OpenExoplanetCatalogue/open_exoplanet_catalogue — pull request #330 by mistertribs (2014-09-22 20:52:36+00:00)
Title: The accent in "Boötis" is a diaeresis, not an umlaut.

It does not expand to "oe", rather it marks the fact that the two vowels do not form a diphthong.