J/AJ/148/126 Light curves of four overcontact binaries (Caliskan+, 2014)
Photometric analysis of overcontact binaries AK Her, HI Dra, V1128 Tau, and
V2612 Oph.
Caliskan S., Latkovic O., Djurasevic G., Ozavci I., Basturk O., Cseki A.,
Senavci H.V., Kilicoglu T., Yilmaz M., Selam S.O.
<Astron. J., 148, 126 (2014)>
=2014AJ....148..126C 2014AJ....148..126C
ADC_Keywords: Binaries, eclipsing ; Photometry, CCD ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing -
stars: fundamental parameters -
stars: individual: (AK Her,HI Dra,V1128 Tau,V2612 Oph)
Abstract:
We analyze new, high quality multicolor light curves of four
overcontact binaries: AK Her, HI Dra, V1128 Tau, and V2612 Oph, and
determine their orbital and physical parameters using the modeling
program of G. Djurasevic and recently published results of radial
velocity studies. The achieved precision in absolute masses is between
10% and 20%, and the precision in absolute radii is between 5% and
10%. All four systems are W UMa-type binaries with bright or dark
spots indicative of mass and energy transfer or surface activity. We
estimate the distances and the ages of the systems using the
luminosities computed through our analysis, and perform an O-C study
for V1128 Tau, which reveals a complex period variation that can be
interpreted in terms of mass loss/exchange and either the presence of
the third body, or the magnetic activity on one of the components. We
conclude that further observations of these systems are needed to
deepen our understanding of their nature and variability.
Description:
We obtained CCD photometric observations of our objects with the
Apogee ALTA U47 CCD camera attached to the 40cm Schmidt-Cassegrain
telescope at the Ankara University Kreiken Observatory (AUKR), using
the wideband BVRI filters of the Johnson-Cousins system.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 4 Summary of observational aspects
table3.dat 38 7111 BVRI photometry of AK Her, HI Dra, V1128 Tau, V2612 Oph
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013
V/119 : Catalogue of field contact binary stars (Pribulla+, 2003)
V/120 : Catalog of early-type contact binaries (Bondarenko+, 1996)
J/AJ/145/80 : Light curves of HS Aqr, EG Cep, VW LMi, DU Boo
(Djurasevic+, 2013)
J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)
J/AJ/137/3655 : Radial velocities of 8 close binaries (Pribulla+, 2009)
J/AJ/136/586 : Radial velocities of 10 close binaries (Rucinski+, 2008)
J/AJ/132/769 : Radial velocities of 10 close binaries (Pribulla+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 23 A13 --- CName Name of the comparison star
25- 29 F5.3 mag sig.B Standard deviation of the B light curve residual
31- 35 F5.3 mag sig.V Standard deviation of the V light curve residual
37- 41 F5.3 mag sig.R Standard deviation of the R light curve residual
43- 47 F5.3 mag sig.I ? Standard deviation of the I light curve residual
49- 60 F12.4 d T0 Epoch of minimum
62- 67 F6.4 d e_T0 Error in HJD
69- 76 F8.6 d Per Orital period
78- 85 F8.6 d e_Per Error in Per
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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 A9 --- Name Star name (AK Her, HI Dra, V1128 Tau, V2612 Oph)
11 A1 --- Flt [BVRI] Filter used (Johnson-Cousins B, V, R or I)
13- 24 F12.4 d HJD Heliocentric Julian Date of observation
26- 31 F6.4 --- Phase [0/1] Phase
33- 38 F6.3 mag Dmag [-1.2/1.168] Differential magnitude in Filter
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 16-Dec-2014