[mesa-users] Mass-transfer in MESA

Anastasios Fragkos Anastasios.Fragkos at unige.ch
Fri Sep 30 11:04:54 EDT 2016

Dear Hannah,

You need to look into the parameters below on the binary_controls:
mass_transfer_* ¶<http://mesa.sourceforge.net/binary_controls_defaults.html#mass_transfer_>

Transfer efficiency controls. alpha, beta, delta and gamma parameters as described in Tauris & van den Heuvel 2006 section 16.4.1, transfer efficiency is given by 1-alpha-beta-delta.

These only affect mass that is lost from the donor due to mass transfer, winds from each star will carry away angular momentum from the vicinity of each even when transfer efficiency is unity. Each of these represent the following:

  *   alpha : fraction of mass lost from the vicinity of the donor as fast wind
  *   beta : fraction of mass lost from the vicinity of the accretor as fast wind
  *   delta : fraction of mass lost from circumbinary coplanar toroid
  *   gamma : radius of the circumbinary coplanar toroid is gamma**2 * orbital_separation

mass_transfer_alpha = 0.0d0
mass_transfer_beta = 0.0d0
mass_transfer_delta = 0.0d0
mass_transfer_gamma = 0.0d0


On 30 Sep 2016, at 13:56, Hannah Brinkman <brinkmanhe at gmail.com<mailto:brinkmanhe at gmail.com>> wrote:

Dear all,

for my master thesis, I am working with MESA to evolve binary systems. Currently, I am trying to change the mass-transfer between my stars from the non-conservative case to a conservative, or partially conservative case. By switching off the Eddington limit on the accretion, the mass-transfer becomes conservative. However, I'd like to be able to transfer a certain percentage of the mass from the primary star to the secondary star. Is this possible?
I have attached my inlist-files just in case they might be needed. The ones attached give non-conservative mass-transfer.
I hope someone can help me with this.

With kind regards,

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