J/A+A/662/A58 Reduced observations of HD112429 (Van Reeth+, 2022)
The near-core rotation of HD112429:
A gamma Doradus star with TESS photometry and legacy spectroscopy.
Van Reeth T., De Cat P., Van Beeck J., Prat V., Wright D.J., Lehmann H.,
Chene A.-N., Kambe E., Yang S.L.S., Gentile G., Joos M.
<Astron. Astrophys. 662, A58 (2022)>
=2022A&A...662A..58V 2022A&A...662A..58V (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry ; Optical ; Spectroscopy ;
Line Profiles
Keywords: asteroseismology - methods: observational -
stars: variables: general - stars: oscillations -
stars: individual: HD112429
Abstract:
The TESS space mission provides us with high-precision photometric
observations of large numbers of bright stars over more than 70% of
the entire sky, allowing us to revisit and characterise well-known
stars.
We aim to conduct an asteroseismic analysis of the gamma Doradus
(gamma Dor) star HD 112429 using both the available ground-based
spectroscopy and TESS photometry, and assess the conditions required
to measure the near-core rotation rate and buoyancy travel time.
We collect and reduce the available five sectors of short-cadence TESS
photometry of this star, as well as 672 legacy observations from six
medium- to high-resolution ground-based spectrographs. We determine
the stellar pulsation frequencies from both data sets using iterative
prewhitening, do asymptotic g mode modelling of the star and
investigate the corresponding spectral line profile variations using
the pixel-by-pixel method.
We validate the pulsation frequencies from the TESS data up to
S/N≥5.6, confirming recent reports in the literature that the
classical criterion S/N≥4 does not suffice for space-based
observations. We identify the pulsations as prograde dipole g modes
and r-mode pulsations, and measure a near-core rotation rate of
1.536(3)d-1 and a buoyancy travel time Π0 of 4190(50) s. These
results are in agreement with the observed spectral line profile
variations, which were qualitatively evaluated using a newly developed
toy model. We establish a set of conditions that have to be fulfilled
for an asymptotic asteroseismic analysis of g-mode pulsators. In the
case of HD112429, two TESS sectors of space photometry suffice.
Although a detailed asteroseismic modelling analysis is not viable for
g-mode pulsators with only short or sparse light curves of space
photometry, it is possible to determine global asteroseismic
quantities for a subset of these stars. Thanks to the ongoing TESS
mission, this will allow us to characterise many more stars than only
those with years of data.
Description:
Fully reduced observations of the gamma Doradus variable HD112429. In
the first table, an overview is given of the 672 collected (De Cat et
al., 2009AIPC.1170..480D 2009AIPC.1170..480D) and normalised high-resolution spectra, with
observation details including the used instruments, the time stamps of
the observation (in BJD), the barycentric velocity corrections, and
the S/N values of the reduced spectra. In the second table, a list of
the five TESS sectors with normalised photometry is provided.
Objects:
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RA (2000) DE Designation(s)
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12 55 28.55 +65 26 18.5 HD 112429 = TIC 142319244
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
listphot.dat 35 5 List of reduced and detrended short-cadence TESS
photometry of HD112429
phot/* . 5 Individual reduced and detrended short-cadence
TESS photometry of HD112429 files
listsp.dat 88 672 List of reduced and normalised spectra of
HD112429 (with relevant observation information)
sp/* . 672 Individual reduced and normalised spectra of
HD112429
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Byte-by-byte Description of file: listphot.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Sector TESS sector during which the photometry
was taken
4- 35 A32 --- FileName Filename of the associated observed and
detrended TESS photometry in subdirectory phot
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Byte-by-byte Description of file: listsp.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Inst Name of the used spectrograph
10- 26 F17.9 d BJD Barycentric Julian Day of the observation
28- 45 F18.14 km/s BVCor Barycentric RV correction
47- 49 I3 --- SNR Signal-to-noise ratio of the spectrum
51- 88 A38 --- FileName Filename of the associated observed and
reduced spectrum in subdirectory sp
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Acknowledgements:
Timothy Van Reeth, timothy.vanreeth(at)kuleuven.be
(End) Timothy Van Reeth [IvS, KU Leuven], Patricia Vannier CDS 08-Apr-2022