J/AJ/143/34 SZ Her BVRI light curves (Lee+, 2012)
The Algol system SZ Herculis: physical nature and orbital behavior.
Lee J.W., Lee C.-U., Kim S.-L., Kim H.-I., Park J.-H.
<Astron. J., 143, 34 (2012)>
=2012AJ....143...34L 2012AJ....143...34L
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI ; Photometry, CCD
Keywords: binaries: close - binaries: eclipsing - stars: individual: SZ Her
Abstract:
Multiband CCD photometric observations of SZ Her were obtained between
2008 February and May. The light curve was completely covered and
indicated a significant temperature difference between both
components. The light-curve synthesis presented in this paper
indicates that the eclipsing binary is a classical Algol-type system
with parameters of q=0.472, i=87.57°, and
Δ(T1-T2)=2381K; the primary component fills approximately
77% of its limiting lobe and is slightly larger than the lobe-filling
secondary component. More than 1100 times of minimum light spanning
more than a century were used to study an orbital behavior of the
binary system. It was found that the orbital period of SZ Her varied
due to a combination of two periodic variations with cycle lengths of
P3=85.8yr and P4=42.5yr and semi-amplitudes of K3=0.013days and
K4=0.007days, respectively. The most reasonable explanation for
these variations is a pair of light-time effects driven by the
possible existence of two M-type companions with minimum masses of
M3=0.22M☉ and M4=0.19M☉ that are located close to the
2:1 mean motion resonance. If two additional bodies exist, then the
overall dynamics of the multiple system may provide a significant clue
to the formation and evolution of the eclipsing pair.
Description:
We performed new CCD photometry of SZ Her on 13 nights from 2008
February 28 through May 17. The observations were taken with a SITe 2K
CCD camera and a BVRI filter set attached to the 61cm reflector at
Sobaeksan Optical Astronomy Observatory (SOAO) in Korea.
Objects:
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RA (2000) DE Designation(s) (Period)
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17 39 36.81 +32 56 46.8 SZ Herculis = HIP 86430 (P=0.81808)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 80 439 CCD photometric observations of SZ Her
table5.dat 23 79 New times of minimum light for SZ Her
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See also:
V/124 : Approximate elements of eclipsing binaries (Svechnikov+, 1990)
V/115 : Semi-detached eclipsing binaries (Surkova+, 2004)
J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)
J/other/IBVS/5543 : 163-nd list of minima of EBs (Diethelm+, 2004)
J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)
J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)
J/MNRAS/370/2013 : Catalogue of close binaries (Soydugan+, 2006)
J/MNRAS/379/1665 : XX Cep BVRI light curves (Lee+, 2007)
J/AJ/137/3181 : HW Vir differential VR light curves (Lee+, 2009)
J/AJ/139/2669 : CL Aur BVRI light curves (Lee+, 2010)
J/MNRAS/407/497 : BVRI light curves of KZ Pav (Surgit+, 2010)
J/AJ/142/12 : WZ Cyg BVRI light curves (Lee+, 2011)
J/other/JAVSO/38.183 : Time of minima of eclipsing binaries (Samolyk+, 2010)
J/other/IBVS/5959 : Minima and maxima of 436 variables (Huebscher+, 2011)
J/other/JAVSO/39.23 : Maxima of short period pulsating stars (Samolyk+, 2011)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD-B ? B band Heliocentric Julian Date observations
15- 20 F6.3 mag DBmag [-0.575/1.48]? Differential B band magnitude
22- 34 F13.5 d HJD-V ? V band Heliocentric Julian Date observations
36- 40 F5.3 mag DVmag [0.032/1.833]? Differential V band magnitude
42- 54 F13.5 d HJD-R R band Heliocentric Julian Date observations
56- 60 F5.3 mag DRmag [0.372/1.991] Differential R band magnitude
62- 74 F13.5 d HJD-I ? I band Heliocentric Julian Date observations
76- 80 F5.3 mag DImag [0.678/2.123]? Differential I band magnitude
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d HJD Heliocentric Julian Date of minimum (HJD-2450000)
12 A1 --- n_HJD [a] Origin of minimum (1)
14- 20 F7.5 d e_HJD Uncertainty on HJD
22- 23 A2 --- Min [I II] Type of minimum
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Note (1): a = SOAO minimum epochs. The others are from the WASP public data
(Butters et al., 2010A&A...520L..10B 2010A&A...520L..10B)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 10-Apr-2013