2020A&A...640A..16T


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET13:36:45

2020A&A...640A..16T - Astronomy and Astrophysics, volume 640A, 16-16 (2020/8-1)

The evolution of stellar triples. The most common evolutionary pathways.

TOONEN S., PORTEGIES ZWART S., HAMERS A.S. and BANDOPADHYAY D.

Abstract (from CDS):


Context. Many stars do not live alone, but instead have one or more stellar companions. Observations show that these binaries, triples, and higher-order multiples are common. While the evolution of single stars and binaries have been studied extensively, the same is not true for the evolution of stellar triples.
Aims. To fill in this gap in our general understanding of stellar lives, we aim to systematically explore the long-term evolution of triples and to map out the most common evolutionary pathways that triples go through. We quantitatively study how triples evolve, which processes are the most relevant, and how this differs from binary evoluion.
Methods. We simulated the evolution of several large populations of triples with a population synthesis approach. We made use of the triple evolution code TRES to simulate the evolution of each triple in a consistent way, including three-body dynamics (based on the secular approach), stellar evolution, and their mutual influences. We simulated the evolution of the system up until mass transfer starts, the system becomes dynamically unstable, or a Hubble time has passed.
Results. We find that stellar interactions are common in triples. Compared to a binary population, we find that the fraction of systems that can undergo mass transfer is ∼2-3 times larger in triples. Moreover, while orbits typically reach circularisation before Roche-lobe overflow in binaries, this is no longer true in triples. In our simulations, about 40% of systems retain an eccentric orbit. Additionally, we discuss various channels of triple evolution in detail, such as those where the secondary or the tertiary is the first star to initiate a mass transfer event.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: evolution - binaries: close - binaries: general

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * bet Per Al* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1153 2
2 * omi02 Eri Er* 04 15 16.3197260 -07 39 10.338087 5.69 5.25 4.43 3.74 3.29 K0V 745 0
3 * omi02 Eri B WD* 04 15 21.786 -07 39 29.22 9.147 9.83 9.53     DA2.9 319 0
4 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2221 0
5 HD 97131 SB* 11 10 34.2453011421 -30 27 18.613282540   9.17 8.80     F2V 25 1
6 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 986 0
7 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 831 0
8 HD 196795 BY* 20 39 37.70965 +04 58 19.3401 10.218 9.084 7.842 7.065 6.382 K5V 157 0
9 * zet Aqr ** 22 28 49.90685 -00 01 11.7942   4.06 3.65     F3III-IV 127 0
10 LAWD 94 WD* 23 54 01.0724791071 -33 16 31.077867970   14.6 13.56     DA5.7 48 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-13:36:45

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