J/AJ/147/91 Differential BVR light curves of V407 Peg (Lee+, 2014)
Physical nature and timing variations of the eclipsing system V407 Pegasi.
Lee J.W., Park J.-H., Hong K., Kim S.-L., Lee C.-U.
<Astron. J., 147, 91 (2014)>
=2014AJ....147...91L 2014AJ....147...91L
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI ; Photometry, CCD
Keywords: binaries: eclipsing - stars: individual: V407 Peg -
stars: fundamental parameters - starspots
Abstract:
New multiband CCD photometry is presented for V407 Peg; the RC light
curves are the first ever compiled. Our light curves, displaying a
flat bottom at secondary minimum and an O'Connell effect, were
simultaneously analyzed with the radial velocity (RV) curves given by
Rucinski et al. The light changes of the system are best modeled using
both a hot spot on the secondary star and a third light. The model
also represents historical light curves. All available minimum epochs,
including our six timing measurements, have been examined and they
indicate that the eclipse timing variation is mainly caused by light
asymmetries due to the spot activity detected in the light-curve
synthesis. The hot spot may be produced as a result of the impact of
the gas stream from the primary star. Our light and velocity solutions
indicate that V407 Peg is a totally eclipsing A-type overcontact
binary with values of q=0.251, i=87.6°, ΔT=496K, f=61%, and
l3=11∼16%. Individual masses and radii of both components are
determined to be M1=1.72M☉, M2=0.43M☉,
R1=2.15R☉, and R2=1.21R☉. These results are very
different from previous ones, which is probably caused by the light
curves with distorted and inclined eclipses used in those other
analyses. The fact that there are no objects optically related to the
system and that the seasonal RVs show a large discrepancy in systemic
velocity indicates that the third light source most likely arises from
a tertiary component orbiting the eclipsing pair.
Description:
New photometry of V407 Peg was performed on 14 nights from 2011
September 21 through December 27 in order to obtain multiband light
curves. The observations were conducted using a PIXIS: 2048B CCD
camera and a BVRC filter set attached to the 61 cm reflector at
Sobaeksan Optical Astronomy Observatory (SOAO) in Korea.
Objects:
-----------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
-----------------------------------------------------------------
23 36 55.37 +15 48 06.4 V* V407 Peg = BD+14 5016 (P=0.63688)
-----------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 65 1568 CCD photometric observations of V407 Peg
--------------------------------------------------------------------------------
See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
J/AJ/145/100 : Differential BVR light curves of EP And (Lee+, 2013)
J/AJ/144/149 : CCD photometry of TY Boo (Christopoulou+, 2012)
J/AJ/142/12 : WZ Cyg BVRI light curves (Lee+, 2011)
J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)
J/AJ/138/478 : AR Boo differential BVR photometry (Lee+, 2009)
J/ApJ/629/1055 : Evolution of close binary systems (Yakut+, 2005)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d HJD-B ? Heliocentric Julian Date of B observation
15- 21 F7.4 mag DBmag ? Differential Johnson B band magnitude
23- 35 F13.5 d HJD-V Heliocentric Julian Date of V observation
37- 43 F7.4 mag DVmag Differential Johnson V band magnitude
45- 57 F13.5 d HJD-R ? Heliocentric Julian Date of RC observation
59- 65 F7.4 mag DRmag ? Differential Cousins RC band magnitude
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 11-Sep-2014