J/AJ/164/216 Photometric and spectroscopic study of Algol EW Bootis (Kim+, 2022)
A Photometric and Spectroscopic Study of the Short-period Algol EW Bootis with
a δ Sct Pulsator
Kim H.-Y., Hong K., Kim C.-H., Lee J.W., Jeong M.-J., Park J.-H., Song M.-H.
<Astron. J., 164, 216 (2022)>
=2022AJ....164..216K 2022AJ....164..216K
ADC_Keywords: Binaries, eclipsing; Stars, variable; Photometry;
Spectra, optical; Spectra, infrared; Radial velocities
Keywords: Eclipsing binary stars ; Algol variable stars ; Pulsating
variable stars
Abstract:
In this paper, we present Transiting Exoplanet Survey Satellite (TESS)
photometry and high-resolution spectra of the short-period
Algol-EW-Boo. We obtained double-lined radial velocities (RVs) from
the time-series spectra and measured the effective temperature of the
primary star as Teff,1=8560±118K. For the orbital period study, we
collected all times of minima available for over the last 30yr. It was
found that the eclipse timing variation of the system could be
represented by a periodic oscillation of 17.6±0.3yr with a
semiamplitude of 0.0041±0.0001day. The orbital and physical
parameters were derived by simultaneously analyzing the TESS light and
RV curves using the Wilson-Devinney (WD) binary star modeling code.
The component masses and radii were showed over 3% precision:
M1=2.67±0.08M☉, M2=0.43±0.01M☉,
R1=2.01±0.02R☉, and R2=1.35±0.01R☉. Furthermore,
multiple frequency analyses were performed for the light-curve
residuals from the WD model. As a result, we detected 17 pressure-mode
pulsations in the region of 40.15-52.37/day. The absolute dimensions
and pulsation characteristics showed that the δSct pulsator was
the more massive and hotter primary star of the EW Boo.
Description:
High-precision photometric observations of EW Boo were obtained by the
Transiting Exoplanet Survey Satellite (TESS) mission in a 2min cadence
mode during Sectors 23 and 24. The data was then observed from 2020
March 18 to April 16 and 2020 April 16 to May 13 using cameras 2 and
1, respectively. We used simple aperture photometry (SAP) flux data
obtained from the Mikulski Archive for Space Telescopes (MAST) Portal.
We observed a total of 39 high-resolution spectra from the Bohyunsan
Observatory Echelle Spectrograph (BOES) at Bohyunsan Optical Astronomy
Observatory in Korea. The observations were made during 8 nights from
2018 January 20 to 2020 January 4 using 1.8m telescope with a fiber
having a diameter of 300µm (R∼30000). The BOES covers a wavelength
range of 3600-10200Å. The exposure time was set at 1500s. The mean
signal-to-noise ratio of the observed spectra was approximately 42 at
5000Å.
Objects:
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RA (2000) DE Designation(s)
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15 02 46.09 +37 54 36.4 Algol EW Bootis = V* EW Boo
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 39 Radial velocities of EW Boo
table5.dat 74 19 The independent multiple frequencies of EW Boo
tablea1.dat 47 183 All times of minimum light for EW Boo
tableb1.dat 60 127 Results of multiple frequency analysis of EW Boo
refs.dat 101 25 References used for tablea1
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
VI/120 : High-resolution synthetic stellar library (Coelho+, 2005)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/A+AS/141/371 : Low-mass stars evolut. tracks & isochrones (Girardi+, 2000)
