2014ApJ...786...39N


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET18:25:11

2014ApJ...786...39N - Astrophys. J., 786, 39 (2014/May-1)

V1309 Sco–Understanding a merger.

NANDEZ J.L.A., IVANOVA N. and LOMBARDI J.C.Jr

Abstract (from CDS):

One of the two outcomes of a common envelope (CE) event is a merger of the two stars. To date, the best known case of a binary merger is the V1309 Sco outburst, where the orbital period was known and observed to decay up to the outburst. Using the hydrodynamical code StarSmasher, we study in detail which characteristics of the progenitor binary affect the outburst and produce the best match with observations. We have developed a set of tools in order to quantify any CE event. We consider binaries consisting of a 1.52 M giant and a 0.16 Mcompanion with Porb∼ 1.4 days, varying the nature of the companion and its synchronization. We show that all considered progenitor binaries evolve toward the merger primarily because of Darwin instability. The merger is accompanied by mass ejection that proceeds in several separate mass outbursts and takes away a few percent of the donor mass. This very small mass, nonetheless, is important as it is not only sufficient to explain the observed light curve, but it also carries away up to one-third of both the initial total angular momentum and initial orbital energy. We find that all synchronized systems experience L2 mass loss that operates during just a few days prior to the merger and produces ring-shaped ejecta. The formed star is always a strongly heated radiative star that differentially rotates. We conclude that the case of a synchronized binary with a main-sequence companion gives the best match with observations of V1309 Sco.

Abstract Copyright:

Journal keyword(s): binaries: close - hydrodynamics - stars: individual: V1309 Sco - stars: kinematics and dynamics - stars: rotation

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME M31 RV No* 00 43 02.433 +41 12 56.17           M0 104 0
2 NAME NGC 300 OT2008-1 ev 00 54 34.16 -37 38 28.6           ~ 110 1
3 V* V838 Mon CV* 07 04 04.8222936785 -03 50 50.637499515   15.5   15.18 14.51 M10+B3V 379 0
4 NAME M85 OT2006-1 No* 12 25 23.82 +18 10 56.2     19.30     ~ 58 1
5 V* V1309 Sco CV* 17 57 32.9383021931 -30 43 09.967391199   16.9   14.8   ~ 188 0
6 V* V4332 Sgr CV* 18 50 36.6959119600 -21 23 28.927014456         14.37 K8/M0e 148 0
7 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 215 1

    Equat.    Gal    SGal    Ecl

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2021.03.05-18:25:12

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