J/A+A/516/A46 HE 2327-5642 abundance analysis (Mashonkina+, 2010)
The Hamburg/ESO R-process enhanced star survey (HERES).
V. Detailed abundance analysis of the r-process enhanced star HE 2327-5642.
Mashonkina L., Christlieb N., Barklem P.S., Hill V., Beers T.C.,
Velichko A.
<Astron. Astrophys., 516, A46-46 (2010)>
=2010A&A...516A..46M 2010A&A...516A..46M
ADC_Keywords: Stars, giant ; Spectroscopy ; Abundances ; Equivalent widths
Keywords: stars: abundances - stars: atmospheres -
stars: fundamental parameters -
nuclear reactions, nucleosynthesis, abundances
Abstract:
We present a detailed abundance analysis of a strongly r-process
enhanced giant star discovered in the HERES project, HE 2327-5642,
for which [Fe/H]=-2.78, [r/Fe]=+0.99 [r = elements from r-process].
We determined the stellar parameters and element abundances by
analyzing the high-quality VLT/UVES spectra. The surface gravity
was calculated from the non-local thermodynamic equilibrium (NLTE)
ionization balance between FeI, and FeII, and CaI and CaII.
Description:
The photometry was taken from Beers et al. 2007 (Cat. J/ApJS/168/128).
High-quality spectra of this star was acquired during May-November
2005 with the VLT and UVES in dichroic mode. The BLUE390+RED580 (4h
total integration time) and BLUE437+RED860 (10h) standard settings
were employed to ensure a wide wavelength coverage.
Objects:
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RA (2000) DE Designation(s)
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23 30 37.1 -56 26 14 HE 2327-5642 = 2MASS J23303707-5626142
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 37 44 Summary of the abundances of HE 2327-5642
table8.dat 109 290 Line data and abundances from an analysis of
HE 2327-5642
refs.dat 233 64 References
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See also:
J/ApJS/168/128 : UBVRcIc photometry of FHB and metal-poor stars (Beers+, 2007)
J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Z Atomic number
4- 8 A5 --- El Atom/molecule
12- 15 F4.2 [-] epsSun Solar photosphere abundance (ε(H)=12)
17- 18 I2 --- Nlines Number of lines used to determine abundance
21- 25 F5.2 [-] eps Abundance of the element in HE 2327-5642
26 A1 --- n_eps [N] N when NLTE abundance
28- 31 F4.2 [-] e_eps ?=- rms uncertainty on eps
33- 37 F5.2 [-] [X/Fe] ?=- Abundance relative to iron
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Z Atomic number
4- 8 A5 --- El Atom/molecule
10- 16 F7.2 0.1nm lambda Wavelength
17 A1 --- --- [-]
18- 24 F7.2 0.1nm lambda2 ? Second wavelength when interval
25- 28 F4.2 eV Eexc ?=- Excitation energy
30- 35 F6.3 [-] loggf ?=- Adopted gf-value
37- 41 A5 --- r_loggf Reference for loggf, in refs.dat file
43- 46 F4.2 [-] epsSun Solar photosphere abundance (ε(H)=12)
48- 52 F5.2 [-] epsLTE ? LTE abundance (ε(H)=12)
54- 58 F5.2 [-] epsNLTE ? NLTE abundance (1)(ε(H)=12)
60- 64 F5.2 [-] [X/Fe] ? Abundance relative to iron
66- 69 F4.1 0.1pm EW ? Equivalent width (mÅ)
70- 72 A3 --- n_EW [Syn ] from synthetic spectrum
74- 79 F6.3 [rad/s/cm3] G6/NH ? van der Waals damping constant
log(Γ6/NH) at 10000K.
81- 83 A3 --- Model1 Model used (3)
89 A1 --- --- [:]
90- 94 A5 --- r_Model1 Reference for Model1, in refs.dat file
96- 98 A3 --- Model2 Model used (3)
104 A1 --- --- [:]
105-109 A5 --- r_Model2 Reference for Model2, in refs.dat file
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Note (3): Models as follows:
G6 = Γ6
HFS = hyper-fine splitting
IS = isotopic structure
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Ref Reference code
7- 25 A19 --- BibCode BibCode
27- 55 A29 --- Aut Author's name
56-233 A178 --- Com Comments
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History:
From electronic version of the journal
References:
Christlieb et al., Paper I 2004A&A...428.1027C 2004A&A...428.1027C
Barklem et al., Paper II 2005A&A...439..129B 2005A&A...439..129B, Cat. J/A+A/439/129
Jonsell et al., Paper III 2006A&A...451..651J 2006A&A...451..651J
Hayek et al., Paper IV 2009A&A...504..511H 2009A&A...504..511H
(End) Patricia Vannier [CDS] 28-Sep-2010