J/other/ARep/68.886 V839 Cep UBVRIRcIc light curves (Volkov+, 2024)
V839 Cep - A new quadruple doubly eclipsing system.
Volkov I.M., Volkova A.S., Bagaev L.A.
<Astron. Reports, 68, 886-895 (2024)>
=2024ARep...68..886V 2024ARep...68..886V (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: photometric observations - binaries, eclipsing -
stars: fundamental parameters - stars: V839 Cep
Abstract:
New high-precision photometric measurements of the eclipsing star V839
Cep (P=9.96-day, V(A+B)=9.64mag, e=0.07, B6 V + B7 V), which is the A
component of the visual double star J21035+5925AB, have established
that component B is also an eclipsing variable (P=4.075-days, B9 V +
G8 V). For component A, the apsidal rotation rate was measured to be
dw/dt=0.028deg/year, which exceeds the theoretical value under the
condition of synchronism dw/dt=0.021 deg/year. The physical parameters
of the component stars of the eclipsing pair "A" were obtained:
T1=13200±300K, M1=(3.7±0.15)M☉, R1=(2.57±0.05)R☉,
T2=11900±250K, M2=(3.2±0.15)M☉, R2=(2.42±0.05)R☉,
and components of the eclipsing pair B: T1=10600±200K,
M1=(2.6±0.2)M☉, R1=(1.97±0.05)R☉, T2=5540±50K,
M2=(0.88±0.05)M☉, R2=(0.84±0.05)R☉ The age of the
system is determined to be 70 Myr with solar chemical composition. The
components of star "A" are pulsating variable stars of the slow Beta
Cephei (SBC) type.
Description:
U, B, V, Rc, R, Ic and I light curves of V839 Cep
Objects:
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RA (2000) DE Designation(s)
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21 03 31.71 +59 25 50.4 V839 Cep = ** MLR 243
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
uphot.dat 24 530 V839 Cep U light curve
bphot.dat 24 2480 V839 Cep B light curve
vphot.dat 24 3106 V839 Cep V light curve
rcphot.dat 25 1907 V839 Cep Rc light curve
rphot.dat 24 699 V839 Cep R light curve
icphot.dat 25 1897 V839 Cep Ic light curve
iphot.dat 24 659 V839 Cep I light curve
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Byte-by-byte Description of file: *phot.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian day for the middle of
the exposition
16- 22 F7.4 mag Dmag Difference of magnitudes between the
observation and mean plateau brightness (1)
24- 25 A2 --- Band Observed band
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Note (1): The plateau levels correspond to the magnitudes of the star which
are presented in Table 2 in the article and are given below:
U : 10.072 ± 0.015
B : 10.112 ± 0.004
V : 9.639 ± 0.002
Rc : 9.353 ± 0.020
R : 9.211 ± 0.007
Ic : 9.035 ± 0.024
I : 8.875 ± 0.011
U-B : -0.040 ± 0.014
B-V : 0.473 ± 0.004
V-Rc : 0.286 ± 0.020
V-R : 0.428 ± 0.007
Rc-Ic : 0.318 ± 0.020
R-I : 0.336 ± 0.008
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Acknowledgements:
Igor Volkov, hwp(at)yandex.ru
(End) Patricia Vannier [CDS] 11-Oct-2024