J/AJ/141/44 V396 Mon BVRI light curves (Liu+, 2011)
Period changes and four-color light curves of the active overcontact
binary V396 Monocerotis.
Liu L., Qian S.-B., Liao W.-P., He J.-J., Zhu L.-Y., Li L.-J., Zhao E.-G.
<Astron. J., 141, 44 (2011)>
=2011AJ....141...44L 2011AJ....141...44L
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: evolution -
stars: individual (V396 Mon)
Abstract:
This paper analyzes the first obtained four-color light curves of V396
Mon using the 2003 version of the W-D code. It is confirmed that V396
Mon is a shallow W-type contact binary system with a mass ratio
q=2.554(±0.004) and a degree of contact factor f=18.9%(±1.2%). A
period investigation based on all available data shows that the period
of the system includes a long-term decrease
(dP/dt=-8.57x10-8days/yr) and an oscillation (A3=0.0160day,
T3=42.4yr). They are caused by angular momentum loss and light-time
effect, respectively. The suspect third body is possibly a small
M-type star (about 0.31 solar mass).
Description:
We carried out new CCD photometric observations of V396 Mon in the
BVRI bands on 2009 November 16 and 17, using the 1024x1024 PI1024
BFT camera attached to the 85cm telescope at the Xinglong Station of
the National Astronomical Observatories of Chinese Academy of
Sciences. The filter system was a standard Johnson-Cousins-Bessel
multicolor CCD photometric system built on the primary focus.
Objects:
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RA (2000) DE Designation(s)
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06 38 36.48 +03 36 17.1 V396 Mon = SV* HBV 379
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 20 289 The original data of V396 Mon in the B band
table2.dat 20 291 The original data of V396 Mon in the V band
table3.dat 20 290 The original data of V396 Mon in the R band
table4.dat 20 291 The original data of V396 Mon in the I Band
table5.dat 35 14 New CCD times of light minimum for V396 Mon
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Byte-by-byte Description of file: table1.dat table2.dat table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julain date (245515?.????) (1)
14- 18 F5.3 mag Dmag Differential magnitude in Band
20 A1 --- Band [BVRI] Observed band
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Note (1): Observed by the 85cm Telescope at Xinglong Base, National Observatory.
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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- 13 F13.5 d HJD Heliocentric Julain date
15- 21 F7.5 d e_HJD rms uncertainty on HJD
23- 25 A3 --- Meth [CCD] Method
27- 28 A2 --- Min [I II] Type of minimum
30 A1 --- Filt [BVRI] Filter
32- 35 A4 --- Tel Telescope (1)
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Note (1): Telescopes as follows:
1m = 1m R-C reflect telescope in Yunnan Observatory
85cm = 85cm reflect telescope in Xinglong Observation base
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Jul-2012