Award Abstract #0406784
An Intensive Search for r-process-Enhanced Stars, and Abundance Patterns in the Early Galaxy

NSF Org:	AST Division of Astronomical Sciences
Initial Amendment Date:	July 12, 2004
Latest Amendment Date:	June 9, 2006
Award Number:	0406784
Award Instrument:	Continuing grant
Program Manager:	Brian M. Patten AST Division of Astronomical Sciences MPS Directorate for Mathematical & Physical Sciences
Start Date:	July 15, 2004
Expires:	June 30, 2007 (Estimated)
Awarded Amount to Date:	$313961
Investigator(s):	Timothy Beers beers@pa.msu.edu (Principal Investigator)
Sponsor:	Michigan State University CONTRACT AND GRANT ADMINISTRATIO EAST LANSING, MI 48824 517/355-5040
NSF Program(s):	GALACTIC ASTRONOMY PROGRAM
Field Application(s):
Program Reference Code(s):	OTHR, 1207, 0000
Program Element Code(s):	1216

ABSTRACT

An Intensive Search for r-process-Enhanced Stars, and Abundance Patterns in the Early Galaxy

ABSTRACT

AST 0406784 Timothy Beers

Dr. Timothy Beers, at Michigan State University, will undertake a program to complete a large-scale search for very metal-poor stars in the halo of the Galaxy that, based on a rapid sequence of neutron absorptions in nuclear reactions, are referred to as highly "rapid-process-enhanced", or "r-process-enhanced" stars. Highly r-process-enhanced, very metal-poor stars provide a means to investigate the nature of the r-process itself in the early Galaxy, the sites for the production of the r-process elements and the age of the Galaxy. This latter effort is significant because the PI uses a method that is independent of precise knowledge of stellar evolution, chemical evolution of the Galaxy, and cosmological models. The proposal also seeks support for the analysis of the chemical elemental abundances for the large sample of low metallicity giants that are the candidates for the search.

The research will have broad impact on a number of research areas, including astronomy, nuclear physics, and chemistry. Opportunities for traini

PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

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Aoki, W., Beers, T.C., Christlieb, N., Norris, J.E., Ryan, S.G., & Tsangarides, S..  "Carbon-Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars,"  Astrophysical Journal,  v.655,  2006,  p. 492.

Aoki, W., Bisterzo, S., Gallino, R., Beers, T.C., Norris, J.E., Ryan, S.G., & Tsangarides, S..  "Carbon-Enhanced Metal-Poor Stars. II. Osmium and Iridium Abundances in the Neutron-Capture-Enhanced Subgiants CS 31062-050 and LP 625-44,"  Astrophysical Journal (Letters),  v.650,  2006,  p. L127.

Aoki, W., Frebel, A., Christlieb, N., Norris, J.E., Beers, T.C., et al..  "HE 1327-2326, An Unevolved Star with [Fe/H] < -5.0. I. A Comprehensive Abundance Analysis,"  Astrophysical Journal, 639, 897,  v.639,  2006,  p. 897.

Barklem, P.S., Christlieb, N., Beers, T.C., Hill, V., Holmberg, J., Marsteller, B., Rossi, S., & Zickgraf, F.-J..  "Hamburg/ESO R-process Enhanced Star Survey (HERES). II. Spectroscopic Analysis of the Survey Sample,"  Astronomy & Astrophysics,  v.439,  2005,  p. 129.

Beers, T.C., Christlieb, N., & Hill, V..  "Efficient Searches for r-Process-Enhanced, Metal-Poor Stars,"  Nuclear Physics, A,  v.758,  2005,  p. 595.

Beers, T.C., et al..  "Broadband UBVRI Photometry of Field Horizontal-Branch and A-type Stars, and Metal-Poor Candidates from the HK and Hamburg/ESO Surveys. I.,"  Astrophysica Journal (Suppl),  v.168,  2007,  p. 128.

Beers, T.C., Sivarani, T., Marsteller, B., Lee, Y., Rossi, S., & Plez, B..  "Near-Infrared Spectroscopy of Carbon-Enhanced Metal-Poor Stars. I. A SOAR/OSIRIS Pilot Study,"  Astronomical Journal,  v.133,  2007,  p. 1193.

Christlieb, N., Beers, T.C, Barklem, P., Bessell, M., Holmberg, J., Korn, A., Marsteller, B., Mashonkina, L., et al..  "Hamburg/ESO R-process Enhanced Star Survey (HERES). I. Project Description, and Discovery of Two Stars with Strong Enhancements of Neutron-Capture Elements,"  Astronomy & Astrophysics,  v.428,  2004,  p. 1027.

Frebel, A. Norris, J.E., Aoki, W., Honda, S., Bessell, M.S., Takada-Hidai, M., Beers, T.C., & Christlieb, N..  "Chemical Abundance Analysis of the Extremely Metal-Poor Star HE 1300+0157,"  Astrophysical Journal,  v.658,  2007,  p. 534.

Frebel, A., Christlieb, N., Norris, J.E., Thom, C., Beers, T.C., & Rhee, J..  "Discovery of a Strongly r-Process Enhanced Metal-Poor Star with Detected Uranium,"  Astrophysical Journal (Letters),  v.600,  2007,  p. L117.

Goswami, A., Aoki, W., Beers, T.C, Christlieb, N., Norris, J.E., Ryan, S.G., & Tsangarides, S..  "A High-Resolution Analysis of Three Carbon-Enhanced Metal-Poor Stars,"  Monthly Notices of the Ryal Astronomical Society,  v.372,  2006,  p. 343.

Johnson, J.A., Herwig, F., Beers, T.C., & Christlieb, N..  "A Search For Nitrogen-Enhanced Metal-Poor Stars,"  Astrophysical Journal,  v.658,  2007,  p. 1203.

Jonsell, K., Barklem, P.S., Bustafsson, B., Christlieb, N., Hill, V., Beers, T.C., & Holmberg, J..  "The Hamburg/ESO R-process Enhanced Star Survey (HERES). III. HE 0338-3945 and the Formation of Stars Enriched in Both s-Elements and Europium,"  Astronomy & Astrophysics,  v.45,  2006,  p. 651.

Lucatello, S., Beers, T.C., Christlieb, N., Barklem, P.S., Rossi, S., Marsteller, B., Sivarani, T., & Lee, Y..  "The Frequency of Carbon-Enhanced Metal-Poor Stars in the Galaxy from the HERES Sample,"  Astrophysical Journal (Letters),  2006,  p. L37.

Masseron, T., Van Eck, S., Famaey, B., Goriely, S., Plez, B., Siess, L.,Beers, T.C., Primas, F., & Jorissen, A..  "CS 30322-023: An Extremely Metal-Poor Thermally Pulsing AGB Star ?,"  Astronomy & Astrophysics,  2006,  p. 1059.

Rossi, S., Beers, T.C., Sneden, C., Sevastyanenko, Y., Rhee, J., & Marsteller, B..  "Estimation of Carbon Abundances in Metal-Poor Stars, I. Applicaton to the `Strong G-Band' Stars of Beers, Preston, & Shectman,"  Astronomical Journal,  v.130,  2005,  p. 2804.

Wanajo, S., Nomoto, K., Iwamoto, N., Ishimaru, Y., & Beers, T.C..  "Enrichment of Very Metal-Poor Stars with Both r-Process and s-Process Elements from 8- 10 Mo Stars,"  Astrophysical Journal,  v.636,  2006,  p. 842.


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