home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Starbase One Astronomy & Space Collection
/
STARBASE_ONE.ISO
/
a96
/
disk07
/
starclok.exe
/
SCLOCK10.DOC
next >
Wrap
Text File
|
1995-10-29
|
3KB
|
64 lines
Short Guide to StarClock 1.0
----------------------------
Introduction
Based on grid of stellar models computed recently at Geneva Observatory by
G. Schaller et al. (Astron. Astrophys. Suppl. Ser. 96, 269, 1992),
StarClock 1.0 is a freeware program for PC/DOS machines (VGA required)
which animates evolution of stars (0.8 to 25 solar masses, solar
metallicity) in the Hertzsprung-Russell diagram, more exactly in the
log(L/L_solar) vs. log(T_eff) plane.
The executable version of the program (binary file sclock10.exe, about 100
kbytes) can be downloaded from the anonymous ftp 147.229.32.10
(psycho.fme.vutbr.cz), cd astronomy/APO. There is also sclock10.doc (this
file) in the same directory. The original grid is available through the WWW
page http://obswww.unige.ch/~schaerer/evol/Evol_grids.html.
Description
Press any key to get into the first (and the only, in the current version)
worksheet.
Use Arrows or Tab key to navigate between the fields. On the left you find
column of fields for individual masses -- press Enter to toggle between the
state when the star of the particular mass is plotted in the diagram and
the state when it isn't. Use Start, End and Step fields to enter start
time, end time (both in My, i.e. millions of years), and increment (in ky,
i.e. thousands of years), respectively. Note that only integer values up to
about 32,000 are allowed. You may want to slow down the run on fast
machines without changing the Step -- then enter an integer value other
than zero into the field Delay. Next menu, Elapsed, is used by the program
to inform you what part of the run have already elapsed. The next menu,
Trace, has two values available, Yes and No (press Enter to toggle between
them) and decides whether the evolving stars left a blue trace behind
themselves in the diagram or don't.
To run animation, press 'r', 'R', or Enter if the field Run is highlighted
(brown). You can break the animation (Esc key), or pause it by pressing a
key other than Esc, 'q' or 'Q'. In pause you can change Step or Delay and
then continue the animation from the current state with new rate. To quit
program, use Enter if the field Quit is highlighted, or simply press key
'q' or 'Q'.
Concluding remarks
StarClock 1.0 is just the first and very simple version of the program for
visualization of stellar evolution, this fascinating branch of modern
astrophysics. I am working on the version 1.1, with additional functions
(it will plot real stars in the diagram, code different phases of evolution
with different colors, show evolution of stellar radii, etc.). Of course,
reports of any bugs (programming is not my domain) or your suggestion are
welcome.
Clear screen,
Leos Ondra Brno, October 26, 1995
Skretova 6
621 00 Brno
Czech Republic
ondra@sci.muni.cz