[Mesa-users] Requesting help Regarding Conservation of Mass during Evolution of LMXB

Pulkit Ojha pulkit.ojha at niser.ac.in
Sun Oct 23 11:36:45 UTC 2022

Dear All,

I'm Pulkit and I'm trying to evolve LMXB containing a main sequence donor
star of mass 1 Msun and a point mass of 1.35 MSun (specified as NS
accretor) with an initial period of 1 - 1.5 days. While evolving binary
systems, I'm facing some problems related to conservation of total mass
during the evolution of LMXBs. Even if the mass transfer efficiency ( given
by f_{mt} = 1 - \alpha - \beta - \delta ) is 1 by setting all the three
parameters alpha, beta and delta to 0, the total mass of donor + NS is lost
by 21%, i.e.  about 1.855 Msun mass remains finally.

 It has also been mentioned on the mesa document
"*winds will carry specific angular momentum of stars even if the
efficiency is 1*". Since, alpha and beta are defined as "alpha = fraction
of the mass lost from the vicinity of the donor as fast winds" and
similarly beta for the accretor, they lead me to the question of* what are
the other kinds of winds which are not being controlled by these
parameters.  *

Hence, I would be really grateful if someone could help me understand the
reason for mass not remaining conserved while evolving LMXBs.  For your
reference, I'm attaching a zip file containing relevant inlist files.

Yours Truly

Pulkit Ojha
5th Year Integrated MSc.,
School of Physical Sciences,
National Institute of Science Education and Research
Bhubaneswar, INDIA
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