J/A+A/705/A251 5 oscillating eclipsing Algols puls. frequencies (Pawar+, 2026)
A comprehensive study of delta Scuti-type pulsators in eclipsing binaries:
Oscillating eclipsing Algols.
Pawar T., Miszuda A., Helminiak K.G., Marcadon F., Moharana A., Pawar G.,
Konacki M.
<Astron. Astrophys. 705, A251 (2026)>
=2026A&A...705A.251P 2026A&A...705A.251P (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Asteroseismology ; Optical
Keywords: binaries: eclipsing - stars: oscillations - variables: delta Scuti -
Abstract:
Eclipsing double-lined spectroscopic binaries (SB2s) hosting delta
Scuti-type pulsators offer a unique laboratory for simultaneously
constraining stellar geometry and interior structure. In this study,
we present a comprehensive analysis of five oscillating eclipsing
Algol (oEA) binaries. By combining high-precision, short-cadence TESS
photometry with multi-epoch high-resolution spectroscopy, we derive
precise stellar and orbital parameters. Frequency power spectra were
obtained using residuals from binary modelling. We further investigate
the evolutionary history of these systems using a grid of MESA binary
evolution simulations. Our analysis suggests that the systems must
have undergone either case A or case B mass transfer, with the primary
components repositioned in the Hertzsprung-Russell diagram and now
pulsating in the delta Scuti regime, while the cooler secondaries are
underluminous and inflated, filling their Roche lobes. This study
contributes to the growing catalog of well-characterised oEA systems
and our understanding of the effects of mass-transfer on the fate of
these short-period binaries.
Description:
Minima were measured by fitting eclipses in the detrended TESS light
curves using a Kwee-van Woerden/parabola fit.
Frequencies were obtained via least-squares multi-sinusoid fitting
(LSF) on the out-of-eclipse light curve; uncertainties are formal
1-sigma errors from the fit.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 119 5 Basic information about the targets
tablea1.dat 27 47 Eclipse minima times for TIC64437380
tableb1.dat 69 21 Pulsation frequencies for TIC 64437380
tablea2.dat 27 73 Eclipse minima times for TIC82474821
tableb2.dat 69 16 Pulsation frequencies for TIC 82474821
tablea3.dat 27 138 Eclipse minima times for TIC126945917
tableb3.dat 74 42 Pulsation frequencies for TIC 126945917
tablea4.dat 27 42 Eclipse minima times for TIC10756751
tableb4.dat 70 14 Pulsation frequencies for TIC 10756751
tablea5.dat 27 41 Eclipse minima times for TIC37817410
tableb5.dat 71 24 Pulsation frequencies for TIC 37817410
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 A13 --- Name Star Name (TIC NNNNNNNNN)
15- 23 A9 --- OName Other name
25- 38 A14 --- Sectors TESS sectors with 2-min Photometry
40- 49 F10.6 deg RAdeg Right ascension (J2000)
51- 61 F11.7 deg DEdeg Declination (J2000)
63- 67 F5.2 mag Vmag V magnitude
69- 75 F7.3 pc Dist Gaia DR3 distance
77- 87 A11 --- Spectro Spectrograph(s) (1)
89- 95 A7 --- Nsp Number of spectra, by instruments
97-107 A11 --- Ecl Name of the table with eclipse minima times
109-119 A11 --- Puls Name of the table with pulsation frequencies
--------------------------------------------------------------------------------
Note (1): Spectrographs code as:
1C = SMARTS 1.5-m/CHIRON
2F = MPG-2.2m/FEROS
OH = OAO-188/HIDES
SI = Subaru/IRCS
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea?.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.6 d BJD Barycentric Julian date (BJD-2457000)
13- 18 F6.1 --- Cycle Eclipse cycle number
(primary = integer; secondary = half-integer)
20- 27 F8.6 d e_BJD 1-sigma uncertainty in BJD
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb?.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- Label Frequency label (F1, F2, ...)
5- 14 F10.7 d-1 Freq Frequency in cycles per day
16- 23 E8.3 d-1 e_Freq 1-sigma uncertainty on frequency
25- 32 F8.6 --- Amp Amplitude (same units as light curve,
i.e. relative flux)
34- 41 E8.3 --- e_Amp 1-sigma uncertainty on amplitude
43- 50 F8.6 --- Phase [0/1] Phase (in cycles)
52- 59 E8.3 --- e_Phase 1-sigma uncertainty on phase (cycles)
60- 74 A15 --- Com Short comment or frequency combination notation
--------------------------------------------------------------------------------
Acknowledgements:
Tilak Pawar, pawar(at)ncac.torun.pl
(End) Patricia Vannier [CDS] 14-Nov-2025