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nbody4 - input parameter file for nbody4
*
*
* Definition of parameters, options & counters.
* ----------------------------------------------
*
*
* Input parameters
* ****************
*
* --------------------------------------------------------------------
***
* NBODY4:
*
* KSTART Control index (1: new run; >1: restart; 3, 4, 5: new params).
* TCOMP Maximum computing time in minutes (saved in CPU).
* GPID Number of boards (counting from 0).
***
* INPUT:
*
* N Total particle number (singles + binary c.m; < NMAX - 2).
* NFIX Output frequency of data save or binaries (#3 & 6).
* NCRIT Final particle number (alternative termination criterion).
* NRAND Random number sequence skip.
* NRUN Run identification index.
*
* ETA Time-step parameter for total force polynomial.
* DTADJ Time interval for parameter adjustment (N-body units).
* DELTAT Output time interval (N-body units).
* TCRIT Termination time (N-body units).
* QE Energy tolerance (restart if DE/E > 5*QE & KZ(2) > 1).
* RBAR Virial cluster radius in pc (set = 0 for isolated cluster).
* ZMBAR Mean mass in solar units for equal-mass case (1.0 used if
0).
*
* KZ(J) Non-zero options for alternative paths (see table).
*
* DTMIN Time-step criterion for regularization search.
* RMIN Distance criterion for regularization search.
* ETAU Regularized time-step parameter (6.28/ETAU steps/orbit).
* ECLOSE Binding energy per unit mass for hard binary (positive).
* GMIN Relative two-body perturbation for unperturbed motion.
* GMAX Secondary termination parameter for soft KS binaries.
***
* INPUT: if(kz(4).gt.0)
*
* DELTAS Output interval for binary search (in TCR; #4, suppressed).
* ORBITS Minimum periods for binary output (level 1).
* GPRINT Perturbation thresholds for binary output (9 levels).
***
* DATA:
*
* ALPHA Power-law index for initial mass function (used if KZ(20)<2)).
* BODY1 Maximum particle mass before scaling (KZ(20): solar mass).
* BODYN Minimum particle mass before scaling (also after scaling).
* NBIN0 Number of primordial binaries (can be -ve: see IMF).
* ZMET Metal abundance (range 0.03 - 0.0001).
* EPOCH0 Evolutionary epoch (in Myr).
* DTPLOT Plotting interval for HRDIAG (N-body units; >= DELTAT).
***
* SETUP: if(kz(5).eq.2)
*
* APO Separation of two Plummer models (SEMI = APO/(1 + ECC).
* ECC Eccentricity of two-body orbit (ECC < 0.999).
* N2 Membership of second Plummer model (N2 <= N).
* SCALE Second scale factor (>= 0.2 for limiting minimum size).
*
* if(kz(5).eq.3)
*
* APO Separation between the perturber and Sun.
* ECC Eccentricity of orbit (=1 for parabolic encounter).
* DMIN Minimum distance of approach (pericentre).
* SCALE Perturber mass scale factor (=1 for Msun).
*
* if(kz(5).eq.4)
*
* SEMI Initial semi-major axis (changes a bit on scaling).
* ECC Eccentricity (ECC > 1: NAME = 1 & 2 free-floating).
* M1 Mass of first member (in units of mean mass).
* M2 Mass of second member (rescaled total mass = 1).
***
* SCALE:
*
* Q Virial ratio (Q = 0.5 for equilibrium).
* VXROT XY-velocity scaling factor (> 0 for solid-body rotation).
* VZROT Z-velocity scaling factor (not used if VXROT = 0).
* RTIDE Unscaled tidal radius (#14 > 1; otherwise copied to RSPH2).
***
* SCALE: if(kz(24).gt.0)
*
* X(3),V(3) Position and velocity for initial subsystems (KZ(24)
lines).
***
* XTRNL0: if (kz(14).eq.2)
*
* GMG Point-mass galaxy (solar masses, linearized circular orbit).
* RG0 Central distance (in kpc).
*
* if (kz(14).eq.3)
* GMG Point-mass galaxy (solar masses).
* DISK Mass of Miyamoto disk (solar masses).
