J/AJ/163/250 Light minimum times for 4 contact binaries (Yang+, 2022)
Magnetic Activity on Four Short-period Contact Binaries; V0576 Peg, KW Psc,
V0873 Per, and FY Boo.
Yang Y., Yuan H., Wang S., Dai H.
<Astron. J., 163, 250 (2022)>
=2022AJ....163..250Y 2022AJ....163..250Y
ADC_Keywords: Stars, double and multiple; Binaries, eclipsing; Photometry, UBVRI
Keywords: Eclipsing binary stars
Abstract:
We presented new photometry for four short-period late-type binaries,
observed by three small telescopes in China from 2020 September to
2021 December. Seven sets of light curves (including the TESS data for
FY Boo) were analyzed by using the W-D method. Three binaries (V0576
Peg, V0873 Per, and FY Boo) are W-type binaries with q∼2.5, while KW
Psc is an A-type binary with q∼0.43. Max.I-Max.II is up to 10% of
variable light amplitude for the asymmetric light curves, which are
modeled by a dark spot on the surface of the more massive component.
Photometric results imply the existence of movement and evolution of
the cool spot. From the temperature-luminosity and mass-luminosity
diagrams, the more massive components are a bit evolved main-sequence
stars, while the less massive ones are oversized and overluminous
owing to energy exchange. Orbital period analyses indicate that the
cyclic oscillations occur in the (O-C) curves. Their modulated periods
approach 11yr, which may preferably result from the magnetic activity
cycle for four late-type contact binaries. With angular momentum loss
through magnetic braking, these short-period contact binaries may
evolve into deep-contact configurations.
Description:
New observations of four contact binaries were performed on 14 nights
in 2020 and 2021 by using the 60cm, the 80cm, and the 85cm telescopes
at the Xinglong station (XLs) of National Astronomical Observatories,
Chinese Academy of Sciences (NAOC). All three telescopes are equipped
with the standard UBVRcIc multicolor photometric systems.
Objects:
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RA (2000) DE Designation(s)
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23 10 59.53 +21 42 43.2 V0576 Peg = RX J2311.0+2142
22 58 31.81 +05 52 24.0 KW Psc = ASAS J225832+0552.4
02 47 08.22 +41 22 31.9 V0873Per = V* V873 Per
13 46 51.81 +22 57 14.1 FY Boo = V* FY Boo
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 57 17 Seventeen light minimum times for V0576 Peg
table6.dat 57 31 All collected light minimum times for KW Psc
table7.dat 57 93 All available eclipse times of minimum light for
V0873 Per
table8.dat 57 69 All compiled light minimum times for FY Boo
refs.dat 108 47 References used in this work
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)
II/287 : Northern Sky Variability Survey (NSVS) (Wozniak+, 2004)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/A+A/311/523 : Photometry of W UMa (Maceroni+, 1996)
J/AcA/48/35 : All Sky Automated Survey variable stars (Pojmamski 1998)
J/AJ/119/1901 : ROTSE all-sky surveys for variable stars (Akerlof+, 2000)
J/A+A/406/535 : Hamburg/RASS Cat. of optical ident. V3.0 (Zickgraf+, 2003)
J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)
J/ApJ/629/1055 : Evolution of close binary systems (Yakut+, 2005)
J/other/IBVS/5731 : Minima and maxima of 816 variables (Hubscher+, 2006)
J/AcA/58/405 : ASAS eclipsing binaries RASS counterpart (Szczygiel+, 2008)
J/AJ/138/466 : NSVS variables automated classification (Hoffman+, 2009)
J/other/IBVS/5874 : Minima and maxima of 299 variables (Hubscher+, 2009)
J/other/RAA/9.1035 : RV light curves of 1RXS J201607.0+251645 (Li+, 2009)
J/AJ/138/680 : BVI TX Cnc light curves (Zhang+, 2009)
J/other/IBVS/5959 : Minima and maxima of 436 variables (Huebscher+, 2011)
J/AJ/146/35 : BVR light curves of DZ Psc (Yang+, 2013)
J/MNRAS/430/2029 : Initial masses of WUMa type contact binaries (Yildiz+, 2013)
J/AJ/148/126 : Light curves of four overcontact binaries (Caliskan+, 2014)
J/AJ/147/50 : Differential BVRI light curves of DV Psc (Pi+, 2014)
J/other/NewA/36.50 : V873 Per BVR light curves (Kriwattanawong+, 2015)
J/AJ/151/68 : Kepler Mission. VII. Eclipsing binaries in DR3 (Kirk+, 2016)
J/AJ/154/260 : 3 short-period eclipsing binaries BVRI photometry (Pi+, 2017)
J/ApJS/249/18 : The ZTF catalog of periodic variable stars (Chen+, 2020)
J/other/RAA/20.163 : Contact binaries in LAMOST DR7 (Qian+, 2020)
J/AJ/160/104 : EpsilonCrA components radial&orbital velocity (Rucinski, 2020)
J/ApJS/254/10 : Compilation of W UMa stars (Latkovic+, 2021)
J/AJ/162/63 : ZTF lightcurve 51 stars in 12 globular clusters (Ngeow+, 2021)
J/AJ/161/221 : Photometry & spectroscopy of 4 binaries stars (Panchal+, 2021)
Byte-by-byte Description of file: table[4678].dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
14- 19 F6.4 d e_HJD ? Error on HJD
21- 28 F8.1 --- Epoch Epoch time
30- 32 A3 --- Met Method used
34- 35 A2 --- Min Minimum eclipse-depth (I or II)
37- 43 F7.4 d O-Ci Initial residual
45- 51 F7.4 d O-Cf ? Final residual
53- 57 A5 --- Ref References used
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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- 5 A5 --- Ref Reference code
7- 28 A22 --- Author Main author
30- 48 A19 --- BIB BIBcode
50- 67 A18 --- Cat. Catalog in Vizier
69-108 A40 --- Note Additional note or comment
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 14-Oct-2022