How should I credit co-authors of a paper in conference proceedings I prepared myself? Suppose I've done some research as part of a (small) group, and this research has been published as a paper with all group members listed as co-authors. Then I go to give a presentation on this research at a conference, but I prepare the presentation and the writeup for the conference proceedings mostly on my own. Is it normal to list all the co-authors of the original paper as authors of the conference proceedings? If not, is there a particular way I should credit them in the proceedings, e.g. a footnote, or in the acknowledgments section?

I know the obvious answer is probably going to be that I should ask my co-authors how to credit them, and I will do that, but what I would really like to know is the most common practice, if there is one. (My field is particle physics)
The practice I'm most familiar with is that a coauthor is a coauthor is a coauthor.  Anyone listed as a coauthor on the title page of the paper should be listed on the title slide of any talk about the paper, and explicitly acknowledged ("This is joint work with...") when the talk begins.  Whether any of your coauthors helped you prepare your slides or the proceedings abstract is none of the audience's business.

But this attitude is clearly specific to my field, where papers only rarely have more than three authors.  It might not scale so well in fields (like particle physics?) where a "small" group may have 100 members.