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Carbon-Enhanced, Metal-Poor Stars and Modeling of the Asymptotic Giant Branch

Published online by Cambridge University Press:  05 March 2013

Sara Lucatello ,
Thomas Masseron  and
Jennifer A. Johnson
Sara Lucatello*
Affiliation:
Excellence Cluster Universe, Technische Universität München, Boltzmannstr. 2, D-85748, Garching, Germany INAF-Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122, Padova, Italy
Thomas Masseron
Affiliation:
Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
Jennifer A. Johnson
Affiliation:
Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA
*
DCorresponding author. Email: [email protected]
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Abstract

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The very high fraction of C-enriched stars among the low end of the Galactic-halo metallicity distribution, along with the wide variety in content of their neutron-capture elements, make the understanding of their formation scenario(s) of extreme interest. The combination of accurate determinations of their chemical composition with long-term radial-velocity monitoring is crucial to address this issue. We discuss the first results of long-term radial-velocity monitoring for C-enhanced, metal-poor stars and explore the connection with chemical peculiarities; the data suggest that belonging to a close binary affects nucleosynthesis on the Asymptotic Giant Branch. We also present abundances for the poorly studied element fluorine in a sample of 10 C-enhanced stars with metallicities ranging from [Fe/H] = –1.3 to –2.9 and compare our measurements to the predictions of state-of-the-art nucleosynthesis models. We show how the observed abundances of fluorine in CEMP stars are considerable lower than expected on the basis of the current state-of-the-art theoretical calculations, hinting at our poor understanding of the nucleosynthetic processes that produce this element.

Keywords

binaries: generalstars: AGB and post AGBstars: carbon
Type
CEMP Stars
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 303 - 310
Copyright
Copyright © Astronomical Society of Australia 2009

