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J/ApJ/679/1549  Spectroscopy of metal-poor star CS 17435-00532 (Roederer+, 2008)

The Hobby-Eberly telescope Chemical Abundances of Stars in the Halo (CASH) project. I. The lithium-, s-, and r-enhanced metal-poor giant HKII 17435-00532. Roederer I.U., Frebel A., Shetrone M.D., Allende Prieto C., Rhee J., Gallino R., Bisterzo S., Sneden C., Beers T.C., Cowan J.J. <Astrophys. J., 679, 1549-1565 (2008)> =2008ApJ...679.1549R
ADC_Keywords: Equivalent widths ; Stars, metal-deficient ; Stars, giant Keywords: nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: individual (HKII 17435-00532) - stars: Population II Abstract: We present the first detailed abundance analysis of the metal-poor giant HKII 17435-00532. This star was observed as part of the University of Texas long-term project Chemical Abundances of Stars in the Halo (CASH). A spectrum was obtained with the High Resolution Spectrograph (HRS) on the Hobby-Eberly Telescope with a resolving power of R∼15000. Our analysis reveals that this star may be located on the red giant branch, red horizontal branch, or early asymptotic giant branch. We find that this metal-poor ([Fe/H]=-2.2) star has an unusually high lithium abundance [logε(Li)=+2.1], mild carbon ([C/Fe]=+0.7) and sodium ([Na/Fe]=+0.6) enhancement, as well as enhancement of both s-process ([Ba/Fe]=+0.8) and r-process ([Eu/Fe]=+0.5) material. Description: The HK-II survey (Rhee, 2001PASP..113.1569R) originated as an extension of the original HK objective-prism survey of Beers et al. (1985, Cat. J/AJ/90/2089; 1992, Cat. J/AJ/103/1987). The star HKII 17435-00532 was observed on 2007 February 9 and 28 with the High Resolution Spectrograph at the HET at McDonald Observatory. The spectral coverage is 4120-7850Å, with a small break from 5930 to 6030Å resulting from the gap between the blue and red CCDs of the HRS. One 10 minute exposure was taken on each night. Objects: -------------------------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------------------------- 11 49 03.3 +16 58 41 NAME HKII 17435-00532 = BPS CS 17435-0532 -------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 35 141 Equivalent width measurements
See also: J/A+A/509/A93 : Carbon-enhanced metal-poor stars (Masseron+, 2010) J/AJ/108/268 : HK survey emission-line candidates positions (Beers+ 1994) J/AJ/108/538 : Metal-poor MS stars UBV photometry (Preston+ 1994) J/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992) J/PASP/103/973 : Photoelectric UBV from HK survey. II. (Doidinis+ 1991) J/AJ/90/2089 : Stars of very low metal abundance. I (Beers+, 1985) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ion Species identification 7- 8 I2 --- Z Atomic number 10- 16 F7.2 0.1nm Wave Wavelength 18- 22 F5.3 eV ExPot Excitation potential 24- 29 F6.3 [-] loggf Log of the oscillator strength 31- 35 F5.1 10-13m EW Equivalent width in milliAngstroms
History: From electronic version of the journal References: Hollek et al. Paper II. 2011ApJ...742...54H Cat. J/ApJ/742/54
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Oct-2010
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