J/A+A/681/L20 Seismic global parameters of 1507 red giants (Mosser+, 2024)
Locked differential rotation in core-helium burning red giants.
Mosser B., Dreau G., Pincon C., Deheuvels S., Belkacem K., Lebreton Y.,
Goupil M-J., Michel E.
<Astron. Astrophys. 681, L20 (2024)>
=2024A&A...681L..20M 2024A&A...681L..20M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Asteroseismology ; Spectroscopy
Keywords: asteroseismology - stars: evolution - stars: horizontal-branch
Abstract:
Oscillation modes of a mixed character are able to probe the inner
region of evolved low-mass stars and offer access to a range of
information, in particular, the mean core rotation. Ensemble
asteroseismology observations are then able to provide clear views on
the transfer of angular momentum when stars evolve as red giants.
Previous catalogs of core rotation rates in evolved low-mass stars
have focussed on hydrogen-shell burning stars. Our aim is to complete
the compilation of rotation measurements toward more evolved stages,
with a detailed analysis of the mean core rotation in core-helium
burning giants.
The asymptotic expansion for dipole mixed modes allows us to fit
oscillation spectra of red clump stars and derive their core rotation
rates. We used a range of prior seismic analyses, complete with new
data, to get statistically significant results.
We measured the mean core rotation rates for more than 1500 red clump
stars. We find that the evolution of the core rotation rate in
core-helium-burning stars scales with the inverse square of the
stellar radius, with a small dependence on mass.
Assuming the conservation of the global angular momentum, a simple
model allows us to infer that the mean core rotation and envelope
rotation are necessarily coupled. The coupling mechanism ensures that
the differential rotation in core-helium-burning red giants is locked.
Description:
Seismic global parameters of the red-clump stars analyzed in the
paper, including rotational splittings. Each star is identified with
its KIC number (Kepler Input Catalog).
Estimates of the large separation and frequency of maximum oscillation
signal are derived from Mosser & Appourchaux (2009A&A...508..877M 2009A&A...508..877M).
Estimates of the period spacings and evolutionary stages are from
Mosser et al. (2018A&A...618A.109M 2018A&A...618A.109M, Cat. J/A+A/618/A109); estimates of
the coupling factors are from Mosser et al. (2017A&A...600A...1M 2017A&A...600A...1M, 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 64 1507 Seismic global parameters
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
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)
J/A+A/618/A109 : Seismic global parameters of 372 KIC (Mosser+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- KIC KIC number
10- 17 F8.2 muHz numax Frequecy of maximum oscillation power
18- 22 F5.2 muHz e_numax Uncertainty in numax
23- 29 F7.2 muHz Dnu Large separation
30- 34 F5.2 muHz e_Dnu Uncertainty in Dnu
35- 41 F7.1 s DPi1 Period spacing
42- 45 F4.1 s e_DPi1 Uncertainty in DPi1
46- 51 F6.2 --- q Coupling factor
52- 56 F5.2 --- e_q Uncertainty in q
57- 61 I5 --- dnurot Rotational splitting
62- 64 I3 --- e_dnurot Uncertainty in dnurot
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Acknowledgements:
Benoit Mosser, benoit.mosser(at)observatoiredeparis.psl.eu
(End) Patricia Vannier [CDS] 17-Jan-2024