiran C, Cayrel R., et. al.: 1998, A&A, 338, 151.

Kovtyukh V.V., Mishenina T.V.,Bienayme O., et. al.: 2006, Astron. Zh., 83, 158.

Kurucz R.L.: 1993, CD ROM n13.

Lamb S., Howard W. M., Truran J. W., Iben I. Jr.: 1977, ApJ, 217, 213.

Mashonkina L., Gehren T., Bikmaev I.: 1999, A&A, 343, 519.

Mashonkina L.I., Gehren T.: 2000, A&A, 364, 249.

Mashonkina L., Gehren T.: 2001, A&A, 376, 232.

Pagel B.E.J.: 1997, Nucl. and Chemic. Evol. Of Galaxies (Cambridge University Press).

Peters J.G.: 1968, ApJ, 154, 225.

Schwarzschild M., Harm R.: 1967, ApJ, 150, 961.

Sneden C, Cowan J.J.: 2003, Science, 299, 70.

Soubiran C, Katz D., Cayrel R.: 1998, A&AS, 133, 221.

Travaglio C, Galli D., Gallino R., et. al.: 1999, ApJ, 521, 691.

Truran J.W., Cowan J.J., Pilachowski C.A., Sneden C: 2002, PASP, 114, 1293.

Tsymbal V.V.: 1996, ASP Conf. Ser., 108, 198.

Wisshak K., Voss F., Kappeler F.: 1996, in Proc. 8th Workshop on Nuclear Astrophysics, ed. W. Hillebrandt, Muller E. (Munich: MPI), 16.

##submission.downloads##

Опубліковано

2017-04-10

Номер

Розділ

Статті