Here's what you have:

 $processor = `/aa/bin/get_bind_cpus.ksh`;
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This will leave $processor with a value like "1\n" (that's the numeral 'one', and a newline). What you want is to have a reference to a number '1'.

So I say cast $processor as a number with 0+ to get rid of the newline, and then make it a reference.

 $processor = 0+ `/aa/bin/get_bind_cpus.ksh`;
 $processor = \$processor;
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You can do this all in one step like so:

 $processor = \( 0+ `/aa/bin/get_bind_cpus.ksh` );
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Note that this means if `/aa/bin/get_bind_cpus.ksh` outputs some nonsense, that will be interpreted as zero. If you want to be prepared for that, you'll have to validate that somewhere.