J/AJ/168/272 Transit times and LCs of 10 contact binary systems (Poro+, 2024)
BSN: The first photometric study of 10 contact binary systems from the northern
and southern hemispheres.
Poro A., Li K., Michel R., Castro A., Lajus E.F., Wang L.-H.,
Coliac J.-F., Aladag Y., Alizadehsabegh A., Alicavus F.
<Astron. J., 168, 272 (2024)>
=2024AJ....168..272P 2024AJ....168..272P
ADC_Keywords: Binaries, eclipsing; Stars, double and multiple;
Photometry, UBVRI
Keywords: Close binary stars ; CCD photometry ; Contact binary stars ;
Fundamental parameters of stars ; Astronomy data analysis
Abstract:
Photometric observations were made with standard filters in four
observatories for 10 contact binary systems. We analyzed the orbital
period variations of the systems and found that six of them show
long-term changes. The increase in the orbital period of the J07, N65,
and PU Vir systems is caused by mass transfer, and the reduction in
the orbital period of the J05, LO Psc, and N49 systems is caused by
the combination of angular momentum loss and mass transfer. The first
light-curve analysis was performed with the PHysics Of Eclipsing
BinariEs Python code and Markov Chain Monte Carlo. We discussed the
accuracy of photometric mass ratio estimates for contact binary
systems with total and partial eclipses compared to spectroscopic
results. We also compared our mass ratio findings to a recent method
that estimates mass ratios from the light curve's third derivative.
Then, we also discussed this new mass ratio estimate method for
photometric data. The systems' positions were displayed in 18
empirical parameter relationships. According to the light-curve
analysis and estimation of absolute parameters, systems BE Mus, J07,
J08, N49, and N65 are A subtypes, and the others are W subtypes.
Description:
Photometric observations and data reductions were made with different
standard filters for 10 target systems in four observatories in the
Northern and Southern Hemispheres. These observations were carried out
on 13 nights during the years 2023 and 2024.
The observations of BE Mus and PU Vir were made using the 2.15m Jorge
Sahade telescope at the Complejo Astronomico El Leoncito (CASLEO)
Observatory, Argentina, on 2024 March 10th and 8th respectively.
Standard BVRcIc filters were employed.
The five binary systems J05, J07, J08, N49, and N65 were observed at
the San Pedro Martir (SPM) Observatory in Mexico. A 0.84m
Ritchey-Chretien telescope (f/15) and BVRcIc standard filters
were used. The observations were conducted on December 7th 2023,
January 27th 2024, January 30th 2024, January 26th 2024, and November
22nd 2023 respectively.
The observations of LO Psc were carried out by a 0.5m
Ritchey-Chretien RC 500/4000 Pro RC SGA OTA (f/8) telescope at the
UZAYMER Observatory, Cukurova University, Adana, Turkiye, using
standard filters V and Rc. The observations happened on October 13th
and 23rd 2023.
The OT UMa and V0801 And binary systems were observed at the
Observatoire Astronomique des Binaires Andre Coliac (OABAC)
observatory in Marseille, France. We used a Newton 200mm (f/4)
telescope with a field corrector in the observation process.
