VIENNA – Adam Opel confirms plans to produce a convertible based on the Astra’s vehicle architecture and scheduled to hit the market in 2013.

“It follows the long-standing tradition of highly emotional and legendary Opel/Vauxhall Cabrios that provided important halo effects on our brand,” CEO Nick Reilly says in a prepared statement.

The new convertible will be produced at the General Motors plant in Gliwice, Poland, alongside other Astra models.

Gliwice currently manufactures the new, fourth-generation Astra 5-door hatchback and the previous-generation Astra 4-door sedan. It will add the new Astra 3-door hatchback, based on the Opel GTC Paris concept, this fall and a successor to the old Astra sedan in spring 2012.

The convertible’s name will be announced closer to launch, Opel says.

GM produced some 162,000 cars last year in Gliwice, up 67% from 2009. This year’s plans call for output of 172,000 units.