Blog about emailing

I’m a college student and I will be presenting a report on an article about calendar anomalies in the stock market for my oral exam. Now my question is, would it be ok if I were to email the author(s) of my journal article? I mean, they provide it in the articles but would they entertain questions about it?

I’m really tempted to do that because I have one or two questions about their methods and my exam results depends on my passing my major. However, I’m also afraid that it would be impolite… My professors aren’t exactly helpful.