* A Softening length in Miyamoto potential (in kpc).
* B Vertical softening length (kpc).
* VCIRC Galactic circular velocity (km/sec) at RCIRC (=0: no halo).
* RCIRC Central distance for VCIRC with logarithmic potential (kpc).
* RG Initial position; GMG+DISK=0, VG(3)=0: A(1+E)=RG(1), E=RG(2).
* VG Initial cluster velocity vector (km/sec).
*
***
* HOTSYS: if(kz(29).gt.0)
*
* SIGMA0 Hot initial velocity in km/sec (routine HOTSYS; #29).
***
* BINPOP: if(kz(8).eq.1.or.kz(8).gt.2)
*
* SEMI Semi-major axis in model units (all equal if RANGE = 0).
* ECC Initial eccentricity (< 0 for thermal distribution).
* RATIO Mass ratio M1/(M1 + M2); (= 1.0: M1 = M2 = <M>).
* RANGE Range in SEMI for uniform logarithmic distribution (> 0).
* NSKIP Binary frequency of mass spectrum (#20 < 2; body #1 first).
* IDORM Indicator for dormant binaries (>0: merged components).
* ICIRC Indicator for eigen-evolution (RANGE: minimum period).
* (see BINPOP for further explanation of SEMI, RATIO & RANGE uses)
*
***
* HIPOP: if(kz(8).gt.0.and.kz(18).gt.1)
*
* NHI Number of primordial hierarchies.
* SEMI Semi-major axis in model units (all equal if RANGE = 0).
* ECC Initial eccentricity (< 0 for thermal distribution).
* RATIO Mass ratio (= 1.0: M1 = M2; random in [0.5-0.9]).
* RANGE Range in SEMI for uniform logarithmic distribution (> 0).
* ICIRC Circularization & collision check (not implemented yet).
***
* INTIDE: if(kz(27).gt.0)
*
* RSTAR Size of typical star in S.U.
* IMS # idealized main-sequence stars.
* IEV # idealized evolved stars.
* RMS Scale factor for main-sequence radii (>0: fudge factor).
* REV Scale factor for evolved radii (initial size RSTAR).
***
* CLOUD0: if(kz(12).lt.0)
*
* NCL Number of interstellar clouds.
* RB Boundary radius in pc.
* VCL Mean cloud velocity in km/sec.
* SIGMA Velocity dispersion (#12 = -2 or -3: Gaussian).
* DTBIG Interval for injecting massive cloud (#12 = -2).
*
* CLM Cloud mass in solar units (#12 < 0; NCL members).
* RCL Cloud radius (softening) in pc.
***
* ---------------------------------------------------------------------
*
*
* Options KZ(J)
* *************
*
* ---------------------------------------------------------------------
* 1 COMMON save on unit 1 at end of run (=2: every 100*NMAX steps).
* 2 COMMON save on unit 2 at output (=1); restart if DE/E > 5*QE
(=2).
* 3 Basic data on unit 3 at output (freq. NFIX; >1: cluster + tail).
* # 4 Binary diagnostics on unit 4 (# threshold levels = KZ(4) < 10).
* 5 Initial conditions (#22 =0; =0: uniform & isotropic sphere;
* =1: Plummer; =2: two Plummer models in orbit, extra input;
* =3: massive perturber and planetesimal disk, extra input).
* =4: massive initial binary, extra input; output on unit
35).
* 6 Output of significant & regularized binaries (=1, 2, 3 & 4).
* 7 Lagrangian radii (>0: RSCALE; =2, 3, 4: output units 6, 7, 12;
* >=5: density & rms velocity at given radii on unit 26 & 27;
* >=5: average mass at given radii on unit 36 every DELTAT;
* =6: Lagrangian radii for two mass groups on unit 31 &
32.
* 8 Primordial binaries (=1 & >=3; >0: BINOUT; >2: BINDAT; >3: HIDAT).
* 9 Individual bodies printed at output time (MIN(5**KZ9,NTOT)).
* 10 Diagnostic KS output (>0: begin; >1: end; >=3: each step).
* # 11 Synchronization of circular orbits (suppressed).