J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)
J/AJ/129/2798 : AR Mon photometry and radial velocities (Williamon+, 2005)
J/other/IBVS/5731 : Minima and maxima of 816 variables (Hubscher+, 2006)
J/MNRAS/370/2013 : Catalogue of close binaries (Soydugan+, 2006)
J/other/IBVS/5802 : Minima and maxima of 735 variables (Hubscher+, 2007)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/PASP/124/411 : YY Cet UBV differential light curves (Williamon+, 2012)
J/ApJS/208/9 : Intrinsic colors & temperatures PMS stars (Pecaut+, 2013)
J/A+A/566/A98 : The Gaia Benchmark Stars - Library (Blanco-Cuaresma+, 2014)
J/A+A/564/A133 : Gaia FGK benchmark stars; metallicity (Jofre+, 2014)
J/AJ/148/37 : Long-term photometric behavior of V404 Lyr (Lee+, 2014)
J/AJ/159/24 : Spectroscopy & Kepler data of EB star V404 Lyr (Lee+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 d BJD [139/854] Barycentric Julian Date; BJD-2458000
10- 14 F5.3 --- Phase [0.01/1] Phase
16- 20 F5.1 km/s RVel1G [-40.4/51] Radial velocity 1 (Gaussian Fitting)
22- 25 F4.1 km/s e_RVel1G [1/13] Error on RVel1-G
27- 32 F6.1 km/s RVel2G [-249/253]? Radial velocity 2 (Gaussian Fitting)
34- 37 F4.1 km/s e_RVel2G [4/37]? Error on RVel2-G
39- 43 F5.1 km/s RVel1R [-38.7/63.4] Radial velocity 1 (RAVESPAN)
45- 47 F3.1 km/s e_RVel1R [0.8/7] Error on RVel1-R
49- 54 F6.1 km/s RVel2R [-270/235]? Radial velocity 2 (RAVESPAN)
56- 59 F4.1 km/s e_RVel2R [2/19]? Error on RVel2-R
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- fID Frequency number identifier
5- 12 F8.5 /d Freq [1.15/52.4] Frequency
14- 20 F7.5 /d e_Freq [5e-05/0.0007] Error on Freq
22- 25 F4.2 mmag Amp [0.35/4.2] Amplitude
27- 30 F4.2 mmag e_Amp [0.04/0.05] Error on Amp
32- 35 F4.2 rad Phase [0.11/5.88] Phase
37- 40 F4.2 rad e_Phase [0.03/0.4] Error on Phase
42- 47 F6.2 --- S/N [14/194] Signal-to-Noise ratio
49- 54 F6.4 d Q [0.01/0.5] Q value
56- 58 A3 --- lN-RM l,N value in Radial Mode
60- 64 F5.3 d 100dQ-RM [0.01/0.09]? ΔQx100 in Radial Mode
66- 68 A3 --- lN-NM l,N value in Nonradial Mode
70- 74 F5.3 d 100dQ-NM [0.001/0.04]? ΔQx100 in Nonradial Mode
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d BJD [2448385/2458982] Barycentric Julian Date
14 A1 --- f_BJD [a] For flagged values the timings were not used
in our timing analysis (72 occurrences)
16- 21 F6.4 d e_BJD [0.0001/0.02]? Error on BJD
23- 29 F7.1 --- Epoch [-127/11565] Epoch of observation
31- 37 F7.4 --- O-C [-0.02/0.008] O-C value
39- 41 A3 --- Method CCD=electronic camera (180 occurrences),
PE=photoelectric (3 occurrences)
43- 44 A2 --- Type I=primary eclipse (113 occurrences),
II=secondary eclipse (70 occurrences)
46- 47 I2 --- Ref [1/25] References used
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- fID Frequency number identifier
6- 14 F9.5 /d Freq [0.02/105] Frequency
16- 22 F7.5 /d e_Freq [5e-05/0.009] Error on Freq
24- 27 F4.2 mmag Amp [0.03/4.2] Amplitude
29- 32 F4.2 mmag e_Amp [0.03/0.05] Error on Amp
34- 37 F4.2 rad Phase [0.1/6.3] Phase
39- 42 F4.2 rad e_Phase [0.03/5] Error on Phase
44- 49 F6.2 --- S/N [1.17/194] Signal-to-Noise ratio
51- 60 A10 --- Comb Combination
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref [1/25] Reference code
4- 23 A20 --- Author Main author of the reference
25- 43 A19 --- BIB BIBcode of the reference
45- 61 A17 --- Cat. Catalog in Vizier
63-101 A39 --- Note Additional note or comment
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 20-Jan-2023