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Analysis of the W UMatype Binary V752 Centauri
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Title: Analysis of the W UMatype Binary V752 Centauri
1
Analysis of the W UMa-type Binary V752 Centauri
- Hana Schumacher
- Supervisor Dr. Michael Albrow
- Co-Supervisor Prof. John Hearnshaw
- University of Canterbury
2
Introduction
- V752 Cen
- Motivation for research
- Observations
- Configuration
- Conclusion
3
V752 Centauri
- W UMa-type, SB2 binary
- 9.33 Visual Magnitude
- Spectral type F8V
- Period 0d.370248
- Variability discovered in 1970
- Observed photometrically and spectroscopically by
Sisterò and Castore de Sisterò in the 1970s.
4
Motivation
- Sisterò and Castore de Sisteròs observations
have been analysed 3 times, yielding different
solutions each time - To provide a modern set of observations, both
photometric and spectroscopic
5
Observations
- Mt John University Observatory, Lake Tekapo, New
Zealand - Photometric observations using 0.6m O.C.
telescope and S-big ST 9 CCD in Johnsons BVRI - Spectroscopic observations using 1m McLellan
telescope with High Efficiency and Resolution
Canterbury University Large Echelle Spectrograph
HERCULES
6
Photometry
- Reduced using MIRA AL
- Light curves typical of W type W UMa binary
- Display of the OConnell effect
7
Spectroscopy
- High resolution spectroscopy uncovered previously
undetected feature in spectrum - Broad and narrow lined spectra separated using a
Fourier filtering process written by Dr Michael
Albrow
8
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9
Spectroscopy
- Spectra cross-correlated against synthetic
template - Synthetic templates of F and G spectral types
- spectral types of contact binary narrow lined
component - Radial velocities measured by fitting Gaussian
profile
10
W UMa-type Binary
- ? velocity from 1972 observations of V752 Cen
- ?29.15 kms-1 (Barone et al. (1993)
- 2007 observations
- ?-13.84.8 kms-1
11
Narrow lined feature third component?
- Measured and fitted velocity curve
- P 5d.147
- ? -7.3 0.1kms-1
- K 43.4 0.2kms-1
12
Configuration of system
- SB2 and SB1 orbiting about common centre of mass
13
Conclusion
- Systematic velocity shift over 30 years supports
quadruple configuration theory - Period of total system unknown
- V752 Cen triple lined quadruple system
14
Acknowledgements
- Dr Michael Albrow
- Prof. John Hearnshaw
- PRCSA 2008 conference organisers
- Royal Society of New Zealand, Canterbury Branch
- Dennis William Moore Fund, University of
Canterbury
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