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 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 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:
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RA (2000) DE Designation(s)
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11 49 03.3 +16 58 41 NAME HKII 17435-00532 = BPS CS 17435-0532
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 35 141 Equivalent width measurements
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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
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Bytes Format Units Label Explanations
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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
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History:
From electronic version of the journal
References:
Hollek et al. Paper II. 2011ApJ...742...54H 2011ApJ...742...54H Cat. J/ApJ/742/54
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Oct-2010