J/AJ/145/39 Differential BV(RI)c light curves of PY Vir (Zhu+, 2013)
Photometric study of the possible cool quadruple system PY Virginis.
Zhu L.Y., Qian S.B., Liu N.P., Liu L., Jiang L.Q.
<Astron. J., 145, 39 (2013)>
=2013AJ....145...39Z 2013AJ....145...39Z
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: evolution -
stars: individual: PY Vir
Abstract:
Complete CCD photometric light curves in BV(RI)c bands obtained in
2012 for the short-period close binary system PY Virginis are
presented. A new photometric analysis with the Wilson-Van Hamme code
shows that PY Vir is an A-type marginal contact binary system. The
absolute parameters of PY Vir are derived using spectroscopic and
photometric solutions. Combining new determined times of minimum light
with others published in the literature, the O-C diagram of the binary
star is investigated. A periodic variation, with a period of
5.22(±0.05)years and an amplitude of 0.0075(±0.0004)days, was
discovered. Since the spectrum of a third component has been detected
by Rucinski et al. (2008, cat. J/AJ/136/586), we consider this cyclic
period oscillation to be the result of the light-time effect due to
the presence of a third body. This third component may also be a
binary itself. Therefore, PY Vir should be a quadruple system composed
of two cool-type binary systems. This system is a good astrophysical
laboratory to study the formation and evolution of close binaries and
multiple systems.
Description:
We carried out new photometric observations of PY Vir, which was
observed on 2012 January 7, 29, 31, and April 23 with DW436 2048*2048
CCD attached to the 60cm Cassegrain reflecting telescope of Yunnan
Astronomical Observatory of Chinese Academy of Sciences (YNAO). Its
field of view at the Cassegrain focus is about 12*12arcmin2.
Objects:
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RA (2000) DE Designation(s) (Period)
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13 10 32.22 -04 09 32.6 PY Virginis = ASAS J131032-0409.5 (P=0.31124849)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 23 736 BV(RI)c-band CCD observations of PY Vir
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)
J/AN/334/860 : Catalogue of eclipsing variables. Ver. 2 (Avvakumova+, 2013)
J/MNRAS/412/1787 : Physical parameters of 62 eclipsing binaries (Deb+, 2011)
J/AJ/136/586 : Radial velocities of 10 close binaries (Rucinski+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- Band [BVRI] Band (B, V, Rc, or Ic)
3- 16 F14.6 d HJD Heliocentric Julian Date of observation
18- 23 F6.3 mag dmag Differential magnitude in Band
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 11-Mar-2014