The Algol binary system KZ Pavonis revisited

Details The Algol binary system KZ Pavonis revisited The Algol binary system KZ Pavonis revisited

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.407..497s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 407, Issue 1, pp. 497-506.

Astronomy and Astrophysics

Astronomy

Techniques: Photometric, Techniques: Spectroscopic, Stars: Binaries: Eclipsing, Stars: Fundamental Parameters, Stars: Individual: Kz Pav

Scientific paper

We 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 a1 sin i = 0.0103 +/- 0.0001au, a2 sin i = 0.0158 +/- 0.0001 au, M1 sin3i = 1.598 +/- 0.006 Msolar and M2 sin3i = 1.045 +/- 0.006 Msolar. The close binary components rotated synchronously according to their MgI (5183.6 Å) 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: M1 = 1.70 +/- 0.02 Msolar, M2 = 1.09 +/- 0.03 Msolar, R1 = 1.74 +/- 0.01 Rsolar, R2 = 1.94 +/- 0.02 Rsolar, L1 = 5.86 +/- 0.81 Lsolar and L2 = 2.32 +/- 0.40 Lsolar. 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.

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