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The Abundances of Chemical Elements in the Atmospheres of K-supergiants in the Small Magellanic Cloud and Arcturus

Published online by Cambridge University Press:  23 December 2005

Vera Gopka ,
Alexander Yushchenko ,
Sergey Andrievsky ,
Stephane Goriely ,
Svetlana Vasiléva  and
Young W. Kang
Vera Gopka
Affiliation:
Astronomical observatory, Odessa National University, Park Shevchenko, Odessa, 65014, Ukraine email: [email protected], [email protected]
Alexander Yushchenko
Affiliation:
Astronomical observatory, Odessa National University, Park Shevchenko, Odessa, 65014, Ukraine email: [email protected], [email protected] Astrophysical Research Center for the Structure and Evolution of the Cosmos (ARCSEC), Sejong University, Seoul, 143-747, Korea email: [email protected], [email protected]
Sergey Andrievsky
Affiliation:
Astronomical observatory, Odessa National University, Park Shevchenko, Odessa, 65014, Ukraine email: [email protected], [email protected]
Stephane Goriely
Affiliation:
Institut d'Astronomie et d'Astrophysique, Universite Libre de Bruxelles, CP 226, 1050 Brussels, Belgium email: [email protected]
Svetlana Vasiléva
Affiliation:
Astronomical observatory, Odessa National University, Park Shevchenko, Odessa, 65014, Ukraine email: [email protected], [email protected]
Young W. Kang
Affiliation:
Astrophysical Research Center for the Structure and Evolution of the Cosmos (ARCSEC), Sejong University, Seoul, 143-747, Korea email: [email protected], [email protected]
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Abstract

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The results of a spectrum synthesis analysis of elemental abundances derived from the high-resolution CCD-spectrograms of the SMC red supergiant stars PMMR23 and PMMR39 (stars 23 & 39 in the catalogue Prevot et al. 1983) are presented. The abundances of 35 elements in the atmosphere of PMMR23 have been obtained. Elements with atomic numbers Z<56 are deficient with respect to the solar abundances. The mean underabundance is about –0.7 dex. The abundances of elements heavier than barium are close to the solar value. In the case of PMMR23, the atmosphere is enriched in elements heavier than barium which show abundances close to the solar value. These abundances can be explained as a combination of r- and s-processes. In PMMR39, all the 20 studied elements present abundances deficient with respect to solar values The abundances of 31 elements with Z>30 are determined in the atmosphere of Arcturus.

Keywords

stars: abundancesstars: individual (PMMR23, PMMR39, Arcturus)nucleosynthesisgalaxies: stellar contentgalaxies: individual (Small Magellanic Cloud)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 535 - 536
Copyright
© 2005 International Astronomical Union