* 12 Disk shocks (=1: standard model) or interstellar clouds (< 0).
* 13 Scaling of time (1: variable by t_cr; 2: variable by t_r;
* -1: constant scaling to t_r; -2: constant scaling to t_c).
* 14 External force (=1: linearized; -1: cutoff; =2: point-mass galaxy;
* =3: point-mass + disk + logarithmic halo in any combination).
* 15 Triple, quad, chain (#30 > 0) or merger search (>1: full output).
* 16 Updating of regularization parameters (RMIN, DTMIN & ECLOSE).
* 17 Modification of ETA (>=1) & ETAU (>1) by tolerance QE.
* 18 Hierarchical systems (=1: diagnostics; =2: primordial; =3: both).
* 19 Stellar evolution and mass loss (=1: old supernova scheme;
* =3: Eggleton, Tout & Hurley; >4: Chernoff--Weinberg).
* 20 Initial mass function (=0,1: Salpeter; >1: various, see IMF).
* 21 Extra output (>0: model, etc; >1: CENTRE; >2: MTRACE; >3: GLOBAL).
* 22 Initial conditions on unit 10 (=1: output; =2,3(unscaled): input).
* 23 Escaper removal (>1: diagnostics in file ESC; =2: angles unit
#6;
* >1: tidal tails output if #14 = 3).
* 24 Initial conditions for subsystem (routine SCALE; KZ(24) = #).
* # 25 Partial reflection of KS binary orbit (GAMMA < GMIN; suppressed).
* 25 HR diagnostics of evolving stars (output of B & S on #82 & 83).
* 26 Slow-down of two-body motion (=1: KS binary; =2: chain binary).
* 27 Two-body interactions (-2: RADIUS = 0; -1: collision detection;
* =1: sequential circ; > 0: collision).
* 28 (not used).
* # 29 Boundary reflection for hot system (suppressed).
* 30 Chain regularization (=1: basic; >1: main output; >2: each step).
* 31 Centre of mass correction after energy check.
* 32 Increase of output intervals (based on single particle energy).
* 33 Block-step diagnostics at main output (=2: active pipes).
* # 34 Roche lobe overflow (suppressed).
* 35 Time offset (global time from TTOT = TIME + DTOFF; offset =
100).
* 36 Step reduction for hierarchical systems (not recommended).
* 37 Step reduction for encounters with high-velocity particles.
* # 38 Multiple use of GRAPE-6 (sleep 1 sec after each timer check).
* 39 Neighbour list (=-1: on host; =0: full list or closest on GRAPE).
* 40 (not used).
* ---------------------------------------------------------------------
* # currently suppressed
* ---------------------------------------------------------------------
*
*
* Output counters
* ***************
*
* ---------------------------------------------------------------------
* NBCALL Neighbour lists (# NBLIST calls).
* NBESC Escaped binaries (#23).
* NBLOCK Block integration steps.
* NBKICK Binary neutron star kicks (#19).
* NBPREV Indicator for enforcing new KS scheduling (SUBINT).
* NBREF Boundary reflections (#29; suppressed).
* NBSTAT Diagnostic data on binary interactions (#4; inactive).
* NCBLK1 Active binary steps on HARP.
* NCBLK2 Active binary steps with more than one pipe.
* NCHAIN Chain regularizations (#30).
* NCOLL Stellar collisions (#27).
* NDIAG Diagnostic warning counter (BRAKE, IMPACT & SPIRAL).
* NDISS Tidal dissipation at pericentre (#27).
* NDUMP Restart counter (STOP after two restarts).
* NHIVEL High-velocity search for all particles (#37).
* NHLIST Neighbour lists on HARP (not implemented).
* NIRECT Initialization of NSTEPI after exceeding 2*10**9.
* NKICK Neutron star kicks (#19).
* NKSHYP Hyperbolic KS regularizations.
* NKSMOD Slow KS motion restarts (#26).
* NKSPER Unperturbed KS binary orbits.
* NKSREF Partial reflections of KS binary (#25; suppressed).
* NKSREG Total KS regularizations.
* NKSTRY Two-body regularization attempts.
* NMERG Mergers of stable triples or quadruples (#15).
