Stellar classification says O and B stars are in OB1 associations. What then is OB2? Rursus 14:17, 20 January 2007 (UTC)[]

Possibly in reference to the Cyg OB2 association? The OB1 may come from the Per OB1 association. I.e. the number's just an index.—RJH (talk) 21:32, 10 September 2009 (UTC)[]

Hello fellow Wikipedians,

I have just modified one external link on OB star. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20060129055121/http://www.astrophysical.org/starclassification.php to http://www.astrophysical.org/starclassification.php

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

👁 check
Y An editor has reviewed this edit and fixed any errors that were found.

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 21:05, 24 January 2018 (UTC)[]