J/ApJ/530/783 The r-process enriched giant HD 115444 (Westin+, 2000)
The r-Process-enriched Low-Metallicity Giant HD 115444
Westin J., Sneden C., Gustafsson B., Cowan J.J.
<Astrophys. J. 530, 783 (2000)>
=2000ApJ...530..783W 2000ApJ...530..783W
ADC_Keywords: Spectroscopy ; Stars, population II
Keywords: Galaxy: halo - nuclear reactions, nucleosynthesis,
abundances - stars: abundances - stars: Population II
Abstract:
New high-resolution, very high signal-to-noise spectra of
ultrametal-poor (UMP) giant stars HD 115444 and HD 122563 have been
gathered with the High-Resolution Echelle Spectrometer of the McDonald
Observatory 2.7 m telescope. With these spectra, line identification
and model atmosphere analyses have been conducted, emphasizing the
neutron-capture elements. Twenty elements with Z > 30 have been
identified in the spectrum of HD 115444. This star is known to have
overabundances of the neutron-capture elements, but it has lacked a
detailed analysis necessary to compare with nucleosynthesis
predictions. The new study features a line-by-line differential
abundance comparison of HD 115444 with the bright, well-studied halo
giant HD 122563.
Objects:
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RA (2000) DE Designation(s)
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13 16 42.5 +36 22 53 HD 115444 = SAO 63442 = HIP 64786
14 02 31.9 +09 41 10 HD 122563 = SAO 120251 = HIP 68594
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 56 346 Equivalent widths of observed stars
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See also:
J/A+A/300/751 : Metal-poor stars spectroscopy. II (Axer+, 1995)
J/A+A/287/927 : Abundances for lines of n-capture in 19 stars (Gratton+ 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm Wave ? Wavelength of line
9- 15 A7 --- Ion Observed ion line or molecular band
17- 20 F4.2 eV ExPot ? Excitation potential of the ion
25- 30 F6.3 --- log(gf) ? Log of the oscillator strength
33- 37 F5.1 0.1nm EqW122 ? Equivalent Width of HD 122563
40- 42 A3 --- f_EqW122 Flag indicating line analyzed with
synthetic spectra
47- 51 F5.1 0.1nm EqW115 ? Equivalent Width of HD 115444
54- 56 A3 --- f_EqW115 Flag indicating line analyzed with
synthetic spectra
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History:
From ApJ electronic edition
(End) Greg Schwarz [AAS] 27-Apr-2000