J/AZh/84/429 Abundances in atmospheres of cool giants (Mishenina+, 2007)
Abundances of neutron-capture elements in atmospheres of cool giants.
Mishenina T.V., Gorbaneva T.I., Bienayme O., Soubiran C., Kovtyukh V.V.,
Orlova L.F.
<Astron. Zh. 84, 429 (2007)>
=2007AZh....84..429M 2007AZh....84..429M
=2007ARep...51..382M 2007ARep...51..382M
ADC_Keywords: Stars, giant ; Abundances
Abstract:
We have determined the atmospheric abundances of Y, Ba, La, Ce, Pr,
Nd, and Eu for a sample of 171 giants selected as clump giants with
metallicities [Fe/H] between 0.7 and 0.3dex, based on photometric
criteria. In our analysis, we assumed local thermodynamic equilibrium
and fit the parameters of model atmospheres to high-resolution
(R=42000) echelle spectra with high signal-to-noise ratios. The Ba
and Eu abundances were derived using synthetic spectra, including
hyperfine structure. We find no significant difference in the
abundances of s-or r-process neutron-capture elements between clump
giants and ascending-branch giants selected by us earlier. We also
analyze the relation between the abundances of neutron-capture
elements and [Fe/H].
Description:
Spectra of the program stars were acquiered with the 1.93m telescope
of the Haute-Provence Observatory (France) equipped with the ELODIE
echelle spectrometer. The spectrometer's resolution was R=42000, the
wavelength interval studied 4400Å-6800Å, and the signal-to-noise
ratios of the order of 100-350.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 171 HD numbers, Teff, logg, evolutionary stages (ES),
[Fe/H], and [A/Fe]
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See also:
J/AZh/77/96 : Abundances in Hyades red giants (Boyarchuk+, 2000)
J/AZh/81/658 : Equivalent widths of 9 barium stars (Antipova+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number
8- 11 I4 K Teff Effective temperature
13- 16 F4.2 [cm/s2] logg Surface gravity
18- 20 A3 --- ES Evolutionnary stage, as CL = clump giant or
RGB = ascending-giant branch
22- 26 F5.2 [Sun] [Fe/H] Metallicity
28- 32 F5.2 [Sun] [Y/Fe] ?=- Y (Z=39) abundance, relative to Fe
34- 38 F5.2 [Sun] [Ba/Fe] ?=- Ba (Z=56) abundance, relative to Fe
40- 44 F5.2 [Sun] [La/Fe] ?=- La (Z=57) abundance, relative to Fe
46- 50 F5.2 [Sun] [Ce/Fe] ?=- Ce (Z=58) abundance, relative to Fe
52- 56 F5.2 [Sun] [Pr/Fe] ?=- Pr (Z=59) abundance, relative to Fe
58- 62 F5.2 [Sun] [Nd/Fe] ?=- Nd (Z=60) abundance, relative to Fe
64- 68 F5.2 [Sun] [Eu/Fe] ?=- Eu (Z=63) abundance, relative to Fe
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History:
From electronic version of the journal
(End) Veta Avedisova [INASAN], Patricia Vannier [CDS] 08-Jan-2008