References

Aoki, W., Norris, J. E., Ryan, S. G., Beers, T. C. & Ando, H., 2000, ApJ, 536, L97 Google Scholar
Aoki, W., Ryan, S. G., Norris, J. E., Beers, T. C., Ando, H. & Tsangarides, S., 2002, ApJ, 580, 1149 Google Scholar
Aoki, W., Beers, T. C., Christlieb, N., Norris, J. E., Ryan, S. G. & Tsangarides, S., 2007, ApJ, 655, 492 CrossRefGoogle Scholar
Barbuy, B., Spite, M., Spite, F., Hill, V., Cayrel, R., Plez, B. & Petitjean, P., 2005, A&A, 429, 1031 Google Scholar
Barklem, P. S. et al., 2005, A&A, 439, 129 Google Scholar
Beers, T. C. & Christlieb, N., 2005, ARA&A, 43, 531 Google Scholar
Beers, T., 2006, Russbach Meeting. Available at http://www.uni-mainz.de/Organisationen/vistars/talks_russbah2006/russbah2006_beers.pdf Google Scholar
Beers, T. C., Sivarani, T., Marsteller, B., Lee, Y., Rossi, S. & Plez, B., 2007, AJ, 133, 1193 Google Scholar
Busso, M., Gallino, R., Lambert, D. L., Travaglio, C. & Smith, V.V., 2001, ApJ, 557, 802 Google Scholar
Cohen, J. G. et al., 2006, AJ, 132, 137 Google Scholar
Cristallo, S., Straniero, O., Lederer, M. T. & Aringer, B., 2007, ApJ, 667, 489 Google Scholar
Frebel, A. et al., 2006, ApJ, 652, 1585 Google Scholar
Fujimoto, M. Y., Ikeda, Y. & Iben, I. J., 2000, ApJ, 529, L25 Google Scholar
Gallino, R., Arlandini, C., Busso, M., Lugaro, M., Travaglio, C., Straniero, O., Chieffi, A. & Limongi, M., 1998, ApJ, 497, 388 Google Scholar
Gallino, R., Delaude, D., Husti, L., Cristallo, S., Straniero, O. & Ryan, S., 2005, NuPhA, 758, 485 Google Scholar
Hill, V. et al., 2000, A&A, 353, 557 Google Scholar
Ivans, I. I., Sneden, C., Gallino, R., Cowan, J. J. & Preston, G. W., 2005, ApJ, 627, L145 Google Scholar
Johnson, J. A. & Bolte, M., 2004, ApJ, 605, 462 Google Scholar
Johnson, J. A., Herwig, F., Beers, T. C. & Christlieb, N., 2007, ApJ, 658, 1203 CrossRefGoogle Scholar
Jorissen, A., Smith, V. V. & Lambert, D. L., 1992, A&A, 261, 164 Google Scholar
Karakas, A. & Lattanzio, J. C., 2007, PASA, 24, 103 CrossRefGoogle Scholar
Karakas, A. I., Lee, H. Y., Lugaro, M., Görres, J. & Wiescher, M., 2008, ApJ, 676, 1254 CrossRefGoogle Scholar
Lau, H. H. B., Stancliffe, R. J. & Tout, C. A., 2008, MNRAS, 385, 301 Google Scholar
Lucatello, S., Gratton, R., Cohen, J. G., Beers, T. C., Christlieb, N., Carretta, E. & Ramírez, S., 2003, AJ, 125, 875 Google Scholar
Lucatello, S., Tsangarides, S., Beers, T. C., Carretta, E., Gratton, R. G. & Ryan, S. G., 2005, ApJ, 625, 825 CrossRefGoogle Scholar
Lucatello, S., Beers, T. C., Christlieb, N., Barklem, P. S., Rossi, S., Marsteller, B., Sivarani, T. & Lee, Y. S., 2006, ApJ, 652, L37 Google Scholar
Lugaro, M., Ugalde, C., Karakas, A. I., Görres, J., Wiescher, M., Lattanzio, J. C. & Cannon, R. C., 2004, ApJ, 615, 934 Google Scholar
Lugaro, M. et al., 2008, A&A, 484, L27 Google Scholar
Marigo, P., 2002, A&A, 387, 507 Google Scholar
Masseron, T. & Johnson, J. A., 2008, in International Symposium on Nuclear Astrophysics, Nuclei in the Cosmos, PoS(NIC-X)072Google Scholar
Masseron, T., Johnson, J. A., Plez, B., Van Eck, S., Primas, F., Goriely, S. & Jorissen, A., 2009, A&A, submitted (astro-ph/0901.4737)Google Scholar
McClure, R. D., 1984a, PASP, 96, 117 Google Scholar
McClure, R. D., 1984b, ApJ, 280, L31 Google Scholar
Meynet, G. & Arnould, M., 2000, A&A, 355, 176 Google Scholar
Norris, J. E., Ryan, S. G. & Beers, T. C., 1997, ApJ, 488, 350 Google Scholar
Newberg, H. J. & Sloan Digital Sky Survey Collaboration, 2003, BAAS, 35, 1385 Google Scholar
Nollett, K. M., Busso, M. & Wasserburg, G. J., 2003, ApJ, 582, 1036 Google Scholar
Preston, G. W. & Sneden, C., 2001, AJ, 122, 1545 Google Scholar
Renda, A. et al., 2004, MNRAS, 354, 575 Google Scholar
Ryan, S. G., Aoki, W., Norris, J. E. & Beers, T. C., 2005, ApJ, 635, 349 Google Scholar
Schuler, S. C., Cunha, K., Smith, V. V., Sivarani, T., Beers, T. C. & Lee, Y. S., 2007, ApJ, 667, L81 Google Scholar
Schuler, S., Cunha, K., Smith, V.V., Sivarani, T. & Beers, T.C., 2008, in International Symposium on Nuclear Astrophysics, Nuclei in the Cosmos, PoS(NIC-X)072Google Scholar
Sivarani, T. et al., 2006, A&A, 459, 125 Google Scholar
Smith, V. V., Cunha, K., Ivans, I. I., Lattanzio, J. C., Campbell, S. & Hinkle, K. H., 2005, ApJ, 633, 392 Google Scholar
Sneden, C. et al., 2003, ApJ, 591, 936 CrossRefGoogle Scholar
Stancliffe, R. J., Glebbeek, E., Izzard, R. G. & Pols, O. R., 2007, A&A, 464, L57 Google Scholar
Stancliffe, R. J. & Glebbeek, E., 2008, MNRAS, 389, 1828 Google Scholar
Stancliffe, R. J., 2009, MNRAS, 394, 1051 Google Scholar
Tsangarides, S., Ryan, S. G. & Beers, T. C., 2004, MmSAI, 75, 772 Google Scholar
Wanajo, S., 2006, ApJ, 650, L79 Google Scholar
Woosley, S. E. & Haxton, W. C., 1988, Nature, 334, 45 Google Scholar
Zhang, B., Ma, K. & Zhou, G., 2006, ApJ, 642, 1075 Google Scholar
Zijlstra, A. A., 2004, MNRAS, 348, L23 Google Scholar