I have worked with a professor on a project where I produced some results from running experiments and analysing the data, now the professor is asking a new student to redo my experiments with the promise of adding the student's name to the publication we already submitted to a conference and is currently under review.
I wasn't told of the reason why a new student was brought to the project but if I have to guess it would be to validate the results.
I feel that the new student shouldn't be added as an author as he is repeating what I have already done. Is my feeling correct/justified? Should I approach the professor with this concern? Or should I keep it to myself?