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The Subdwarf Eclipsing Binary LB3459 (AA Dor)

Published online by Cambridge University Press:  12 April 2016

R.W. Hilditch ,
Graham Hill  and
D. Kilkenny
R.W. Hilditch
Affiliation:
University Observatory, St Andrews, Scotland
Graham Hill
Affiliation:
Dominion Astrophysical Observatory, Victoria, Canada
D. Kilkenny
Affiliation:
South African Astronomical Observatory, Cape Town, South Africa

Extract

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A review was presented of the currently available observational data on this evolved system, namely, uvby photometry (Kilkenny et al. 1978; paper II) radial velocities (Kilkenny et al. 1981; paper III) and a non-LTE atmosphere analysis of the primary component (Kudritski et al. 1981). Kudritski et al. conclude that T(pr) = 40000 ± 2500°K and log g = 5.3 ± 0.2 and from the spectroscopic data and light curve analysis (papers II, III) derive masses and radii for the primary and secondary components of M(pr) ≃ 0.25 M⊙, M(sec) ≃ 0.04 M⊙, R(pr) ≃ 0.16R⊙, R(sec) ≃ 0.09R⊙ respectively. Thus the primary component is a normal sd0 star whilst the secondary component is a most enigmatic object, perhaps a normal composition degenerate dwarf but of too low a mass to be on the main sequence, perhaps an evolved degenerate object but then the radius is too large. The published evolutionary models for this system (Paczynski 1980; Conti et al 1981) do not adequately describe its current status.

Type
Part IV: Cataclysmic Binaries and their Role in Stellar Evolution
Information
International Astronomical Union Colloquium , Volume 69: Binary and Multiple Stars as Tracers of Stellar Evolution , 1982 , pp. 455 - 456
Copyright
Copyright © Reidel 1982

References

Conti, P.S., Dearborn, D. & Massey, P. 1981. Mon.Not. R. Astr. Soc. 195, 165 Google Scholar
Hill, G. 1979, Publ.Dom.Astrophys. Obs. 15, 297.Google Scholar
Kilkenny, D., Penfold, J.E. & Hilditch, R.W., 1978. Mon. Not. R. Astr. Soc. 187, 1.Google Scholar
Kilkenny, D., Hill, P.W. & Penfold, J.E., 1981. Mon. Not. R. Astr. Soc. 194,429 Google Scholar
Kudritski, R.P., Simon, K.P., Lynas-Gray, A.E., Kilkenny, D. & Hill, P.W. submitted to Astr.Astrophys.Google Scholar
Paczynski, B. 1980 Acta Astr. 30, 113.Google Scholar