J/AJ/170/214 BSN. II. Timing & LCs of 8 eclipsing contact binaries (Poro+, 2025)
BSN.
II. The first light curve study of eight total eclipsing contact binary
stars with shallow fillout factors.
Poro A., Li K., Michel R., Wang L.-H., Alicavus F., Najera M.R.,
Santillan-Ortega P., Tamayo F.J., Aceves H.
<Astron. J., 170, 214 (2025)>
=2025AJ....170..214P 2025AJ....170..214P
ADC_Keywords: Binaries, eclipsing; Stars, double and multiple;
Photometry, UBVRI
Keywords: Eclipsing binary stars ; Close binary stars ;
Fundamental parameters of stars ; Astronomy data analysis
Abstract:
This study provides the first comprehensive analysis of eight
total-eclipse W Ursae Majoris-type contact binary systems.
Ground-based photometric multiband observations were conducted at a
Mexican observatory, and new times of minima were extracted. The O-C
analysis reveals that four of our target binaries exhibit a long-term
increase in their orbital periods, while the others show a long-term
decrease in their orbital periods. We analyzed the light curves using
the PHOEBE Python code and BSN application. Among the target systems,
two required the inclusion of a cold starspot on one of the components
to achieve an adequate fit. The light curve analysis revealed that the
target systems exhibit a shallow fillout factor. Absolute parameters
were estimated using the Gaia DR3 parallax and astrophysics equations.
Considering the effective temperatures and component masses, each
system was classified as either the A- or W-subtype. The stellar
evolution of the systems was represented through the mass-radius and
mass-luminosity diagrams. Additionally, we calculated the initial
masses of the companion stars and the total mass lost for each target
system.
Description:
Ground-based observations from this study were carried out at the San
Pedro Martir Observatory in Mexico, using the 0.84m Ritchey-Chretien
telescope. Observations were performed using B (442nm), V (540nm),
Rc (647nm), and Ic (786.5nm) standard filters.
We collected as many eclipse timings as possible by using the data of
photometric surveys including the All Sky Automated Survey for
SuperNovae catalog (ASAS-SN; Jayasinghe+2018, II/366), the Zwicky
Transient Facility catalog (ZTF; Chen+2020, J/ApJS/249/18), the
Transiting Exoplanet Survey Satellite (TESS Input Catalog v8.2;
Paegert+2021, IV/39), Wide Angle Search for Planets (SuperWASP;
Butters+, 2010A&A...520L..10B 2010A&A...520L..10B), and the American Association of
Variable Star Observers catalog (AAVSO; Watson+2006, B/vsx).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
targets.dat 36 8 List of targets (added by CDS)
table4.dat 72 462 Times of minima
lc/* . 8 Individual light curve files in MRT format
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
II/287 : Northern Sky Variability Survey (NSVS) (Wozniak+, 2004)
II/328 : AllWISE Data Release (Cutri+ 2013)
II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/AJ/119/1901 : ROTSE all-sky surveys for variable stars (Akerlof+, 2000)
J/A+AS/141/371 : Low-mass stars evolut. tracks & isochrones (Girardi+, 2000)
J/ApJ/629/1055 : Evolution of close binary systems (Yakut+, 2005)
J/MNRAS/373/1483 : W UMa type and CAB stars dynamical evolution (Eker+, 2006)
J/AJ/131/621 : A catalog of 1022 bright contact binary stars (Gettel+, 2006)
J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)
J/AJ/146/101 : LINEAR. III. Catalog of periodic variables (Palaversa+, 2013)
J/MNRAS/430/2029 : Initial masses of W UMa type contact binar. (Yildiz+, 2013)
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/AJ/153/231 : BVR photometry of EPIC 211957146 (Sriram+, 2017)
J/ApJS/237/28 : WISE catalog of periodic variable stars (Chen+, 2018)
J/MNRAS/479/5491 : Absolute parameters of 509 main-sequence stars (Eker+, 2018)
J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)
J/AJ/159/189 : Eclipse timings for 9 contact binaries (Li+, 2020)
J/other/RAA/20.163 : Contact binaries in LAMOST DR7 (Qian+, 2020)
J/AJ/162/13 : Parameters estimation for 173 eclipsing binaries (Li+, 2021)
J/AJ/164/202 : Extremely Low Mass Ratio Contact Binar. I. 10 syst. (Li+, 2022)
J/A+A/674/A33 : Gaia synthetic phot. cat. of white dwarfs (Gaia Coll., 2023)
J/A+A/675/A195 : ZTF DR11 classification in ZTF/4MOST sky (Sanchez-Saez+, 2023)
J/A+A/672/A176 : Mass-ratio distribution: contact binary stars (Pesta+, 2023)
J/AJ/168/272 : BSN. I. Transit times & LCs 10 contact binary syst (Poro+, 2024)
J/ApJS/271/32 : ASAS-SN eclipsing contact binaries with Gaia DR3 (Li+, 2024)
http://var2.astro.cz/ocgate/ : O-C Gateway (Czech Astronomical Society)
Byte-by-byte Description of file: targets.dat
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Bytes Format Units Label Explanations
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1- 21 A21 --- System System name
23- 26 A4 --- Bands Light curve bands (1)
28- 36 A9 --- File Link to the light curve file in MRT format
(Data behind Figure 3) (2)
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Note (1): The observations were carried out at the San Pedro Martir Observatory
in Mexico, using the 0.84m Ritchey-Chretien telescope with the B (442nm),
V (540nm), Rc (647nm), and Ic (786.5nm) standard filters.
Note (2): Specifically, the files contain the observed, phased light curves of
the eight total eclipsing contact binary stars. The band fluxes have been
normalized.
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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- 21 A21 --- System System name
23- 35 F13.5 d BJD [2453920/2460560] Barycentric Julian date of
minima
37- 43 F7.5 d e_BJD [8e-5/0.023] Uncertainty in BJD
45- 52 F8.1 --- Epoch [-23167/0.5] Epoch Number
54- 61 F8.5 d O-C [-0.057/0.018] Minima residual, days
63- 72 A10 --- Source Source (1)
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Note (1): Sources as follows:
AAVSO = American Association of Variable Star Observers,
Variable Star indeX (VSX) catalog (Watson+2006, B/vsx);
3 occurrences
ASAS-SN = All Sky Automated Survey for SuperNovae catalog
(Shappee+2014, J/ApJ/788/48; Jayasinghe+2018, II/366);
32 occurrences
SuperWASP = Wide Angle Search for Planets catalog
(Butters+, 2010A&A...520L..10B 2010A&A...520L..10B); 161 occurrences
TESS = Transiting Exoplanet Survey Satellite (TESS Input Catalog v8.2;
Paegert+2021, IV/39); 205 occurrences
ZTF = Zwicky Transient Facility catalog (Chen+2020, J/ApJS/249/18);
44 occurrences
This study = Observations from the 0.84m telescope at the San Pedro Martir
Observatory in Mexico; 17 occurrences
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History:
From electronic version of the journal
License: CC-BY-4.0
References:
Poro et al. Pap I 2024AJ....168..272P 2024AJ....168..272P J/AJ/168/272
Poro et al. Pap II 2025AJ....170..214P 2025AJ....170..214P This catalog
(End) Robin Leichtnam [CDS] 15-Jul-2026