Our paper in the computer science area has been accepted to a well-known conference and we are getting ready to submit our final draft. This is our first publication and I'm an undergraduate student.
The first author of this paper added 2 extra random people to the co-authors list for revising and proof checking the paper. I'm the second author and I wasn't made aware of this at all and I found it as I was getting ready to edit the paper. They didn't make a significant contribution to the content/material of the paper. Before the 2 people were added, we already had 6 people on the list: 3 students and 3 professors.
Now there are 8 authors and I'm concerned whether my work and the effort I put in will be diluted because of more authors. I don't want it to cheapen the paper. I talked to the first author and he's being stubborn that they deserve to be on the list and isn't interested in changing the list. Should I discuss it with our professors or is it not worth the time and effort? I'm interested in obtaining a PhD and I don't want the additional authors to negatively affect the way my contribution is seen by graduate schools.