J/AJ/159/24 Spectroscopy & Kepler data of the EB star V404 Lyr (Lee+, 2020)
Absolute properties of the eclipsing γ Dor star V404 Lyrae.
Lee J.W., Hong K., Koo J.-R., Park J.-H.
<Astron. J., 159, 24 (2020)>
=2020AJ....159...24L 2020AJ....159...24L
ADC_Keywords: Binaries, eclipsing; Spectra, optical; Radial velocities;
Asteroseismology
Keywords: Eclipsing binary stars ; Fundamental parameters of stars ;
Stellar oscillations ; Spectroscopy ; Multi-periodic pulsation ;
Asteroseismology
Abstract:
We present the first high-resolution spectra for the eclipsing binary
V404Lyr showing γDor pulsations, which we use to study its
absolute properties. By fitting models to the disentangling spectrum
of the primary star, we found that it has an effective temperature of
Teff,1=7330±150K and a rotational velocity of
v1sini=148±18km/s. The simultaneous analysis of our double-lined
radial velocities and the pulsation-subtracted Kepler data gives us
accurate stellar and system parameters of V404Lyr. The masses, radii,
and luminosities are M1=2.17±0.06M☉,
R1=1.91±0.02R☉, and L1=9.4±0.8L☉ for the primary,
and M2=1.42±0.04M☉, R2=1.79±0.02R☉, and
L2=2.9±0.2L☉ for the secondary. The tertiary component
orbiting the eclipsing pair has a mass of M3b=0.71±0.15M☉
in an orbit of P3b=642±3d, e3b=0.21±0.04, and
a3b=509±2R☉. The third light of l3=4.1±0.2% could be
partly attributable to the K-type circumbinary object. By applying a
multiple frequency analysis to the eclipse-subtracted light residuals,
we detected 45 frequencies with signal-to-noise amplitude ratios
larger than 4.0. Identified as independent pulsation modes, seven
frequencies (f1-f6, f9), their new pulsation constants, and the
location in the Hertzsprung-Russell diagram indicate that the
pulsating primary is a γDor-type variable star.
Description:
The Kepler satellite observed our program target V404 Lyr in
long-cadence mode almost continuously from Q0 to Q17 (May 2009 -
Apr 2013). In this work, we used the simple aperture photometry (SAP)
data retrieved from the Mikulski Archive for Space Telescopes (MAST)
archive. After the removal of obvious outliers filtered with 5σ
clipping by visual inspection, the resultant Kepler observations
comprise 65,901 data points, spanning ∼1470 days.
High-resolution spectroscopy of V404Lyr was carried out between 2016
and 2018 April to measure the atmospheric parameters and radial
velocities (RVs) of the component stars. The observations were made
with the fiber-fed echelle spectrograph, the Bohyunsan Optical Echelle
Spectrograph (BOES), attached to the 1.8m reflector at Bohyunsan
Optical Astronomy Observatory (BOAO) in Korea. A total of 52 spectra
were obtained using the largest fiber, with a spectral resolution of
R=30000. The exposure times of the pulsating EB were 1200s to avoid
orbital smearing, corresponding to 0.019 of the binary orbital period.
Objects:
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RA (2000) DE Designation(s) (Porb)
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19 19 05.95 +38 22 00.5 V404Lyr = TYC 3121-1291-1 (P=0.73094)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 33 52 Radial velocities of V404 Lyr
table4.dat 32 195 Epoch and spot parameters for 195 datasets at
intervals of 10 orbital periods
table5.dat 58 45 Multiple Frequency Analysis of V404 Lyr
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/AJ/129/2815 : Eleven new γ Doradus variables (Henry+, 2005)
J/AJ/141/83 : Kepler Mission. I. Eclipsing binaries in DR1 (Prsa+, 2011)
J/AJ/142/160 : Kepler Mission. II. Eclipsing binaries in DR2 (Slawson+, 2011)
J/ApJS/199/30 : Effective temperature scale for KIC stars (Pinsonneault+, 2012)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/AJ/148/37 : Long-term photometric behavior of V404 Lyr (Lee+, 2014)
J/ApJ/833/170 : Spots parameters for LCs of the EB star KIC 6048106 (Lee, 2016)
J/ApJ/835/189 : KIC 11401845 eclipse timings (Lee+, 2017)
J/ApJ/846/115 : V-band photometry and RVs of V482 Persei system (Torres+, 2017)
http://archive.stsci.edu/kepler/ : Kepler archive on MAST
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 --- BJD [7497/8229] Barycentric Julian Date; BJD-2450000
11- 16 F6.1 km/s RV1 [-162/124] Radial velocity of the
primary component (V1)
18- 21 F4.1 km/s e_RV1 [4/14] Standard deviation (σ1)
23- 28 F6.1 km/s RV2 [-232/203]? Radial velocity of the
secondary component (V2)
30- 33 F4.1 km/s e_RV2 [5/26]? Standard deviation (σ2)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD [2454957/2456422] Barycentric Julian Date
15- 20 F6.2 deg Long [0.04/360] Longitude
22- 26 F5.2 deg ARad [19/31] Angular radius
28- 32 F5.3 --- T [0.83/1.1] Temperature factor; Tspot/Tlocal
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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 --- IDf Frequency identification (f1 to f45)
5- 12 F8.5 d-1 Freq [0.6/11] Frequency
14- 20 F7.5 d-1 e_Freq [1e-05/6e-05] Error on Freq (1)
22- 25 F4.2 mmag Amp [0.39/6.4] Amplitude
27- 30 F4.2 mmag e_Amp [0.04/0.24] Error on Amp (1)
32- 35 F4.2 rad Phase [0.05/6.3] Phase
37- 40 F4.2 rad e_Phase [0.09/1.3] Error on Phase (1)
42- 46 F5.2 --- S/N [4.2/74] Signal to noise ratio
48- 58 A11 --- Comm Remarks: possible harmonic and combination
frequencies
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Note (1): Uncertainties were calculated according to
Kallinger+ (2008A&A...481..571K 2008A&A...481..571K).
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History:
From electronic version of the journal
(End) Prepared by [AA], Coralie Fix [CDS], 11-Mar-2020