J/AJ/160/49 LOAO BV-bands photometry and BOES RVs of WASP 0131+28 (Lee+, 2020)
The pre-He white dwarfs in eclipsing binaries. I. WASP 0131+28.
Lee J.W., Koo J.-R., Hong K., Park J.-H.
<Astron. J., 160, 49 (2020)>
=2020AJ....160...49L 2020AJ....160...49L
ADC_Keywords: Stars, double and multiple; Stars, white dwarf; Spectra, optical;
Photometry; Radial velocities
Keywords: Eclipsing binary stars ; Fundamental parameters of stars ;
CCD photometry ; Spectroscopy ; Stellar evolution ; White dwarf stars
Abstract:
We report the first BV light curves and high-resolution spectra of the
post-mass transfer binary star WASP0131+28 to study the absolute
properties of extremely low-mass white dwarfs. From the observed
spectra, the double-lined radial velocities were derived, and the
effective temperature and rotational velocity of the brighter, more
massive primary were found to be Teff1=10000{±]200K and
v1sini=55±10km/s, respectively. The combined analysis of the
Transiting Exoplanet Survey Satellite (TESS) archive data and ours
yielded the accurate fundamental parameters of the program target. The
masses were derived to about 1.0% accuracy and the radii to 0.6%, or
better. The secondary component's parameters of
M2=0.200±0.002M☉, R2=0.528±0.003R☉,
Teff2=11186±235K, and L2=3.9±0.3L☉ are in excellent
agreement with the evolutionary sequence for a helium-core white dwarf
of mass 0.203M_☉, and indicates that this star is halfway through
the constant luminosity phase. The results presented in this article
demonstrate that WASP0131+28 is an EL CVn eclipsing binary in a thin
disk, which is formed from the stable Roche-lobe overflow channel and
composed of a main-sequence dwarf with a spectral type A0 and a pre-He
white dwarf.
Description:
The photometric BV images were taken from 2016 to 2017 on the 1.0m
telescope at Mt. Lemmon Optical Astronomy Observatory (LOAO) in
Arizona, USA. We obtained 12708 individual observations (6372 in B and
6336 in V).
Fifty high-resolution spectra were secured from 2016 to 2019 with the
1.8m telescope and fiber-fed echelle spectrograph Bohyunsan Optical
Echelle Spectrograph (BOES) at Bohyunsan Optical Astronomy Observatory
(BOAO) in Korea. The exposure times of our program target was mostly
set to be 40 minutes (R=30000). Almost all spectra have an S/N larger
than 40 (on average 55) at around 5500Å.
Objects:
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RA (2000) DE Designation(s) (Period)
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01 31 29.77 +28 03 36.6 WASP 0131+28 = TIC 18225199 (P=1.8827597)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 41 6372 CCD photometric data of WASP 0131+28 observed at
Mt. Lemmon Optical Astronomy Observatory (LOAO)
table3.dat 34 50 Radial velocities of WASP 0131+28 with Bohyunsan
Optical Echelle Spectrograph (BOES)
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/A+A/339/123 : PSR J1012+5307 evolutionary tracks (Driebe+ 1998)
J/A+A/447/173 : 3D-kinematics white dwarfs from SPY project. II. (Pauli+, 2006)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/AJ/143/95 : Transit light curves of HAT-P-12 (Lee+, 2012)
J/A+A/557/A19 : Mass and age of extreme low-mass white dwarfs (Althaus+, 2013)
J/A+A/557/A79 : Spectra of KIC10661783 (Lehmann+, 2013)
J/AJ/147/104 : Photometry and velocities of 1SWASP J093010A and B (Koo+, 2014)
J/ApJ/835/189 : KIC 11401845 eclipse timings (Lee+, 2017)
J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD-B [2457710/2458114] Barycentric Julian Date of B band
observation
15- 20 F6.3 mag Bmag [10.87/11.06] Standard B band magnitude
22- 34 F13.5 d BJD-V [2457710/2458114]? Barycentric Julian Date of V band
observation
36- 41 F6.3 mag Vmag [10.78/10.97]? Standard V band magnitude
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 d BJD [408/1785] Barycentric Julian Date; BJD-2457000
11- 16 F6.2 km/s RVel1 [-29.4/13.9] Radial velocity of component 1
18- 21 F4.2 km/s e_RVel1 [0.22/0.77] Error on RVel1 (σ1)
23- 29 F7.2 km/s RVel2 [-213/194] Radial velocity of component 2
31- 34 F4.2 km/s e_RVel2 [0.78/2.7] Error on RVel2 (σ2)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 16-Oct-2020