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J/A+A/607/A91             CS 29497-004 abundances                  (Hill+, 2017)

The Hamburg/ESO R-process Enhanced Star survey (HERES). XI. The highly r-process-enhanced star CS 29497-004. Hill V., Christlieb N., Beers T.C., Barklem P.S., Kratz K.-L., Nordstrom B., Pfeiffer B., Farouqi K. <Astron. Astrophys. 607, A91 (2017)> =2017A&A...607A..91H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Spectroscopy ; Abundances ; Equivalent widths Keywords: stars: abundances - stars: individual: CS 29497-004 - stars: Population II - stars: chemically peculiar - Galaxy: halo Abstract: We report an abundance analysis for the highly r-process-enhanced (r-II) star CS 29497-004, a very metal-poor giant with solar system Teff=5013K and [Fe/H]=-2.85, whose nature was initially discovered in the course of the HERES project. Our analysis is based on high signal-to-noise ratio, high-resolution (R∼75000) VLT/UVES spectra and MARCS model atmospheres under the assumption of local thermodynamic equilibrium, and obtains abundance measurements for a total of 46 elements, 31 of which are neutron-capture elements. As is the case for the other ∼25 r-II stars currently known, the heavy-element abundance pattern of CS 29497-004 well-matches a scaled solar system second peak r-process-element abundance pattern. We confirm our previous detection of Th, and demonstrate that this star does not exhibit an "actinide boost". Uranium is also detected (logε(U)=-2.20±0.30), albeit with a large measurement error that hampers its use as a precision cosmochronometer. Combining the various elemental chronometer pairs that are available for this star, we derive a mean age of 12.2±3.7Gyr using the theoretical production ratios from published waiting-point approximation models. We further explore the high-entropy wind model (Farouqi et al., 2010ApJ...712.1359F) production ratios arising from different neutron richness of the ejecta (Ye), and derive an age of 13.7±4.4Gyr for a best-fitting Ye=0.447. The U/Th nuclei-chronometer is confirmed to be the most resilient to theoretical production ratios and yields an age of 16.5±6.6Gyr. Lead (Pb) is also tentatively detected in CS 29497-004, at a level compatible with a scaled solar r-process, or with the theoretical expectations for a pure r-process in this star. Description: High-resolution spectra of CS 29497-004 were obtained with UVES at VLT-UT2 during October-December 2002 and July-August 2003. A total of 22 exposures were obtained with the BLUE346 setting, and six with the BLUE437 setting. In both cases Image Slicer #2 was used, yielding a nominal resolving power of R=λ/Δλ=75000. The total useful wavelength range covered by these two settings is 3050-4980Å in the rest frame of the star. Objects: ------------------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------------------ 00 28 06.92 -26 03 04.2 CS 29497-004 = BPS CS 29497-004 ------------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tableb1.dat 54 279 Neutron-capture elements linelist and individual abundances in CS 29497-004
See also: J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005) J/A+A/516/A46 : HERES V. HE 2327-5642 abundance analysis (Mashonkina+, 2010) J/A+A/528/A92 : HERES VI. Galactic chemical evolution of Si & C (Zhang+, 2011) Byte-by-byte Description of file: tableb1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Species Species 7- 14 F8.3 0.1nm lambda Wavelength 16- 19 F4.2 eV EP Energy potential 21- 26 F6.3 [-] loggf Oscillator strength 28- 29 I2 --- r_loggf Reference for loggf (1) 31 I1 --- r_HFS ? Reference for hyperfine splitting parameters used (2) 33- 36 F4.1 0.1pm EW ? Equivalent width 38- 40 A3 --- n_EW [syn] syn for synthetic 41 A1 --- --- [(] 42- 46 F5.1 0.1nm EWsyn ? Synthetic equivalent width 47 A1 --- --- [)] 49- 54 F6.3 [-] logeps Abundance
Note (1): References for log gf sources as follows: 1 = Sneden et al. (2003ApJ...591..936S) 2 = Sneden et al. (1996ApJ...467..819S) 3 = Cowley & Corliss (1983MNRAS.203..651C) 4 = Biemont et al. (1981ApJ...248..867B) 5 = Biemont et al. (1984A&A...131..364B) 6 = Hannaford et al. (1985A&A...143..447H) 7 = Whaling & Brault (1988, Phys. Scr, 38, 707) 8 = Salih & Lawler (1985, Journal of the Optical Society of America B Optical Physics, 2, 422) 9 = Kwiatkowski et al. (1982A&A...112..337K) 10 = Duquette & Lawler (1985, Journal of the Optical Society of America B Optical Physics, 2, 1948) 11 = Corliss & Bozman (1962, Experimental transition probabilities for spectral lines of seventy elements; derived from the NBS Tables of spectral-line intensities) 12 = Migdalek (1978, J. Quant. Spec. Radiat. Transf., 20, 81) 13 = Miles & Wiese (1969, Atomic Data, 1, 1) 14 = McWilliam (1998AJ....115.1640M) 15 = Lawler et al. (2001ApJ...556..452L) 16 = DREAM database (Palmeri et al. 2000, Phys. Scr, 61, 323) 17 = Ivarsson et al. (2001. Phys. Scr, 64, 455) 18 = Den Hartog et al. (2003ApJS..148..543D) 19 = Lawler et al. (2006, Cat. J/ApJS/162/227) 20 = Lawler et al. (2001ApJ...563.1075L) 21 = Lawler et al. (2001ApJS..137..341L) 22 = Lawler et al. (2004ApJ...604..850L) 23 = Lawler et al. (2008ApJS..178...71L) 24 = Lawler et al. (2007, Cat. J/ApJS/169/120) 25 = Ivarsson et al. (2003A&A...409.1141I) 26 = Grevesse (1969, Sol. Phys., 6, 381) 27 = Nilsson et al. (2002A&A...382..368N) 28 = Nilsson et al. (2002A&A...381.1090N) Note (2): References for hyperfine splitting parameters used as follows: 1 = McWilliam (1998AJ....115.1640M) 2 = Lawler et al. (2001ApJ...556..452L) 3 = Ivarsson et al. (2001, Phys. Scr, 64, 455) 4 = Lawler et al. (2001ApJ...563.1075L) 5 = Lawler et al. (2001ApJS..137..341L) 6 = Lawler et al. (2004ApJ...604..850L) 7 = Martensson-Pendrill et al. (1994, 1994, Phys. Rev. A, 49, 3351)
History: From electronic version of the journal References: Christlieb et al., Paper I 2004A&A...428.1027C Barklem et al., Paper II 2005A&A...439..129B, Cat. J/A+A/439/129 Jonsell et al., Paper III 2006A&A...451..651J Hayek et al., Paper IV 2009A&A...504..511H Mashonkina et al., Paper V 2010A&A...516A..46M, Cat. J/A+A/516/A46 Zhang et al., Paper VI 2011A&A...528A..92Z, Cat. J/A+A/528/A92 Ren et al., Paper VII 2012A&A...537A.118R Cui et al., Paper VIII 2013A&A...558A..36C Mashonkina & Christlieb, Paper IX 2014A&A...565A.123M Mashonkina et al., Paper X 2014A&A...569A..43M
(End) Patricia Vannier [CDS] 14-Nov-2017
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