J/A+A/328/261 Spectroscopy of Alpha Cen (Neuforge-Verheecke+ 1997)
Spectroscopic analysis of the Alpha Centauri System
Neuforge-Verheecke C., Magain P.
<Astron. Astrophys. 328, 261 (1997)>
=1997A&A...328..261N 1997A&A...328..261N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Abundances ; Spectroscopy
Keywords: stars: α Centauri -
stars: binaries: visual; abundances; fundamental parameters -
Description:
This table presents the results of a spectroscopic analysis
(differentially to the Sun) of the two components of the
binary system Alpha Centauri. This analysis has been carried out on
the basis of extensive high resolution and high signal-to-noise
spectra taken at the European Southern Observatory (La Silla, Chile).
Objects:
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RA (2000) DE Designation(s)
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14 40 00.8 -60 50 42 alpha Cen A = HR 5459 = HD 128620
14 40 00.7 -60 50 38 alpha Cen B = HR 5460 = HD 128621
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4 107 161 Spectroscopic data and abundances in Alpha Cen A,
Alpha Cen B and the Sun.
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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1- 4 A4 --- Elm Element and ionisation stage
6- 10 F5.3 --- AbundSun Solar abundance (1) (2)
13- 20 F8.3 0.1nm lambda Wavelength of the line
23- 28 F6.3 eV EP Excitation potential of the lower level
32- 37 F6.3 --- log(gf) Solar oscillator strength in log10
41- 44 F4.1 0.1pm EWsc Solar equivalent width at the disk center
48- 51 F4.1 0.1pm EWs ? Solar equivalent width in integrated light
55- 59 F5.3 --- AbundSun2 ? Solar abundance from EW in integrated light
62- 66 F5.1 0.1pm EWa ? Equivalent width in Alpha Cen A
70- 74 F5.3 --- AbundA ? Abundance in Alpha Cen A (1)
77- 81 F5.1 0.1pm EWb ? Equivalent width in Alpha Cen B
85- 89 F5.3 --- AbundB ? Abundance in Alpha Cen B (1)
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Note (1): The abundance of an element is given on the usual logarithmic
scale relative to hydrogen: A(el)=(log(Nel/NH) + 12)
Nel and NH being respectively the number densities of the element
and of hydrogen.
Note (2): For the CN molecule, the solar abundance indicated is that of N.
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Acknowledgements: Corinne Neuforge
(End) Patricia Bauer [CDS] 25-Aug-1997