Bibcode
García-Segura, G.; Villaver, E.; Manchado, A.; Langer, N.; Yoon, S.-C.
Bibliographical reference
The Astrophysical Journal, Volume 823, Issue 2, article id. 142, pp. (2016).
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6
2016
Journal
Citations
20
Refereed citations
19
Description
We present new binary stellar evolution models that include the effects
of tidal forces, rotation, and magnetic torques with the goal of testing
planetary nebulae (PNs) shaping via binary interaction. We explore
whether tidal interaction with a companion can spin-up the asymptotic
giant brach (AGB) envelope. To do so, we have selected binary systems
with main-sequence masses of 2.5 M ⊙ and 0.8 M
⊙ and evolve them allowing initial separations of 5, 6,
7, and 8 au. The binary stellar evolution models have been computed all
the way to the PNs formation phase or until Roche lobe overflow (RLOF)
is reached, whatever happens first. We show that with initial
separations of 7 and 8 au, the binary avoids entering into RLOF, and the
AGB star reaches moderate rotational velocities at the surface (∼3.5
and ∼2 km s‑1, respectively) during the inter-pulse
phases, but after the thermal pulses it drops to a final rotational
velocity of only ∼0.03 km s‑1. For the closest
binary separations explored, 5 and 6 au, the AGB star reaches rotational
velocities of ∼6 and ∼4 km s‑1, respectively,
when the RLOF is initiated. We conclude that the detached binary models
that avoid entering the RLOF phase during the AGB will not shape bipolar
PNs, since the acquired angular momentum is lost via the wind during the
last two thermal pulses. This study rules out tidal spin-up in
non-contact binaries as a sufficient condition to form bipolar PNs.