The Algol binary system KZ Pavonis revisited

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dc.contributor.authorSurgit, D.
dc.contributor.authorErdem, A.
dc.contributor.authorBudding, E.
dc.date.accessioned2025-01-27T20:41:50Z
dc.date.available2025-01-27T20:41:50Z
dc.date.issued2010
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractWe present results from analysing new spectroscopic and photometric observations of the KZ Pav (IDS 20490-7048 A-BC) multiple system. High-resolution spectra were taken at the Mt John University Observatory in 2007 and 2008. Radial velocities for the close binary were determined from cross-correlation and spectral disentangling methods. The resulting orbital elements are a(1) sin i = 0.0103 +/- 0.0001 au, a(2) sin i = 0.0158 +/- 0.0001 au, M(1) sin3i = 1.598 +/- 0.006 M(circle dot) and M(2) sin3i = 1.045 +/- 0.006 M(circle dot). The close binary components rotated synchronously according to their Mg i (5183.6 A) line profiles. Four photometric data sets (1988-89 BV, 1998 V, Hipparcos and 2006 BVRI) were modelled with modern light-curve synthesis methods. The radial velocity models, including proximity effects, give the close binary mass ratio as 0.641 +/- 0.003. The combination of the photometric light and radial velocity data gives the following absolute parameters: M(1) = 1.70 +/- 0.02 M(circle dot), M(2) = 1.09 +/- 0.03 M(circle dot), R(1) = 1.74 +/- 0.01 R(circle dot), R(2) = 1.94 +/- 0.02 R(circle dot), L(1) = 5.86 +/- 0.81 L(circle dot) and L(2) = 2.32 +/- 0.40 L(circle dot). The distance to KZ Pav is 115 +/- 8 pc from our analysis, taking into account interstellar extinction. The orbital period of the close binary, from times of minimum data covering nearly one century, indicates a quasi-sinusoidal form superimposed on a downward parabola. The secular period decrease was interpreted in terms of the combined effects of mass transfer and loss. The sinusoidal component may reflect a light-time effect from either an unseen component or higher order terms in perturbations from the BC system, or perhaps an internal magnetic field rearrangement (Applegate type) mechanism. The orbits of the A-BC and B-C systems are considered against historic astrometric measurements.
dc.description.sponsorshipTUBITAK (Scientific and Technological Research Council of Turkey) [108T714]; Canakkale Onsekiz Mart University Research Foundation [2007/55]
dc.description.sponsorshipThis study is related to the Southern Binaries Project of the Astrophysics Research Centre at Canakkale Onsekiz Mart University, the Carter National Observatory and the MJUO in New Zealand. It also forms part of the PhD thesis of DS and was supported in part by TUBITAK (Scientific and Technological Research Council of Turkey) under Grant No. 108T714 and by Canakkale Onsekiz Mart University Research Foundation under Grant No. 2007/55. DS thanks Dr Faruk Soydugan for his useful comments and suggestions. We thank Professor John Hearnshaw for granting use of the observing facilities at MJUO. We also thank the anonymous referee for comments which helped us to improve the quality of this paper.
dc.identifier.doi10.1111/j.1365-2966.2010.16919.x
dc.identifier.endpage506
dc.identifier.issn0035-8711
dc.identifier.issue1
dc.identifier.scopus2-s2.0-77956406987
dc.identifier.scopusqualityQ1
dc.identifier.startpage497
dc.identifier.urihttps://doi.org/10.1111/j.1365-2966.2010.16919.x
dc.identifier.urihttps://hdl.handle.net/20.500.12428/24247
dc.identifier.volume407
dc.identifier.wosWOS:000281140900041
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWiley-Blackwell
dc.relation.ispartofMonthly Notices of The Royal Astronomical Society
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjecttechniques: photometric
dc.subjecttechniques: spectroscopic
dc.subjectstars: binaries: eclipsing
dc.subjectstars: fundamental parameters
dc.subjectstars: individual: KZ Pav
dc.titleThe Algol binary system KZ Pavonis revisited
dc.typeArticle

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