Star Rating is a simple module that provides star rating field and display formatter using Drupal 7's Field Type API.
Unlike Fivestar module and other voting/rating module, it supports neither end user voting nor nice AJAX interface. It is inteded for the rating only by the author of the article (node). Of course, you may be able to do this with Fivestar module and other voting/rating modules, but unlike most of them, it does not require other modules such as voting API module. It's born to be simple but good enough for those who want star rating only by authors.