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J/A+A/503/945   HD 145788, 21 Peg and pi Cet chemical analysis  (Fossati+, 2009)

The chemical abundance analysis of normal early A- and late B-type stars. Fossati L., Ryabchikova T., Bagnulo S., Alecian E., Grunhut J., Kochukhov O., Wade G. <Astron. Astrophys. 503, 945 (2009)> =2009A&A...503..945F
ADC_Keywords: Stars, early-type ; Spectroscopy ; Atomic physics Keywords: stars: abundances - stars: individual: HD145788, 21 Peg, pi Cet Abstract: Modern spectroscopy of early-type stars often aims at studying complex physical phenomena such as stellar pulsation, the peculiarity of the composition of the photosphere, chemical stratification, the presence of a magnetic field, and its interplay with the stellar atmosphere and the circumstellar environment. Comparatively less attention is paid to identifying and studying the "normal" A- and B-type stars and testing how the basic atomic parameters and standard spectral analysis allow one to fit the observations. By contrast, this kind of study is paramount for eventually allowing one to correctly quantify the impact of the various physical processes that occur inside the atmospheres of A- and B-type stars. We wish to establish whether the chemical composition of the solar photosphere can be regarded as a reference for early A- and late B-type stars. Description: Adopted atomic line parameters and measured equivalent widths for a high precision abundance analysis of three chemically normal early-type stars are presented. The three stars are: HD 145788, 21 Peg and π Cet. For each line excitation potential, oscillator strength (with error bar), line abundance, measured line equivalent width and reference for the oscillator strength value are given. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 16 12 56.6 -04 13 15 Star 1 = HD 145788 = HIP 79463 22 03 19.0 +11 23 12 Star 2 = 21 Peg = HD 209459 02 44 07.3 -13 51 31 Star 3 = pi Cet = HD 17081 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table9.dat 92 1086 Linelist of the lines used for the abundance analysis of HD 145788, 21 Peg and π Cet refs.dat 165 47 References
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Ion Element/Ion 9- 17 F9.4 0.1nm lambda Wavelength 19- 24 F6.3 eV EP Excitation potential 26- 31 F6.3 --- log(gf) log(gf) value 33- 36 F4.3 --- e_log(gf) ? Error on the log(gf) value 38- 42 F5.1 0.1pm EW1 ? HD 145788 Line equivalent width 44- 48 F5.2 --- Abund1 ? HD 145788 Line abundance 49 A1 --- u_Abund1 Uncertainty flag on Abund1 51- 56 F6.2 0.1pm EW2 ? 21 Peg line equivalent width 58- 63 F6.2 --- Abund2 ? 21 Peg line abundance 64 A1 --- u_Abund2 Uncertainty flag on Abund1 65- 69 F5.1 0.1pm EW3 ? π Cet line equivalent width 71- 75 F5.2 --- Abund3 ? π Cet line abundance 76 A1 --- u_Abund3 Uncertainty flag on Abund3 78- 84 A7 --- r_log(gf) Reference for the log(gf) value 86- 87 A2 --- N1 [S: ] Note for HD 145788 (1) 89 A1 --- N2 [S] Note for 21 Peg (1) 91- 92 A2 --- N3 [S: ] Note for pi Cet (1)
Note (1): Note as follows: S = line abundance measured with spectral synthesis : = line abundance uncertain
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Ref Reference code 8- 26 A19 --- BibCode BibCode 28- 49 A22 --- Aut Author's name 55-165 A111 --- Com Comments
Acknowledgements: Luca Fossati, fossati1511(at)googlemail.com
(End) Luca Fossati [University of Vienna], Patricia Vannier [CDS] 08-Jun-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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