Instructions and Installation


What is H-R Calc for Windows?

	Welcome to H-R Calc for Windows 2.00.   H-R Calc for Windows
	is a tool that allowsthe user to derive a star’s theoretical
	radius given it’s luminosity and spectral class (effective 
	surface temperature).  This program is designed for educators, 
	students of astronomy, amateur astronomers, and anyone wishing
	to expand their understanding of the H-R Diagram and the relationship
	between stellar luminosity, effective temperatures and stellar radii.  

	After installation, H-R Calc is fairly easy to use.  Double click the
	H-R Calc icon to launch the application.  A screen with sliders, textboxes
	and buttons appears.  The objective is to provide the application with
	two variable parameters: stellar temperature and luminosity.  To enter
	a stellar temperature you can either:

		a.  use the textbox and enter a numeric value for the effective
		    surface temperature of the star you wish to model

		b.  use the slider to choose a temperature value

		c.  click on the spectral class button and choose a spectral class

		d.  click on the star's position on the H-R Diagram

	
	To enter a luminosity you can either:

		a.  use the slider to select a luminosity value then click 
                    on the enter button

		b.  enter a numeric value in the textbox provided

		c.  enter the star's absolute visual  magnitude in the
		    textbox under the heading "absolute visual magnitude"

		e.  click on the star's position on the H-R Diagram.

	Each change made to either temperature or luminosity provides a new
	scale model where the star's radius is compared to our sun's radius.
	The "Scale Model" button is enabled for stars with radii greater than
	7 solar radii.  Pressing this button shows how large the star is in
	comparison to our solar system.    

	You may also import a star by clicking on the Import and Update Data button.


		a.  click on the "Import and Update Data" 
		b.  a listbox of actual stars is displayed
		c.  double-click on a star name or press the Apply to H-R Calc to import the
		     star into H-R Calc.

	
	That's a quick rundown on how to use H-R Calc for Windows 2.0.  For
	complete information on this application's features, please view
	the help file "HRC20.HLP"   



Installation Instructions:

     H-R Calc consists of one installation disk.  To install follow these steps:

	1.  From within Windows, run the SETUP program on Disk 1.

	2.  Follow the instructions as prompted by the Setup program.



System requirements:

	IBM Comaptible machine with 80286 processor or higher
	A hard disk with at least 2.5 MB of free space
	VGA or SVGA graphics display (SVGA Recommended)
	4 MB of RAM memory recommended
		  
	MS Windows 3.1 or later versions.


Other Info:

	Mail questions/concerns to author at the address below.
		

			David C. Irizarry
			2420 N. 202nd Place
			Box B-102
			Seattle, WA   98133
			USA

	Internet E-Mail: xerxees@ix.netcom.com
				

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H-R Calc for Windows 2.00 (C) 1995-96 by David C. Irizarry