SIMBAD references

2006MNRAS.373..733S - Mon. Not. R. Astron. Soc., 373, 733-738 (2006/December-1)

Violent stellar merger model for transient events.

SOKER N. and TYLENDA R.

Abstract (from CDS):

We derive the constraints on the mass ratio for a binary system to merge in a violent process. We find that the secondary-to-primary stellar mass ratio should be 0.003 ≲ (M2/M1) ≲ 0.15. A more massive secondary star will keep the primary stellar envelope in synchronized rotation with the orbital motion until merger occurs. This implies a very small relative velocity between the secondary star and the primary stellar envelope at the moment of merger, and therefore very weak shock waves, and low-flash luminosity. A too low-mass secondary will release small amount of energy, and will expel small amount of mass, which is unable to form an inflated envelope. It can, however, produce a quite luminous but short flash when colliding with a low-mass main-sequence star.

Violent and luminous mergers, which we term mergebursts, can be observed as V838 Monocerotis-type events, where a star undergoes a fast brightening lasting days to months, with a peak luminosity of up to ∼106Lfollowed by a slow decline at very low effective temperatures.


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stars: individual: V838 Mon - stars: individual: V4332 Sgr - stars: individual: M31 RV - stars: mass-loss - stars: pre-main-sequence - supergiants

Simbad objects: 3

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2020.09.21-06:09:13

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