J/MNRAS/369/1677 Abundance analysis of LSS 3378 (Pandey+, 2006)
Abundance analysis of the cool extreme helium star LSS 3378.
Pandey G., Reddy B.E.
<Mon. Not. R. Astron. Soc., 369, 1677-1682 (2006)>
=2006MNRAS.369.1677P 2006MNRAS.369.1677P
ADC_Keywords: Stars, variable ; Abundances, peculiar
Keywords: stars: abundances - stars: AGB and post-AGB -
stars: chemically peculiar - stars: evolution
Abstract:
Abundance analysis of the cool extreme helium (EHe) star LSS 3378 is
presented. The abundance analysis is done using local thermodynamic
equilibrium (LTE) line formation and LTE model atmospheres constructed
for EHe stars.
Description:
The spectrum of LSS 3378 was obtained on 2002 June 19 with the 4-m
Blanco telescope and the Cassegrain echelle spectrograph at Cerro
Tololo Inter-American Observatory (CTIO) in Chile. Three exposures of
25-min each, spectra covering the wavelength interval 50008200Å
without gaps, were recorded at a resolving power of R=30000. The
Image Reduction and Analysis Facility (IRAF) software packages were
used to reduce the recorded spectra.
Objects:
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RA (2000) DE Designation(s)
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15 38 59.4 -48 35 57 LSS 3378 = V* V354 Nor
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 55 136 Lines used to derive elemental abundances in LSS 3378
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Ion Ion (1)
8- 14 F7.2 0.1nm Lambda Wavelength of the line
16- 20 F5.2 eV EPlow Lower excitation potential
24- 28 F5.2 [-] loggf Oscillator strength
32- 34 I3 0.1nm EW ? Measured equivalent width
35 A1 --- n_EW [S] S: Spectrum synthesis
40- 44 F5.2 [-] logEps Individual elemental abundance (2)
48- 55 A8 --- r_loggf loggf reference (3)
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Note (1): Mean abundance values as follows:
C I = 9.53 ± 0.18
C II = 9.44 ± 0.11
N I = 8.23 ± 0.16
N II = 8.26 ± 0.20
O I = 9.29 ± 0.15
Ne I = 9.55 ± 0.30
Na I = 6.69 ± 0.26
Mg II = 5.97 ± 0.11
Al II = 5.70 ± 0.45
Al III = 6.04 ± 0.01
Si II = 6.62 ± 0.23
P II = 4.85 ± 0.12
S II = 6.52 ± 0.21
Ti II = 4.29 ± 0.15
Cr II = 4.47 ± 0.13
Mn II = 4.57 ± 0.24
Fe II = 6.11 ± 0.27
Zr II = 3.51 ± 0.13
Note (2): Normalized such that log[Sum{muieps(i)}]=12.15, where
mui is the atomic weight of element i.
Note (3): References as follows:
Jeffery = Jeffery et al. (2001MNRAS.321..111J 2001MNRAS.321..111J)
Kurucz = Kurucz's data base
Luck = Compilations by R.E. Luck
NIST = NIST data base
Thevenin = Thevenin (1989A&AS...77..137T 1989A&AS...77..137T, 1990A&AS...82..179T 1990A&AS...82..179T)
Wiese = Wiese et al. (1996, J. Phys. Chem. Ref. Data, Monograph No. 7)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Feb-2007