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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 order; they may be given in
any order if the keyword is also given. Use --help to confirm this man page
is up to date.
- 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.
In
a multi-time snapshot series when stars around unbound, some programs only
allocate space for a snapshot in the beginning, thus if there are snapshots
with more particles than in the first one, the program may crash.
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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