J/MNRAS/359/865 Chemical composition of delta Sct (Yushchenko+, 2005)
The chemical composition of δ Scuti.
Yushchenko A., Gopka V., Kim C., Musaev F., Kang Y.W., Kovtyukh V.,
Soubiran C.
<Mon. Not. R. Astron. Soc., 359, 865-873 (2005)>
=2005MNRAS.359..865Y 2005MNRAS.359..865Y
ADC_Keywords: Stars, variable ; Abundances, peculiar ; Spectroscopy
Keywords: line: identification - stars: abundances - stars: atmospheres -
stars: evolution - stars: individual: detla Sct -
stars: individual: HD 57749
Abstract:
We present chemical abundances in the photosphere of delta Scuti
(delta Sct) - a prototype of the class of pulsating variables -
determined from the analysis of a spectrum obtained by using the 2-m
telescope at the Peak Terskol Observatory and a high-resolution
spectrometer with R=52000, a signal-to-noise ratio 250 and from
International Ultraviolet Explorer spectra. The abundance pattern of
delta Sct consists of 49 chemical elements. The abundances of 19
elements have not been investigated previously. The abundances of Pr
and Nd obtained from the lines of the second and third spectra are
equal. The abundances of heavy elements indicate the overabundances
with respect to the solar system values up to 1dex. The abundance
pattern of delta Sct is similar to the abundance patterns of Am-Fm or
delta Del type stars.
A splitting of the cores of all clean lines is observed for the
spectra of Sct and HD 57749. This can signify evidence of non-radial
pulsations in these stars
Description:
A high-resolution spectrum of Sct was obtained on 2002 May 22 using a
coude-echelle spectrometer mounted on the 2-m 'Zeiss' telescope at the
Peak Terskol Observatory located near Mt Elbrus (Northern Caucasus,
Russia), 3124m above sea level.
Objects:
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RA (2000) DE Designation(s)
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18 42 16.4 -09 03 09 delta Sct = HD 172748
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 42 158 Iron lines in the Sct 2-m telescope of Peak
Terskol Observatory spectrum of delta Sct
table4.dat 88 432 Lines of other elements in the 2-m telescope of
Peak Terskol Observatory spectrum of delta Sct
table5.dat 69 17 Lines of chemical elements in the IUE spectrum
of delta Sct
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See also:
VI/110 : Final Merged Log of IUE Observations (NASA-ESA, 2000)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 0.1nm lambda Wavelength
10- 14 A5 --- Ion Ion identification (Fe I or Fe II)
18- 23 F6.2 0.1pm EW Equivalent width
25- 29 F5.2 --- loggf Oscillator strength
31- 36 F6.3 eV Elow Excitation potential
38- 42 F5.3 --- logN Abundance of the element in the atmosphere
of delta Scuti, (log N(H)=12)
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Byte-by-byte Description of file: table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 5 F5.2 --- Z Atomic number and ionisation level (Fe I=26.00)
7- 15 F9.3 0.1nm Lambda Wavelength of the line
17- 22 F6.3 --- loggf Oscillator strength
24- 29 F6.3 eV Elow Excitation potential
31- 36 F6.3 [Sun] Abun ? Abundance of the element in the atmosphere
of delta Scuti with respect to the
corresponding solar value (table4 only)
38- 42 F5.3 --- logN Abundance of element in the atmosphere of
delta Scuti (logN(H)=12)
44- 49 F6.3 --- logNsun ? Abundance of element in the atmosphere of
the Sun (logN(H)=12) (table4 only)
51- 55 F5.3 --- blend [0/1] Level of blending of the line in the
synthetic spectra of delta Scuti (1)
57- 61 F5.3 --- blSun [0/1]? Level of blending of the line in the
synthetic spectra of the Sun (table4 only)(1)
64- 69 F6.4 --- Depth [0,1] Scuti depth in synthetic spectra
70- 74 F5.3 --- DepthS ? Sun depth in synthetic spectra (table4 only)
76- 81 F6.3 --- clogN1 ? Correction to the abundance for a surface
gravity decreased by 0.2dex (table4 only)
83- 88 F6.3 --- clogN2 ? Correction to the abundance for an effective
temperature increased by 100K (table4 only)
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Note (1): Level of blending from 0 for strongly blended line to 1 for clean line
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Feb-2006