[Mesa-users] Accounting for baryonic to gravitational mass conversion

Gianluca Pagliaro gianluca.pagliaro at aei.mpg.de
Wed Jul 9 17:08:39 UTC 2025


Good evening,
in the context of a neutron star (point mass) accreting mass from a donor star, I would like to implement the baryonic to gravitational mass conversion for the neutron star.
 
I came across the ' use_radiation_corrected_transfer_rate ' flag, and I believe it's the best way to implement it. In the docs I read it works as follows:
     delta_mass = (1-eta) * mass_transfer_rate * dt
 
where I believe eta the standard accretion efficiency: eta = 1 - alpha - beta - delta , as described in the MESA documentation.
 
In the simplistic assumption of a constant 15% baryonic mass being converted in gravitational binding energy, I would need to multiply the above equation by 0.85.
I see there's no hook for this function, so I wonder how can I do it.
 
Thank you,
Gianluca.
 
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