J/A+A/618/A109 Seismic global parameters of 372 KIC (Mosser+, 2018)
Period spacings in red giants.
IV. Toward a complete description of the mixed-mode pattern.
Mosser B., Gehan C., Belkacem K., Samadi R., Michel E., Goupil M-J.
<Astron. Astrophys. 618, A109 (2018)>
=2018A&A...618A.109M 2018A&A...618A.109M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Spectroscopy
Keywords: stars: evolution - stars: interiors - stars: oscillations
Abstract:
Oscillation modes with a mixed character, as observed in evolved
low-mass stars, are highly sensitive to the physical properties of the
innermost regions. Measuring their properties is therefore extremely
important to probe the core, but requires some care, due to the
complexity of the mixed-mode pattern. The aim of this work is to
provide a consistent description of the mixed-mode pattern of low-mass
stars, based on the asymptotic expansion. We also study the variation
of the gravity offset epsilong with stellar evolution. We revisit
previous works about mixed modes in red giants and empirically test
how period spacings, rotational splittings, mixed-mode widths, and
heights can be estimated in a consistent view, based on the properties
of the mode inertia ratios. From the asymptotic fit of the mixed-mode
pattern of a large set of red giants at various evolutionary stages,
we derive unbiased and precise asymptotic parameters. As the
asymptotic expansion of gravity modes is verified with a precision
close to the frequency resolution for stars on the red giant branch
(10-4 in relative values), we can derive accurate values of the
asymptotic parameters. We decipher the complex pattern in a rapidly
rotating star, and explain how asymmetrical splittings can be
inferred. We also revisit the stellar inclinations in two open
clusters, NGC 6819 and NGC 6791: our results show that the stellar
inclinations in these clusters do not have privileged orientation in
the sky. The variation of the asymptotic gravity offset with stellar
evolution is investigated in detail. We also derive generic properties
that explain under which conditions mixed modes can be observed.
Description:
Seismic global parameters of the stars listed in the paper. Each star
is identified with its KIC number (Kepler Input Catalog).
Asymptotic gravity offset. Estimates of the period spacings and
evolutionary stages are from Vrard et al. (2016, Cat. J/A+A/588/A87);
estimates of the coupling factors are from Mosser et al. (2017, Cat.
J/A+A/600/A1).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 372 Seismic global parameters of the stars listed
in the paper
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See also:
J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016)
J/A+A/600/A1 : Coupling factors of 5166 KIC (Mosser+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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2- 9 I8 --- KIC KIC number
12- 17 F6.2 muHz numax Frequecy of maximum oscillation power
19- 23 F5.2 muHz e_numax Uncertainty in numax
26- 30 F5.2 muHz Dnu Large separation
32- 35 F4.2 muHz e_Dnu Uncertainty in Dnu
38- 43 F6.2 s DPi1 Period spacing
45- 48 F4.2 s e_DPi1 Uncertainty in DPi1
51- 54 F4.2 --- q Coupling factor
56- 59 F4.2 --- e_q Uncertainty in q
62- 67 F6.3 --- eps Gravity mode offset
69- 73 F5.3 --- e_eps Uncertainty in eps
77- 79 I3 --- dnurot ?=999 Rotational splitting
81- 83 I3 --- e_dnurot ?=999 Uncertainty in dnurot
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Acknowledgements:
Benoit Mosser, benoit.mosser(at)obspm.fr
References:
Mosser et al., Paper I 2015A&A...584A..50M 2015A&A...584A..50M
Vrard et al., Paper II 2016A&A...588A..87V 2016A&A...588A..87V, Cat. J/A+A/588/A87
Mosser et al., Paper III 2017A&A...600A...1M 2017A&A...600A...1M, Cat. J/A+A/600/1
(End) Patricia Vannier [CDS] 27-Jul-2018