New Sidebar in Child

I have a child theme and am adding a new sidebar using the following code:

if (function_exists('register_sidebar')) {
	register_sidebar( array(
		'name' => __( 'Header Area', 'mantra' ),
		'id' => 'header-widget-area',
		'description' => __( 'top call out', 'mantra' ),
		'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
		'after_widget' => '</li>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );
}

I have inserted it into my header file like so:
<?php get_sidebar( 'header-widget-area' );?>

Clearly I’ve done this incorrectly but I just am not seeing it. Any help you can give me to wrap this up would be HUGE! Thank you!!!