J/A+A/686/A174 delta Scuti stars in TESS cycle-4 (Lv+, 2024)
Statistical analysis of asteroseismic indices and stellar parameters of
TESS-observed delta scuti stars.
Lv C., Esamdin A, Hasanzadeh A., Ghazinejad M., Pascual-Granado J.,
Mirouh G.M., Karimov R.
<Astron. Astrophys. 686, A174 (2024)>
=2024A&A...686A.174L 2024A&A...686A.174L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Asteroseismology ; Optical
Keywords: asteroseismology - stars: oscillations - stars: statistics -
stars: variables: delta Scuti
Abstract:
Over the last few years, delta Scuti stars have been at the center of
the attention of the asteroseismology community thanks to the
derivation of seismic indices connected to stellar parameters. The
statistical analysis of the wealth of data offered by a large space
survey such as the Transiting Exoplanet Survey Satellite (TESS), the
identification of new delta Scuti stars, and the correlation between
asteroseismic indices and stellar parameters in the resulting sample
are therefore of utmost interest.
The goal of our study is to analyze the statistical properties of
stellar parameters and characterize the asteroseismic indices of delta
Scuti stars observed in TESS cycle 4.
We discovered 765 delta stars from the data obtained by the TESS
mission, from Sectors 40 to 55, corresponding to cycle 4 and observed
with a 2 min cadence. Of these stars, 179 delta stars have
low-resolution spectral parameters from LAMOST. We first analyzed the
relation between pulsation and stellar parameters from TESS
observations and the distribution of delta stars with two different
stellar parameters, TESS Input Catalog (TIC) and Large Sky Area
Multi-Object Fiber Spectroscopic Telescope (LAMOST), within the
classical instability strip. Most of the stars lie within the
instability strip and follow the period-luminosity relation of delta
stars. Additionally, the majority of the stars exhibit pulsation
properties consistent with those expected for delta stars, including
periods falling within the typical range, amplitudes at the
millimagnitude level, and fundamental parameters such as spectral
type, effective temperature, log g, and luminosity that match the
characteristics of delta stars. This confirms the reliability of the
delta stars we have identified. We subsequently obtained the large
frequency separation {DELTA}ν, νmax, and νAmax for 179
delta stars with LAMOST parameters by using an empirical relation and
a 2D autocorrelation method, and obtained the relations between these
asteroseismic indices. These stars will provide significant support
for a deeper study of the internal structure and evolution of stars.
Description:
The TESS data analysed in this work are the 2-min light curves
provided by the TESS Science Team, which are publicly available from
the Mikulski Archive for Space Telescopes (MAST)
(https://archive.stsci.edu). The table shows the parameter information
of the certified delta scuti stars of this work.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 143 765 Stellar parameters for the 765 delta Scuti stars
tablea2.dat 71 179 Catalogs of 179 delta Scuti stars with LAMOST
parameters (Cui et al., 2012RAA....12.1197C 2012RAA....12.1197C)
and asteroseismic indices
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 10 I10 --- TIC TESS Input Catalog (TIC) number
12- 21 F10.6 deg RAdeg Right ascension (J2000)
23- 35 F13.9 deg DEdeg Declination (J2000)
37- 41 F5.2 mag Vmag V band magnitude
43- 46 I4 K Teff Effective temperature
48- 50 I3 K e_Teff ? Error in Effective temperature
52- 55 F4.2 Msun Mass ? Stellar mass
57- 60 F4.2 Msun e_Mass ? Error in stellar mass
62- 66 F5.2 Rsun R ? Stellar radius
68- 71 F4.2 Rsun e_R ? Error in Stellar radius
73- 76 F4.2 [cm/s2] logg ? Gravitational acceleration
78- 81 F4.2 [cm/s2] e_logg ? Error in logg
83- 87 F5.2 --- Lum ? Luminosity
89- 93 F5.2 --- e_Lum ? Error in luminosity
95- 99 F5.2 mas plx Parallax
101-104 F4.2 mas e_plx Error in parallax
106-110 F5.2 mag VMAG Absolute V magnitude
112-118 F7.4 c/d Freq Frequency at maximum power
120-125 F6.4 c/d e_Freq Error in Frequency at maximum power
127-132 F6.2 mmag Amp Amplitude
134-137 F4.2 mmag e_Amp Error in Amplitude
139-143 F5.3 --- Q ? Pulsation constant
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- TIC TESS Input Catalog (TIC) number
11- 12 A2 --- SpType Spectral type
14- 17 I4 K Teff Effective temperature
19- 21 I3 K e_Teff Effective temperature error
23- 27 F5.2 [-] [Fe/H] Metallicity
29- 32 F4.2 [-] e_[Fe/H] Metallicity error
34- 37 F4.2 [cm/s2] logg Surface gravity
39- 42 F4.2 [cm/s2] e_logg Surface gravity error
44- 48 F5.3 --- Q ? Pulsation constant
50- 54 F5.2 d-1 nuf ? Pulsation frequency
56- 60 F5.2 d-1 nuAmax ? Frequency associated with the highest
amplitude in the power spectrum
62- 66 F5.2 d-1 numax ? Frequency at maximum power
68- 71 F4.2 d-1 Dnu ? Large frequency separation
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Acknowledgements:
Chenglong Lv, lvchenglong(at)xao.ac.cn
History:
11-Jun-2024: on-line version of table A1 from author
18-Jul-2024: table A2 added from electronic version
(End) Chenglong Lv [XAO], Patricia Vannier [CDS] 29-Mar-2024