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: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- See also: IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019) Byte-by-byte Description of file: tablea1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- 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
The document above follows the rules of the Standard Description for Astronomical Catalogues; from this documentation it is possible to generate f77 program to load files into arrays or line by line