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 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:
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RA (2000) DE Designation(s)
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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
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File Summary:
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FileName Lrecl Records Explanations
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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
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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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 π Cet (1)
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Note (1): Note as follows:
S = line abundance measured with spectral synthesis
: = line abundance uncertain
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Ref Reference code
8- 26 A19 --- BibCode BibCode
28- 49 A22 --- Aut Author's name
55-165 A111 --- Com Comments
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Acknowledgements:
Luca Fossati, fossati1511(at)googlemail.com
(End) Luca Fossati [University of Vienna], Patricia Vannier [CDS] 08-Jun-2009