[Mesa-users] mass transfer low and intermediate binary stars

[Evan Bauer]

Hi Seblu,

There was a change in a default setting between 9575 and 9793 that may be relevant for your models. In 9575 and older versions, “limit_retention_by_mdot_edd” was set to .true. by default. If no positive value is specified for “use_this_for_mdot_edd”, then this setting calculates the Eddington accretion rate by assuming that the accretor is a black hole. This is therefore NOT appropriate for cases where you are evolving both stars and the accretor is a star rather than black hole. To make sure users don’t accidentally leave this setting on when setting evolve_both_stars = .true., the default for “limit_retention_by_mdot_edd” was changed to .false. for version 9793 and later (including 10000). You can read more details in the documentation for these controls here: http://mesa.sourceforge.net/binary_controls_defaults.html#mass_transfer_controls <http://mesa.sourceforge.net/binary_controls_defaults.html#mass_transfer_controls>

If you still want to limit accretion by the Eddington rate, you will need to use the “use_this_for_mdot_edd” control to set a value that is appropriate for your accreting model.

Cheers,
Evan


> On Oct 21, 2017, at 10:49 PM, seblu humne via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> Dear all mesa users,
> 
> For mass transfer in low and intermediate mass binary stars systems in the range of 10^2-10^9, which mesa version suitabel for plotting mass transfer  in the 
> range of this astronomical time scale? When i was running mesa-r10000 from binary/set_suite/ i donot get a simulation (plot) for mass transfer in low and intermediate binary stars, since we have only evolve_both_stars (this is for massive stars). Through mesa-r10000 running how we can get the plot between donor and accereto stars,  implicit_mdot and for both?, it is strange to find the results b/n 10^2-10^9. However,
> mesa-r9575 and other version can do those stranges. So that please can you help me on which mesa version is suitable for mass transfer in between 0.01Msun-1.5Msun for donor and 0.1Msun-3.56Msun accretor stars (in low-and intermediate mass stars)?
> 
> Thanks in advance
> 
> Cheers,
> Seblu
> 
> 

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