Query a custom post type for an author bio

<?php global $wp_query;
query_posts( array(
    'post_type' => 'articles' ,
    'author=' . $curauth ,
    'showposts' => 10 )

);   ?>

I’m trying to add the other post types to my site’s bio pages using the above code however every time I try it, I get a

able fatal error: Object of class WP_User could not be converted to string in /home/enterc/public_html/wp-content/themes/enconnected_two_desktop/author.php on line 64

Any guidance you guys could offer would be great.