Standard VIc filters were used for OT UMa, and standard BVRc
filters for V0801 And. The observations took place on January 26th and
February 10th 2023 for OT UMa, and November 15th and 17th 2023 for
V0801 And.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
targets.dat 9 10 List of targets and their light curves (Table
added by CDS)
table5.dat 58 1445 The times of minima extracted from our observations
and space-based data and collected from the
literature
fig4.dat 97 1814 Binary systems' observed and final synthetic light
curves
--------------------------------------------------------------------------------
See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/A+AS/141/371 : Low-mass stars evol. tracks & isochrones (Girardi+, 2000)
J/A+A/426/1001 : Catalog of contact binary stars (Csizmadia+, 2004)
J/ApJ/629/1055 : Evolution of close binary systems (Yakut+, 2005)
J/other/PASA/23.154 : BV LCs of XY Leo, EE Cet, AQ Psc (Djurasevic+ 2006)
J/MNRAS/373/1483 : W UMa type and CAB stars dynamical evolution (Eker+, 2006)
J/AJ/131/621 : Catalog of 1022 bright contact binary stars (Gettel+, 2006)
J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)
J/AJ/133/1470 : TAROT suspected variable star catalog (Damerdji+, 2007)
J/A+A/465/943 : BVI and RV curves of 5 eclipsing binaries (Szalai+, 2007)
J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)
J/AJ/137/3655 : Radial velocities of 8 close binaries (Pribulla+, 2009)
J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)
J/AJ/143/99 : Photometry of W UMa eclipsing binaries (Terrell+, 2012)
J/AN/334/860 : Catalogue of eclipsing variables. v2 (Avvakumova+, 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/MNRAS/465/4678 : 9380 contact binaries from CRTS VSC (Marsh+, 2017)
J/MNRAS/479/5491 : Absolute parameters of 509 main-sequence stars (Eker+, 2018)
J/AJ/156/102 : TESS Input Catalog & Candidate Target List (Stassun+, 2018)
J/ApJ/867/105 : ATLAS all-sky stellar ref. cat. ATLAS-REFCAT2 (Tonry+, 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/ApJS/247/50 : Late-type contact binaries in CSS DR1 (Sun+, 2020)
J/ApJS/254/10 : Compilation of W UMa stars (Latkovic+, 2021)
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/672/A176 : Mass-ratio distribution: contact binary stars (Pesta+, 2023)
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
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID System identifier
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID System identifier
11- 22 F12.4 d BJD [2452407/2460378] Barycentric Julian
Date (TDB) of minimum
24- 29 F6.4 d e_BJD [1e-4/5e-3] Uncertainty in BJD
31- 38 F8.1 --- Epoch [-31103/47] Epoch number
40- 46 F7.4 --- (O-C) [-0.07/0.03] The (O-C) value, observed minus
collected from literature
48- 59 A12 --- Source Source for the minimum data (1)
--------------------------------------------------------------------------------
Note (1): Sources as follows:
AAVSO = American Association of Variable Star Observers,
Variable Star indeX (VSX) catalog (Watson+2006, B/vsx);
10 occurrences
ASAS-SN = All Sky Automated Survey for SuperNovae catalog
(Shappee+2014, J/ApJ/788/48; Jayasinghe+2018, II/366);
23 occurrences
O-C gateway = Online catalog of stars and exoplanets ran by the Czech
Astronomical Society (http://var2.astro.cz/ocgate/);
32 occurrences
SuperWASP = Wide Angle Search for Planets catalog
(Butters+, 2010A&A...520L..10B 2010A&A...520L..10B); 363 occurrences
TESS = Transiting Exoplanet Survey Satellite (TESS Input Catalog v8.2;
Paegert+2021, IV/39); 982 occurrences
ZTF = Zwicky Transient Facility catalog (Chen+2020, J/ApJS/249/18);
25 occurrences
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID System identifier
11- 17 F7.4 --- IcPhase [-0.1/0.9]? Ic band phase
19- 24 F6.4 --- IcFlux [0.6/1]? Normalized Ic (786.5nm) band flux
26- 31 F6.4 --- e_IcFlux [1e-3/0.11]? Uncertainty in I-Flux
33- 39 F7.4 --- RcPhase [-0.1/0.9]? Rc band phase
41- 46 F6.4 --- RcFlux [0.5/1]? Normalized Rc (647nm) band flux
48- 53 F6.4 --- e_RcFlux [1e-4/0.11]? Uncertainty in R-Flux
55- 61 F7.4 --- VPhase [-0.1/0.9]? V band phase
63- 68 F6.4 --- VFlux [0.5/1]? Normalized V (540nm) band flux
70- 75 F6.4 --- e_VFlux [1e-3/0.93]? Uncertainty in V-Flux
77- 83 F7.4 --- BPhase [-0.1/0.9]? B band phase
85- 90 F6.4 --- BFlux [0.6/1]? Normalized B (442nm) band flux
92- 97 F6.4 --- e_BFlux [1e-3/1]? Uncertainty in B-Flux
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Robin Leichtnam [CDS] 02-Sep-2025