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Issue A&A
Volume 376, Number 1, September II 2001
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20011024



A&A 376, L9-L12 (2001)
DOI: 10.1051/0004-6361:20011024

Is KPD 1930+2752 a good candidate type Ia supernova progenitor?

E. Ergma1, 2, A. V. Fedorova3 and L. R. Yungelson3, 4

1  Physics Department, Tartu University, Ülikooli 18, 50090 Tartu, Estonia
2  Observatory, PO Box 14, 00014, University of Helsinki, Finland
3  Institute of Astronomy, 48 Pyatnitskaya Str., 109017 Moscow, Russia
    e-mail: afed, lry@inasan.rssi.ru
4  Astronomical Institute "Anton Pannekoek" , Kruislaan 403, 1098 SJ Amsterdam, The Netherlands

(Received 14 May 2001 / Accepted 16 July 2001 )

Abstract
We investigate the evolution of a binary system which initially has an orbital period of 2h17m and contains a 0.5 $M_{\odot}$ helium star with a white dwarf companion of 0.97 $M_{\odot}$, similar to the suggested SN Ia candidate progenitor KPD 1930+2752. We show that the helium star completes core helium burning and becomes a white dwarf before the components merge. The most probable outcome of the merger of the components is the formation of a massive white dwarf, despite the fact that initially the total mass of the system is above the Chandrasekhar mass.


Key words: stars: evolution -- stars: KPD 1930+2752 -- stars: SNe Ia -- binaries: evolution

Offprint request: E. Ergma, ene@physic.ut.ee

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