Powershell pipeline question.

Hi,

I am trying to understand how why the two bits of code return extra columns

if I execute

$a = get-process
$b = $a | select-object $_
$b

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I get the following columns displayed:

Handles  NPM(K)    PM(K)      WS(K) VM(M)   CPU(s)     Id ProcessName  

However if I want to add a custom column to the object:

The only code I can get to work is something like this.

$a = Get-Process
$b = $a | select-object @{Name="Custom1";Expression={"Test"}},*
$b

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However this outputs all of the properties. How can I pass the pipeline
from the $a and only include the default properties PSStandardMembers.

I realize I could just change the * to list the fields that I want
but I can curious to see if there another way to do what I want.

So I can understand the pipeline more.

Thanks,

Ward.