J/AJ/144/37 BVRI photometry of the eclipsing binary BS Vul (Zhu+, 2012)
The photometric study of a neglected near contact binary: BS Vulpeculae.
Zhu L.-Y., Zejda M., Mikulasek Z., Liska J., Qian S.-B., de Villiers S.N.
<Astron. J., 144, 37 (2012)>
=2012AJ....144...37Z 2012AJ....144...37Z
ADC_Keywords: Binaries, eclipsing ; Photometry, CCD ; Photometry, UBVRI
Keywords: binaries: eclipsing - stars: evolution - stars: individual (BS Vul)
Abstract:
We present a detailed study of the close eclipsing binary BS
Vulpeculae. Although it is relatively bright (V: 10.9-11.6mag) and
belongs to short-periodic variable stars (P=0.48days), it is rather
neglected. To perform a thorough period analysis, we collected all
available photometric observations that span the time interval of
1898-2010. Observations include archive photographic plate
measurements and visually determined eclipse minima timings done in
1979-2003, which were later shown to be biased to accommodate the
existing linear ephemeris. Applying our own direct period analysis we
found a well-defined shortening of the orbital period of
dP/dt=-6.70(17)x10-11=-2.11(6)ms/yr, which implies a continual mass
flow from the primary to the secondary component. Using the 2003
version of the Wilson-Van Hamme code, our new complete BV(IR)C light
curves were analyzed and the physical parameters of the system were
derived. We found that BS Vul is a near contact binary system with the
primary component filling its critical Roche lobe. The luminosity
enhancement on the left shoulder of the secondary minimum shown in the
light curves can be explained as a result of a persistent hot spot on
the secondary due to the mass transfer from the primary component to
the secondary one and heating the facing hemisphere of the secondary
component, which is consistent with our result of period analysis.
With the period decrease, BS Vul will evolve toward the contact phase.
It is another good observational example as predicted by the theory of
thermal relaxation oscillations.
Description:
New observations of BS Vul were carried out on 2009 October 19, 22,
25, and 26 and 2010 November 4, 7, 10, and 11 with the PI1024 BFT
camera attached to the 85cm telescope in Xinglong Station of the
National Astronomical Observatory, China. A standard
Johnson-Cousins-Bessel multicolor CCD photometric system built on the
primary focus was used.
Objects:
--------------------------------------------------------------
RA (2000) DE Designation(s) (Period)
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19 37 26.51 +21 55 50.4 BS Vul=GSC 01614-00702 (P=0.48)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 23 6298 CCD photometric observations in BVIR bandpasses
for BS Vul observed in 2009 and 2010
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
J/AJ/143/34 : SZ Her BVRI light curves (Lee+, 2012)
J/AJ/142/99 : BVRI observations of TZ Boo (Christopoulou+, 2011)
J/AJ/142/12 : WZ Cyg BVRI light curves (Lee+, 2011)
J/AJ/141/44 : V396 Mon BVRI light curves (Liu+, 2011)
J/other/JAVSO/39.23 : Maxima of short period pulsating stars (Samolyk+, 2011)
J/other/JAVSO/38.183 : Time of minima of eclipsing binaries (Samolyk+, 2010)
J/MNRAS/407/497 : BVRI light curves of KZ Pav (Surgit+, 2010)
J/AJ/140/1150 : GSC 3355-0394 BVRI differential photometry (Samec+, 2010)
J/AJ/139/2669 : CL Aur BVRI light curves (Lee+, 2010)
J/AJ/139/1801 : XY UMa BVRI light curves (Yuan, 2010)
J/AJ/136/1667 : VV Vir BVRI differential photometry (Samec+, 2008)
J/MNRAS/379/1665 : XX Cep BVRI light curves (Lee+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- Filter Filter used in the observation (B, V, I or R)
3- 16 F14.6 d HJD Heliocentric Julian Date
18- 23 F6.3 mag Dmag Differential magnitude in Filter
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 23-Sep-2013