Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-03-17
MNRAS 296, L34, 1998
Astronomy and Astrophysics
Astrophysics
3 pages. 1 figure
Scientific paper
10.1046/j.1365-8711.1998.01651.x
The white dwarf stars WD1614+136 and WD1353+409 are not sufficiently massive to have formed through single star evolution. However, observations to date have not yet found any evidence for binarity. It has therefore been suggested that these stars are the result of a merger. In this paper we place an upper limit of approximately 50kms on the projected rotational velocities of both stars. This suggests that, if these stars are the results of a merger, efficient angular momentum loss with accompanying mass loss must have occurred. If the same process occurs following the merging of more massive white dwarf stars, the predicted rate of Type Ia supernovae due to merging white dwarfs may have been greatly over-estimated. Further observations to determine binarity in WD1614+136 and WD1353+409 are therefore encouraged.
Marsh Thomas R.
Maxted Pierre F. L.
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