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unbind - find unbound stars to a stellar system
unbind in=snapshot_in
out=snapshot_out [parameter=value]
unbind tries to find stars
that are unbound to a stellar system. It simply calculates the binding energy
(per unit mass) and flags the stars for which this is larger than a specified
cutoff energy (ecutoff) are flagged as ’escaped’. The program outputs the
stars which are either bound or unbind to the system.
The Key field (an
integer) in the snapshot(5NEMO)
data is also copied accordingly; when it
is not present it will be initialized to the order of particles present
in the input file, 0 being the first one, and nbody-1 the last one.
The
following parameters are recognized in any order if the keyword is also
given:
- in=in-file
- input file, in snapshot(5NEMO)
format. If potentials are
not present in the snapshot, an (expansive) exact N-squared energy calculation
is forced. [no default]
- out=out-file
- output file, in snapshot(5NEMO)
format,
containing the masses and phasespace coordinates of the (un)bound particles
[no default].
- exact=t|f
- Logical determining if you want force an exact N-squared
calculation, in case potentials were found to be present in the snapshot
[default: f].
- eps=value
- Softening parameter used in energy calculations
in case an exact N-squared energy calculation is done. [default: 0.025]
- ecutoff=value
- Cutoff of binding energy (per unit mass), above which the stars will be
removed from the snapshot [default: 0].
- bind=t|f
- Logical determining if
the bound (t) or unbound (f) stars should be written to file [default:
t, i.e. bound stars are written to file].
- map=t|f
- Logical determining if you
want a map displayed by star number of the stars bound and unbound to the
system. This is handy to compare maps of the same system under slightly
different conditions.
- times=
- Which times to process, by default all.
snapmask(1NEMO)
, skid(1TIPSY)
Peter Teuben
~/src/pjt/nbody unbind.c unbind.1
12-Nov-87 V1.0 created Peter Teuben
15-Nov-87 V1.2 cutoff and output added PJT
19-nov-87 V1.3 bind keyword added PJT
9-Mar-88 V1.4 memory allocation better PJT
xx-apr-88 V1.6 added map option PJT
6-jun-88 V1.7 new filestruct - keywords changed PJT
24-oct-88 V1.8 added Key copy PJT
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