* NMESC Escaped mergers (#15 and 23).
* NMTRY Attempted mergers.
* NPRECT Initialization of NKSPER after exceeding 2*10**9.
* NPRINT Output counter (data bank written at NFIX, then reset).
* NQUAD Four-body regularizations (#15).
* NSESC Escaped single particles (#23).
* NSHOCK Tidal shocks (#12).
* NSHORT Shortened time-step due to high-velocity particles (#37).
* NSPERT Membership of perturber list (set in routine SIEVE).
* NSTEPC Chain regularization steps (# DIFSY calls).
* NSTEPI Irregular integration steps (reset to zero at 2*10**9).
* NSTEPQ Quadruple regularization integration steps (#15).
* NSTEPS Total number of time-steps (reset to zero at 2*10**9).
* NSTEPT Triple regularization integration steps (#15).
* NSTEPU Regularized integration steps.
* NSYNC Number of synchronous binaries (e < 0.002; #27).
* NTIDE Tidal captures from hyperbolic orbits (#27).
* NTIMER Time-step counter (reset to zero on checking CPU time).
* NTPERT Perturbation time-scale evaluations (includes NBLIST calls).
* NTRECT Time rectifications (not implemented yet).
* NTRIP Three-body regularizations (#15).
* NTTRY Search for triple, quad & chain regularization or mergers.
* NURECT Initialization of NSTEPU after exceeding 2*10**9.
* NWARN Warning messages (only first 1000 printed).
* ---------------------------------------------------------------------
*
* Counters in COMMON/STAR/
* ************************
*
* ---------------------------------------------------------------------
* NMDOT Calls to routine MDOT.
* NMS Main sequence stars (type 0/1).
* NHG Hertzsprung gap (type 2).
* NRG Red giants (type 3).
* NHE Helium burning (type 4).
* NRS red supergiants (type 5).
* NWD White dwarfs (type 8).
* NSN Neutron stars (type 9).
* NHI High-velocity stars (r < 3*<R>).
* NDD Doubly generate binaries (type >= 8).
* NBS Blue stragglers (type 1).
* NTZ Thorne-Zytkow objects (type 9 + 0/1 -> 9).
* NAS Accretion-induced supernovae (Roche; M2 > MCH; type 12).
* NBH Black holes (type 10).
* NGB Gamma-ray bursters.
* NROCHE Calls to routine ROCHE.
* NRO Completed Roche stages.
* NBR Blue Roche (TM < TPHYS & type 0/1).
* NBRK Calls to routine BRAKE (GR & MB).
* NCONT Contact binaries (Roche; enforced collisions).
* NCOAL Coalescence of binaries (Roche; giant collisions).
* NHYP Hyperbolic collisions & coalescence.
* NSPIR Calls to routine SPIRAL.
* NSP Circularization events.
* NCIRC Successful circularizations.
* NSLP Inactive circularizations (TC > 2x10**9 yr).
* NEWHI New hierarchical systems (counted by routine HIARCH).
* NEINT Runge-Kutta integration steps for eccentricity modulation.
* NGLOB0 Initial membership of globular cluster model.
* NGLOB Current membership.
* NSHOCK Tidal shocks.
* ---------------------------------------------------------------------
*
*
* Stellar evolution types
* ***********************
*
* ---------------------------------------------------------------------
* 0 Low main sequence (M < 0.7).
* 1 Main sequence.
* 2 Hertzsprung gap (HG).
* 3 Red giant.
* 4 Core Helium burning.
* 5 First AGB.
* 6 Second AGB.
* 7 Helium main sequence.
* 8 Helium HG.
* 9 Helium GB.
* 10 Helium white dwarf.
* 11 Carbon-Oxygen white dwarf.
* 12 Oxygen-Neon white dwarf.
* 13 Neutron star.
* 14 Black hole.
* 15 Massless supernova remnant.
* ---------------------------------------------------------------------
Sverre Aarseth
runbody4(1NEMO)
define.f - dummy, but is the actual text in the DESCRIPTION part of this
man page!
1-mar-06 documented PJT
13-mar-06 minor updates via Sverre PJT/SJA
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